All calculators, A–Z
Every tool in the manual — 552 calculators across 14 sections. Press / to search instead.
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A
- Absolute value |x|Math & Conversion · in Math Calculator
- Acetaminophen (Tylenol) reference doseHealth & Fitness · in Pediatric Dose Calculator
- Acres to Hectares ConverterMath & Conversion
- Add / subtract weeks, months or yearsEveryday Life · in Date & Time Calculator
- Add days to a dateEveryday Life · in Date & Time Calculator
- Age CalculatorEveryday Life
- All factors (divisors) of a numberMath & Conversion · in Math Calculator
- Angle ConverterMath & Conversion
- Annual hours from weekly hoursBusiness · in Work Schedule Calculator
- Annuity payout (drawdown)Finance · in Loan & Investing Calculator
- Any medicine — mg/kg referenceHealth & Fitness · in Pediatric Dose Calculator
- Aquarium heater wattageEveryday Life · in Pet & Aquarium Calculator
- Aquarium stocking check — 1 inch per gallonEveryday Life · in Pet & Aquarium Calculator
- Aquarium substrate — pounds neededEveryday Life · in Pet & Aquarium Calculator
- Aquarium volume — rectangle or cylinderEveryday Life · in Pet & Aquarium Calculator
- Arch — radius from rise & chordConstruction & DIY · in Trades & Shop Calculator
- Area ConverterMath & Conversion
- Arithmetic sequence — nth term & sumMath & Conversion · in Advanced Math Calculator
- Aspect Ratio CalculatorTools & Utilities
- Asset turnoverBusiness · in Business Ratios Calculator
- Atmospheres to Bar ConverterMath & Conversion
- Auto loan paymentFinance · in Loan & Investing Calculator
B
- BAC estimate (Widmark) — rough onlyHealth & Fitness · in Diet & Body Metrics Calculator
- Baker’s Percentage CalculatorFood & Cooking
- Balloon loan paymentFinance · in Loan & Investing Calculator
- Bandwidth CalculatorTechnology
- Bar to Kilopascals ConverterMath & Conversion
- Bar to Pounds/sq inch ConverterMath & Conversion
- Base converter (2–36, both directions)Math & Conversion · in Advanced Math Calculator
- Binary ↔ hex converterMath & Conversion · in Advanced Math Calculator
- Binary additionMath & Conversion · in Advanced Math Calculator
- Bitwise AND / OR / XORMath & Conversion · in Advanced Math Calculator
- Blood pressure — ACC/AHA categoryHealth & Fitness · in Health Metrics Calculator
- BMI CalculatorHealth & Fitness
- BMR — Harris-Benedict (revised)Health & Fitness · in Health Metrics Calculator
- BMR — Katch-McArdle (from lean mass)Health & Fitness · in Health Metrics Calculator
- Board feet of lumberConstruction & DIY · in Trades & Shop Calculator
- Body fat — US Navy tape methodHealth & Fitness · in Diet & Body Metrics Calculator
- Body fat % — BMI method (Deurenberg)Health & Fitness · in Health Metrics Calculator
- Body surface area — MostellerHealth & Fitness · in Health Metrics Calculator
- Bolt clearance hole sizeConstruction & DIY · in Trades & Shop Calculator
- Bond coupon paymentFinance · in Loan & Investing Calculator
- Bond current yieldFinance · in Loan & Investing Calculator
- Box (rectangular prism) — volume & surfaceEducation · in Geometry Calculator
- Boyle’s law (P₁V₁ = P₂V₂)Education · in Chemistry Calculator
- Break-Even CalculatorBusiness
- BTU to Kilowatt-hours ConverterMath & Conversion
- BTU/hour to Kilowatts ConverterMath & Conversion
- Bushels (US) to Pecks (US) ConverterMath & Conversion
- Butter ConverterMath & Conversion
C
- CAC payback periodBusiness · in Business Ratios Calculator
- Caffeine check — daily limitHealth & Fitness · in Health Metrics Calculator
- Caffeine half-lifeHealth & Fitness · in Diet & Body Metrics Calculator
- CAGR — compound annual growth rateFinance · in Loan & Investing Calculator
- Calorie Deficit CalculatorHealth & Fitness
- Calories burned — walkingHealth & Fitness · in Health Metrics Calculator
- Calories burned (MET method)Health & Fitness · in Diet & Body Metrics Calculator
- Capacitance ConverterMath & Conversion
- Capital Gains Tax CalculatorTax & Salary
- Carbon Footprint CalculatorEnvironmental
- Cartesian ↔ polar coordinatesMath & Conversion · in Advanced Math Calculator
- Cash ratioBusiness · in Business Ratios Calculator
- Cat age → human yearsEveryday Life · in Pet Care Calculator
- Cat daily calories — RER × factorEveryday Life · in Pet Care Calculator
- Cat medication dose by weight — conservative referenceEveryday Life · in Pet Care Calculator
- CD / fixed deposit maturityFinance · in Loan & Investing Calculator
- Celsius to Fahrenheit ConverterMath & Conversion
- Celsius to Kelvin ConverterMath & Conversion
- Centimeters to Feet ConverterMath & Conversion
- Centimeters to Inches ConverterMath & Conversion
- Centripetal force — F = mv²/rEducation · in Physics Calculator
- Charles’s law (V₁/T₁ = V₂/T₂)Education · in Chemistry Calculator
- Chicken coop & run sizeEveryday Life · in Pet & Aquarium Calculator
- Chicken feed — per day, week, monthEveryday Life · in Pet & Aquarium Calculator
- Churn rateBusiness · in Business Ratios Calculator
- Circle — area & circumferenceEducation · in Geometry Calculator
- Circle — area from diameterEducation · in Geometry Calculator
- Circle sector — arc length & areaEducation · in Geometry Calculator
- Click-through rate (CTR)Business · in Business Ratios Calculator
- Coefficient of variationEducation · in Statistics Calculator
- Coin & card probabilitySports · in Sports & Games Calculator
- Combinations nCrMath & Conversion · in Math Calculator
- Combined gas law (P₁V₁/T₁ = P₂V₂/T₂)Education · in Chemistry Calculator
- Complex number — magnitude & conjugateMath & Conversion · in Advanced Math Calculator
- Complex numbers — add, subtract, multiply, divideMath & Conversion · in Advanced Math Calculator
- Compound Interest CalculatorFinance
- Concentration in ppmEducation · in Chemistry Calculator
- Conception / fertile windowHealth & Fitness · in Pregnancy & Conception Calculator
- Conception date from LMPHealth & Fitness · in Pregnancy & Conception Calculator
- Concrete CalculatorConstruction & DIY
- Cone — volume, slant, surfaceEducation · in Geometry Calculator
- Confidence interval for the meanEducation · in Statistics Calculator
- Contribution margin (price − variable cost)Business · in Business Ratios Calculator
- Conversion rateBusiness · in Business Ratios Calculator
- Cooking Measurement ConverterFood & Cooking
- Correlation coefficient (r)Education · in Statistics Calculator
- Cost of Meeting CalculatorTools & Utilities
- Countdown to the due dateHealth & Fitness · in Pregnancy & Conception Calculator
- Countertop — square feet + 10%Construction & DIY · in Home Project Materials Calculator
- CPC → CPM conversionBusiness · in Business Ratios Calculator
- Credit card payoffFinance · in Loan & Investing Calculator
- Cumulative GPA CalculatorEducation
- Cups (US) to Fluid ounces (US) ConverterMath & Conversion
- Cups (US) to Milliliters ConverterMath & Conversion
- Cups to Grams ConverterMath & Conversion
- Current ratio & working capitalBusiness · in Business Ratios Calculator
- Curve — flat bonusEducation · in Test Score Calculator
- Curve — square-root scalingEducation · in Test Score Calculator
- Customer lifetime value (LTV)Business · in Business Ratios Calculator
- Cylinder — volume & surface areaEducation · in Geometry Calculator
D
- Daily fiber target (IOM)Health & Fitness · in Diet & Body Metrics Calculator
- Daily protein targetHealth & Fitness · in Diet & Body Metrics Calculator
- Daily water intakeHealth & Fitness · in Diet & Body Metrics Calculator
- Data Storage ConverterMath & Conversion
- Day of the week for any dateEveryday Life · in Date & Time Calculator
- Day of year (1–366)Everyday Life · in Date & Time Calculator
- Days Between Dates CalculatorEveryday Life
- Days since a dateEveryday Life · in Date & Time Calculator
- Days until a date (countdown)Everyday Life · in Date & Time Calculator
- Debt payoff timelineFinance · in Everyday Money Calculator
- Debt-to-assetsBusiness · in Business Ratios Calculator
- Debt-to-equity & equity multiplierBusiness · in Business Ratios Calculator
- Debt-to-income ratioFinance · in Everyday Money Calculator
- Decimal → Roman numeralsMath & Conversion · in Advanced Math Calculator
- Decimal to fraction converterMath & Conversion · in Math Calculator
- Deck — decking boardsConstruction & DIY · in Home Project Materials Calculator
- Defensive interval (cash ÷ daily spend)Business · in Business Ratios Calculator
- Degrees to Radians ConverterMath & Conversion
- Density — ρ = m/VEducation · in Physics Calculator
- Density ConverterMath & Conversion
- Dice probability & rollerSports · in Sports & Games Calculator
- Digit sum & digital rootMath & Conversion · in Number Systems Calculator
- Dilution (C₁V₁ = C₂V₂)Education · in Chemistry Calculator
- Discount CalculatorMath & Conversion
- Distance from point to line (Ax + By + C = 0)Math & Conversion · in Advanced Math Calculator
- Distance, midpoint & slope between 2 pointsEducation · in Geometry Calculator
- Dividend payout ratioBusiness · in Business Ratios Calculator
- Dividend yieldFinance · in Loan & Investing Calculator
- Dog age → human yearsEveryday Life · in Pet Care Calculator
- Dog crate size — add 2–4 inchesEveryday Life · in Pet & Aquarium Calculator
- Dog daily calories — RER × factorEveryday Life · in Pet Care Calculator
- Dog daily water intakeEveryday Life · in Pet Care Calculator
- Dog medication dose by weight — diphenhydramine referenceEveryday Life · in Pet Care Calculator
- Dog walk time — by breed groupEveryday Life · in Pet & Aquarium Calculator
- Down payment ↔ percentageFinance · in Loan & Investing Calculator
- Download Time CalculatorTechnology
- Dry quarts (US) to Liters ConverterMath & Conversion
- Drywall — 4×8 sheets for a roomConstruction & DIY · in Home Project Materials Calculator
- Due date from conception dateHealth & Fitness · in Pregnancy & Conception Calculator
- Due date from IVF transfer dateHealth & Fitness · in Pregnancy & Conception Calculator
- Due date from LMP (Naegele, cycle-adjusted)Health & Fitness · in Pregnancy & Conception Calculator
- Dunk reach calculatorSports · in Sports & Games Calculator
E
- EBITDA & EBITBusiness · in Business Ratios Calculator
- Eggs per week — by breedEveryday Life · in Pet & Aquarium Calculator
- Electrical power — P = VIEducation · in Physics Calculator
- Ellipse — areaEducation · in Geometry Calculator
- EMI (equated monthly installment)Finance · in Loan & Investing Calculator
- Employee Cost CalculatorBusiness
- Energy ConverterMath & Conversion
- EV & EV/EBITDA multipleBusiness · in Business Ratios Calculator
- Exponent / power aᵇMath & Conversion · in Math Calculator
F
- Factorial n! (and double factorial n!!)Math & Conversion · in Math Calculator
- Fahrenheit to Celsius ConverterMath & Conversion
- Fahrenheit to Kelvin ConverterMath & Conversion
- Farads to Microfarads ConverterMath & Conversion
- Federal Income Tax CalculatorTax & Salary
- Feet to Centimeters ConverterMath & Conversion
- Feet to Meters ConverterMath & Conversion
- Fence — pickets and postsConstruction & DIY · in Home Project Materials Calculator
- Fibonacci — nth term & sequenceMath & Conversion · in Advanced Math Calculator
- Field goal / shooting percentageSports · in Sports & Games Calculator
- Final Grade CalculatorEducation
- Flooring — boxes of plank or tileConstruction & DIY · in Home Project Materials Calculator
- Flow Rate ConverterMath & Conversion
- Fluid ounces (US) to Milliliters ConverterMath & Conversion
- Force ConverterMath & Conversion
- Fraction CalculatorMath & Conversion
- Frame size — height ÷ wristHealth & Fitness · in Health Metrics Calculator
- Free fall — time & impact speedEducation · in Physics Calculator
- Frequency ConverterMath & Conversion
- ft³/min to L/s ConverterMath & Conversion
- FTE from weekly hoursBusiness · in Work Schedule Calculator
- Fuel Cost CalculatorEveryday Life
- Fuel Economy Comparison CalculatorAutomotive
- Fuel Economy ConverterMath & Conversion
- Future value of an annuityFinance · in Loan & Investing Calculator
G
- g/cm³ to kg/m³ ConverterMath & Conversion
- g/cm³ to lb/ft³ ConverterMath & Conversion
- Gallons (imperial) to Liters ConverterMath & Conversion
- Gallons (US) to Liters ConverterMath & Conversion
- Gallons/min (US) to L/min ConverterMath & Conversion
- GCD — greatest common divisor (2–3 numbers)Math & Conversion · in Math Calculator
- Gematria (Hebrew numerology)Tools & Utilities · in Text & Word Calculator
- Geometric sequence — nth term & sumMath & Conversion · in Advanced Math Calculator
- Gestational age todayHealth & Fitness · in Pregnancy & Conception Calculator
- Gibibytes to Gigabytes ConverterMath & Conversion
- Gigabytes to Gibibytes ConverterMath & Conversion
- Gigabytes to Mebibytes ConverterMath & Conversion
- Gigabytes to Terabytes ConverterMath & Conversion
- Gigahertz to Megahertz ConverterMath & Conversion
- Golf Handicap CalculatorSports
- GPA CalculatorEducation
- Gradians to Degrees ConverterMath & Conversion
- Grams to Ounces ConverterMath & Conversion
- Grass seed — pounds for your lawnConstruction & DIY · in Home Project Materials Calculator
- Gravel — tons from area and depthConstruction & DIY · in Home Project Materials Calculator
- Gravitational PE — PE = mghEducation · in Physics Calculator
- Gross Margin CalculatorBusiness
H
- Hay per day — % of body weightEveryday Life · in Pet & Aquarium Calculator
- Heart rate zonesHealth & Fitness · in Diet & Body Metrics Calculator
- Hectares to Acres ConverterMath & Conversion
- Henries to Millihenries ConverterMath & Conversion
- Hertz to Revolutions/min ConverterMath & Conversion
- Home affordability (28/36 rule)Finance · in Loan & Investing Calculator
- Home Energy Audit CalculatorEnvironmental
- Hooke’s law — F = kxEducation · in Physics Calculator
- Horsepower (mech) to Horsepower (metric) ConverterMath & Conversion
- Horsepower (mech) to Kilowatts ConverterMath & Conversion
- Hourly to Salary CalculatorTax & Salary
- Hours worked (time card)Everyday Life · in Date & Time Calculator
- Hydrostatic pressure — P = ρghEducation · in Physics Calculator
I
- Ibuprofen (Advil/Motrin) reference doseHealth & Fitness · in Pediatric Dose Calculator
- Ideal Body Weight CalculatorHealth & Fitness
- Ideal gas law (PV = nRT)Education · in Chemistry Calculator
- Illuminance ConverterMath & Conversion
- Impulse — J = FΔt = ΔpEducation · in Physics Calculator
- Inches to Centimeters ConverterMath & Conversion
- Inches to Millimeters ConverterMath & Conversion
- Inductance ConverterMath & Conversion
- Infinite geometric series — sumMath & Conversion · in Advanced Math Calculator
- Inflation adjustment (CPI-based)Finance · in Everyday Money Calculator
- Inflation-adjusted (real) returnFinance · in Loan & Investing Calculator
- Insulation — rolls or battsConstruction & DIY · in Home Project Materials Calculator
- Interest coverage (EBIT ÷ interest)Business · in Business Ratios Calculator
- Interest-only paymentFinance · in Loan & Investing Calculator
- Inventory turnover & DIOBusiness · in Business Ratios Calculator
- IP Subnet CalculatorTechnology
- IRR — internal rate of returnFinance · in Loan & Investing Calculator
K
- Kelvin to Celsius ConverterMath & Conversion
- Kelvin to Fahrenheit ConverterMath & Conversion
- kg/m³ to g/cm³ ConverterMath & Conversion
- kg/m³ to lb/ft³ ConverterMath & Conversion
- Kilobytes to Kibibytes ConverterMath & Conversion
- Kilocalories to Kilojoules ConverterMath & Conversion
- Kilogram-force meters to Pound-feet ConverterMath & Conversion
- Kilogram-force to Newtons ConverterMath & Conversion
- Kilograms to Pounds ConverterMath & Conversion
- Kilograms to Stones ConverterMath & Conversion
- Kilohertz to Megahertz ConverterMath & Conversion
- Kilojoules to Kilocalories ConverterMath & Conversion
- Kilometers to Miles ConverterMath & Conversion
- Kilometers/hour to Miles/hour ConverterMath & Conversion
- Kilonewtons to Pounds-force ConverterMath & Conversion
- Kilopascals to Pounds/sq inch ConverterMath & Conversion
- Kilowatt-hours to Kilojoules ConverterMath & Conversion
- Kilowatts to BTU/hour ConverterMath & Conversion
- Kilowatts to Horsepower (mech) ConverterMath & Conversion
- Kinematics — displacement s = ut + ½at²Education · in Physics Calculator
- Kinematics — final velocity v = u + atEducation · in Physics Calculator
- Kinematics — v² = u² + 2as (no time)Education · in Physics Calculator
- Kinetic energy — KE = ½mv²Education · in Physics Calculator
- Knots to Kilometers/hour ConverterMath & Conversion
- Knots to Miles/hour ConverterMath & Conversion
L
- L/min to ft³/min ConverterMath & Conversion
- L/min to Gallons/min (US) ConverterMath & Conversion
- Law of cosines — missing sideMath & Conversion · in Advanced Math Calculator
- Law of sines — missing sideMath & Conversion · in Advanced Math Calculator
- lb/ft³ to kg/m³ ConverterMath & Conversion
- lb/ft³ to lb/in³ ConverterMath & Conversion
- LCM — least common multiple (2–3 numbers)Math & Conversion · in Math Calculator
- Lean body mass (Boer formula)Health & Fitness · in Diet & Body Metrics Calculator
- Lean body mass (from body fat %)Health & Fitness · in Diet & Body Metrics Calculator
- Leap year checkerEveryday Life · in Date & Time Calculator
- Lease vs Buy CalculatorAutomotive
- Leet speak converterTools & Utilities · in Text & Word Calculator
- Length ConverterMath & Conversion
- Letter case converterTools & Utilities · in Text & Word Calculator
- Letter frequencyTools & Utilities · in Text & Word Calculator
- Limiting reactant (2 reactants)Education · in Chemistry Calculator
- Line from two points — slope, intercept, angleMath & Conversion · in Advanced Math Calculator
- Linear equation solver (ax + b = c)Math & Conversion · in Math Calculator
- Linear regression (slope & intercept)Education · in Statistics Calculator
- Liters per 100 km to Miles per gallon (US) ConverterMath & Conversion
- Liters to Gallons (imperial) ConverterMath & Conversion
- Liters to Gallons (US) ConverterMath & Conversion
- Litter boxes — cats + 1Everyday Life · in Pet & Aquarium Calculator
- Loan Amortization CalculatorFinance
- Loan comparison (two offers)Finance · in Loan & Investing Calculator
- Loan payment (amortized)Finance · in Loan & Investing Calculator
- Logarithm (base 2, e, 10 or custom)Math & Conversion · in Math Calculator
- Long division stepsMath & Conversion · in Number Systems Calculator
- Lottery odds (choose N of M)Sports · in Sports & Games Calculator
- Lump sum future valueFinance · in Loan & Investing Calculator
- Lux to Foot-candles ConverterMath & Conversion
M
- m³/hour to Gallons/min (US) ConverterMath & Conversion
- Macro split — calories to gramsHealth & Fitness · in Diet & Body Metrics Calculator
- Marathon Pace CalculatorSports
- Margin of error (95% / 99%)Education · in Statistics Calculator
- Marketing ROI CalculatorBusiness
- Markup vs margin (pair)Business · in Business Ratios Calculator
- Mass from moles (m = n×M)Education · in Chemistry Calculator
- Matrix determinant (2×2 or 3×3)Math & Conversion · in Advanced Math Calculator
- Matrix inverse (2×2)Math & Conversion · in Advanced Math Calculator
- Matrix multiplication (2×2 or 3×3)Math & Conversion · in Advanced Math Calculator
- Matrix transpose (up to 4×4)Math & Conversion · in Advanced Math Calculator
- Max heart rate — Tanaka + zonesHealth & Fitness · in Health Metrics Calculator
- Mean, median, mode & rangeEducation · in Statistics Calculator
- Mean, median, mode & range of a listMath & Conversion · in Math Calculator
- Mebibytes to Gigabytes ConverterMath & Conversion
- Mebibytes to Megabytes ConverterMath & Conversion
- Megabytes to Mebibytes ConverterMath & Conversion
- Megahertz to Gigahertz ConverterMath & Conversion
- Meters to Feet ConverterMath & Conversion
- Meters to Yards ConverterMath & Conversion
- Meters/second to Miles/hour ConverterMath & Conversion
- Metric tons to US tons ConverterMath & Conversion
- mg ↔ mL by concentrationHealth & Fitness · in Pediatric Dose Calculator
- Microfarads to Millifarads ConverterMath & Conversion
- Microfarads to Nanofarads ConverterMath & Conversion
- Microhenries to Nanohenries ConverterMath & Conversion
- Miles per gallon (US) to Liters per 100 km ConverterMath & Conversion
- Miles to Kilometers ConverterMath & Conversion
- Miles/hour to Kilometers/hour ConverterMath & Conversion
- Miles/hour to Meters/second ConverterMath & Conversion
- Millihenries to Microhenries ConverterMath & Conversion
- Milliliters to Cups (US) ConverterMath & Conversion
- Milliliters to Fluid ounces (US) ConverterMath & Conversion
- Millimeters to Inches ConverterMath & Conversion
- Minutes ↔ hours conversionEveryday Life · in Date & Time Calculator
- mL/s to L/min ConverterMath & Conversion
- Modulo (remainder)Math & Conversion · in Math Calculator
- Molarity (M = n/V)Education · in Chemistry Calculator
- Moles from mass (n = m/M)Education · in Chemistry Calculator
- Moles from molarity (n = M×V)Education · in Chemistry Calculator
- Momentum — p = mvEducation · in Physics Calculator
- Mortgage CalculatorFinance
- Mulch CalculatorConstruction & DIY
N
- Nanofarads to Picofarads ConverterMath & Conversion
- Net profit marginBusiness · in Business Ratios Calculator
- Net work days per year (holidays + PTO)Business · in Work Schedule Calculator
- Newton-meters to Pound-feet ConverterMath & Conversion
- Newton-meters to Pound-inches ConverterMath & Conversion
- Newton’s second law — F = maEducation · in Physics Calculator
- Newtons to Kilogram-force ConverterMath & Conversion
- Newtons to Pounds-force ConverterMath & Conversion
- NFL passer ratingSports · in Sports & Games Calculator
- Normal range within k sigmaEducation · in Statistics Calculator
- NPV — net present valueFinance · in Loan & Investing Calculator
- Number to wordsMath & Conversion · in Number Systems Calculator
O
- Ohm’s law — V = IREducation · in Physics Calculator
- Oil to Gas Ratio CalculatorAutomotive
- One Rep Max CalculatorSports
- Operating margin (EBIT ÷ revenue)Business · in Business Ratios Calculator
- Ordinal generatorMath & Conversion · in Number Systems Calculator
- Ounces to Grams ConverterMath & Conversion
- Ounces to Pounds ConverterMath & Conversion
- Overtime Paycheck CalculatorTax & Salary
- Ovulation predictorHealth & Fitness · in Pregnancy & Conception Calculator
P
- P/B ratioBusiness · in Business Ratios Calculator
- P/E ratioBusiness · in Business Ratios Calculator
- P/E ratioFinance · in Loan & Investing Calculator
- Paid hours after unpaid breaksBusiness · in Work Schedule Calculator
- Paint — gallons for a roomConstruction & DIY · in Home Project Materials Calculator
- Palindrome checkerTools & Utilities · in Text & Word Calculator
- Parallel resistance — 1/R = 1/R₁ + 1/R₂ + ...Education · in Physics Calculator
- Particles from moles (N = n×NA)Education · in Chemistry Calculator
- Password Entropy CalculatorTools & Utilities
- Payables turnover & DPOBusiness · in Business Ratios Calculator
- Payback periodFinance · in Loan & Investing Calculator
- Pecks (US) to Dry quarts (US) ConverterMath & Conversion
- Pendulum period — T = 2π√(L/g)Education · in Physics Calculator
- Percent composition of an elementEducation · in Chemistry Calculator
- Percent yieldEducation · in Chemistry Calculator
- Percentage CalculatorMath & Conversion
- Percentile rankEducation · in Statistics Calculator
- Permutations nPrMath & Conversion · in Math Calculator
- Pet food portion — kcal/cup → cups per dayEveryday Life · in Pet Care Calculator
- pH from [H⁺]Education · in Chemistry Calculator
- Phots to Lux ConverterMath & Conversion
- Picas to Points ConverterMath & Conversion
- Pints (US) to Milliliters ConverterMath & Conversion
- Pipe rolling offsetConstruction & DIY · in Trades & Shop Calculator
- Pipe volume & fill timeConstruction & DIY · in Trades & Shop Calculator
- Pixels to Points ConverterMath & Conversion
- Pizza Dough CalculatorFood & Cooking
- pOH and the Kw relationEducation · in Chemistry Calculator
- Points to Inches ConverterMath & Conversion
- Points to Pixels ConverterMath & Conversion
- Population standard deviation (σ)Education · in Statistics Calculator
- Pound-feet to Kilogram-force meters ConverterMath & Conversion
- Pound-feet to Newton-meters ConverterMath & Conversion
- Pound-inches to Newton-meters ConverterMath & Conversion
- Pounds to Kilograms ConverterMath & Conversion
- Pounds to Ounces ConverterMath & Conversion
- Pounds-force to Newtons ConverterMath & Conversion
- Pounds-force to Ounces-force ConverterMath & Conversion
- Pounds/sq inch to Bar ConverterMath & Conversion
- Pounds/sq inch to Kilopascals ConverterMath & Conversion
- Power — P = W/tEducation · in Physics Calculator
- Power ConverterMath & Conversion
- Pregnancy Due Date CalculatorHealth & Fitness
- Present value of an annuityFinance · in Loan & Investing Calculator
- Pressure — P = F/AEducation · in Physics Calculator
- Pressure ConverterMath & Conversion
- Prime factorizationMath & Conversion · in Math Calculator
- Prime number checkerMath & Conversion · in Math Calculator
- Primer — gallons for a roomConstruction & DIY · in Home Project Materials Calculator
- Projectile — range, height & flight timeEducation · in Physics Calculator
- Proportion solver (a/b = c/x)Math & Conversion · in Math Calculator
- Prorated rentFinance · in Everyday Money Calculator
- Prorated salary for a partial periodBusiness · in Work Schedule Calculator
- Protein per meal — 0.4 g/kgHealth & Fitness · in Health Metrics Calculator
- PTO accrual balanceBusiness · in Work Schedule Calculator
- Pyramid — volume (square base)Education · in Geometry Calculator
Q
R
- Radians to Degrees ConverterMath & Conversion
- Rafter lengthConstruction & DIY · in Trades & Shop Calculator
- Ratio simplifier (a : b)Math & Conversion · in Math Calculator
- Receivables turnover & DSOBusiness · in Business Ratios Calculator
- Rectangle — area, perimeter, diagonalEducation · in Geometry Calculator
- Refinance break-evenFinance · in Loan & Investing Calculator
- Regular polygon — area & perimeterEducation · in Geometry Calculator
- Rent split by incomeFinance · in Everyday Money Calculator
- Residual incomeBusiness · in Business Ratios Calculator
- Retirement countdown (year + age)Business · in Work Schedule Calculator
- Retirement Savings CalculatorFinance
- Return on assets (ROA)Business · in Business Ratios Calculator
- Return on equity (ROE)Business · in Business Ratios Calculator
- Reverse digits & palindrome checkMath & Conversion · in Number Systems Calculator
- Reverse text & wordsTools & Utilities · in Text & Word Calculator
- Revolutions/min to Hertz ConverterMath & Conversion
- Revolutions/min to Radians/sec ConverterMath & Conversion
- Right triangle — hypotenuse & legsEducation · in Geometry Calculator
- ROI (with annualized view)Finance · in Loan & Investing Calculator
- ROIC (NOPAT ÷ invested capital)Business · in Business Ratios Calculator
- Roman numerals → decimalMath & Conversion · in Advanced Math Calculator
- Roman numerals ↔ decimalMath & Conversion · in Number Systems Calculator
- Roof pitch — angle, multiplier, gradeConstruction & DIY · in Trades & Shop Calculator
- Roofing CalculatorConstruction & DIY
- Rotating 12-hour shift pattern (D/N/O)Business · in Work Schedule Calculator
- Rounding & significant figuresMath & Conversion · in Math Calculator
- Rule of 72 (and 115)Finance · in Loan & Investing Calculator
- Running Pace CalculatorSports
S
- Sample size for a proportionEducation · in Statistics Calculator
- Sample standard deviation (s)Education · in Statistics Calculator
- Savings Goal CalculatorFinance
- Scientific notation converterMath & Conversion · in Math Calculator
- Series resistance — R₁ + R₂ + R₃Education · in Physics Calculator
- Server Power CalculatorTechnology
- Shift differential pay (night / weekend %)Business · in Work Schedule Calculator
- Siding — squares and boxesConstruction & DIY · in Home Project Materials Calculator
- Simple vs compound interestFinance · in Everyday Money Calculator
- Sleep cycles — when to go to bedHealth & Fitness · in Health Metrics Calculator
- Snow load from depth & densityConstruction & DIY · in Trades & Shop Calculator
- Sod — rolls and palletsConstruction & DIY · in Home Project Materials Calculator
- Solar Panel Savings CalculatorEnvironmental
- Sourdough Starter CalculatorFood & Cooking
- Specific heat — Q = mcΔTEducation · in Physics Calculator
- Speed ConverterMath & Conversion
- Sphere — volume & surface areaEducation · in Geometry Calculator
- Spring PE — ½kx²Education · in Physics Calculator
- Square feet to Acres ConverterMath & Conversion
- Square feet to Square meters ConverterMath & Conversion
- Square Footage CalculatorConstruction & DIY
- Square inches to Square centimeters ConverterMath & Conversion
- Square kilometers to Square miles ConverterMath & Conversion
- Square meters to Acres ConverterMath & Conversion
- Square meters to Square feet ConverterMath & Conversion
- Square miles to Square kilometers ConverterMath & Conversion
- Square root & nth rootMath & Conversion · in Math Calculator
- Square yards to Square meters ConverterMath & Conversion
- Stairs — risers, treads, stringerConstruction & DIY · in Trades & Shop Calculator
- Standard error of the meanEducation · in Statistics Calculator
- State Paycheck CalculatorTax & Salary
- Steps → distanceHealth & Fitness · in Health Metrics Calculator
- Sticks to Grams ConverterMath & Conversion
- Sticks to Tablespoons ConverterMath & Conversion
- Stock average price (multiple lots)Finance · in Loan & Investing Calculator
- Stones to Kilograms ConverterMath & Conversion
- Subtract days from a dateEveryday Life · in Date & Time Calculator
- Sum & count of a listEducation · in Statistics Calculator
T
- Tablespoons (US) to Milliliters ConverterMath & Conversion
- Tablespoons to Grams ConverterMath & Conversion
- Target heart rate — Karvonen (HRR)Health & Fitness · in Health Metrics Calculator
- TDEE CalculatorHealth & Fitness
- Teaspoons (US) to Milliliters ConverterMath & Conversion
- Temperature ConverterMath & Conversion
- Terabytes to Gigabytes ConverterMath & Conversion
- Terrarium size — by speciesEveryday Life · in Pet & Aquarium Calculator
- Test average from a listEducation · in Test Score Calculator
- Test percentage & letter gradeEducation · in Test Score Calculator
- Tile — pieces plus 10% wasteConstruction & DIY · in Home Project Materials Calculator
- Time between two clock timesEveryday Life · in Date & Time Calculator
- Time ConverterMath & Conversion
- Time Saved CalculatorTools & Utilities
- Time to Decimal CalculatorEveryday Life
- Time-zone meeting planner (UTC offsets)Business · in Work Schedule Calculator
- Tip CalculatorEveryday Life
- Torque — τ = rF sin θEducation · in Physics Calculator
- Torque ConverterMath & Conversion
- Trapezoid — areaEducation · in Geometry Calculator
- Triangle — area (base × height)Education · in Geometry Calculator
- Triangle — area from 3 coordinatesMath & Conversion · in Advanced Math Calculator
- Triangle — area from 3 sides (Heron)Education · in Geometry Calculator
- Triangle — ASA / AAS (two angles + a side)Math & Conversion · in Advanced Math Calculator
- Triangle — SAS (two sides + included angle)Math & Conversion · in Advanced Math Calculator
- Triangle — SSS (three sides → angles)Math & Conversion · in Advanced Math Calculator
- Triangular number n(n+1)/2Math & Conversion · in Advanced Math Calculator
- Trigonometry CalculatorMath & Conversion
- Trimester stage todayHealth & Fitness · in Pregnancy & Conception Calculator
- True Cost to Own CalculatorAutomotive
- Turns to Degrees ConverterMath & Conversion
- Two’s complement (2–64 bits)Math & Conversion · in Advanced Math Calculator
- Typography ConverterMath & Conversion
U
V
- Vacation days a trip will costBusiness · in Work Schedule Calculator
- Variance (population & sample)Education · in Statistics Calculator
- Vector — magnitude, direction & unit vectorMath & Conversion · in Advanced Math Calculator
- Vectors — cross product (3D)Math & Conversion · in Advanced Math Calculator
- Vectors — dot product & angle betweenMath & Conversion · in Advanced Math Calculator
- VO₂ max — Cooper 12-minute runHealth & Fitness · in Health Metrics Calculator
- Volume (Dry) ConverterMath & Conversion
- Volume ConverterMath & Conversion
W
- Waist-to-height ratioHealth & Fitness · in Diet & Body Metrics Calculator
- Waist-to-hip ratioHealth & Fitness · in Diet & Body Metrics Calculator
- Wallpaper — rolls at 56 sq ftConstruction & DIY · in Home Project Materials Calculator
- Water Usage CalculatorEnvironmental
- Watt-hours to Kilojoules ConverterMath & Conversion
- Watts to Horsepower (mech) ConverterMath & Conversion
- Wave speed — v = fλEducation · in Physics Calculator
- Week number (ISO 8601)Everyday Life · in Date & Time Calculator
- Weekend days between two datesBusiness · in Work Schedule Calculator
- Weekly overtime payBusiness · in Work Schedule Calculator
- Weight & Mass ConverterMath & Conversion
- Weight from mass — W = mgEducation · in Physics Calculator
- Weight gain range by pre-pregnancy BMIHealth & Fitness · in Pregnancy & Conception Calculator
- Weighted averageMath & Conversion · in Math Calculator
- Weighted category gradeEducation · in Test Score Calculator
- Weighted Grade CalculatorEducation
- Win percentage & magic numberSports · in Sports & Games Calculator
- Word & character countTools & Utilities · in Text & Word Calculator
- Words to numberMath & Conversion · in Number Systems Calculator
- Work — W = Fd cos θEducation · in Physics Calculator
- Work anniversary & next milestoneBusiness · in Work Schedule Calculator
- Work days between two dates (Mon–Fri)Everyday Life · in Date & Time Calculator
- Work days until a date (from today)Business · in Work Schedule Calculator