Health & Fitness calculators
BMI, calories, training load, and due dates — with the clinical caveats. Every tool shows its formula, updates live, and works on any device.
Saved & recent
- BMI CalculatorBody mass index in metric or imperial units, with WHO category, healthy weight range, BMI Prime, and ponderal index — the full method, shown.→
- Calorie Deficit CalculatorTurn a daily calorie deficit into a finish line: total deficit to your goal weight, days required, weekly loss rate, and the 1,200/1,500 kcal safety floors checked.→
- Diet & Body Metrics CalculatorDiet and body metrics in one calculator: Navy body fat from a tape measure, lean body mass, protein and macro targets, water intake, heart-rate zones, MET calorie burn, waist ratios, caffeine half-life, and a clearly-labeled rough BAC estimate — every formula shown with its work.→
- Health Metrics CalculatorTwelve-plus body metrics from standard published equations in one dropdown: body fat by the BMI method, frame size, Harris-Benedict and Katch-McArdle BMR, Tanaka max heart rate with zones, Karvonen target rates, Cooper 12-minute-run VO₂max, sleep-cycle bedtimes, caffeine against the 400 mg limit, steps to distance, walking calories, protein per meal, blood-pressure categories, and body surface area. Every number is an estimate with its formula shown — screening arithmetic, not medical advice.→
- Ideal Body Weight CalculatorIdeal body weight by the Devine formula with Robinson, Miller, and Hamwi compared side by side — plus the honest BMI healthy-weight range for your height.→
- Pediatric Dose CalculatorReference milligram amounts from a child’s weight: acetaminophen and ibuprofen published ranges, mg/kg orders, mg↔mL, and the classic rules — always confirm with your provider.→
- Pregnancy & Conception CalculatorConception date from LMP, due dates from LMP, conception, or IVF transfer, the fertile window, gestational age today, trimester stage, countdown, IOM weight-gain ranges, and an ovulation predictor — one dropdown for pregnancy calendar math. Estimates only: first-trimester ultrasound dating is more accurate and belongs with your provider.→
- Pregnancy Due Date CalculatorDue date from LMP, conception, or ultrasound dating — Naegele’s rule with cycle-length adjustment, plus today’s gestational age, trimester ends, and days to go.→
- TDEE CalculatorDaily calorie burn from the Mifflin-St Jeor BMR times your activity level, with cut and bulk targets, weekly maintenance, and the substituted formula shown.→
How this manual is organized
Each entry above opens a one-page tool: inputs on the left, the live result on its color board, and beneath the card the formula with worked examples and the method's limits. Save the tools you use often — they'll wait on this shelf next visit.