Sports calculators
Pace, splits, handicaps, and one-rep-max estimates. Every tool shows its formula, updates live, and works on any device.
Saved & recent
- Golf Handicap CalculatorWorld Handicap System index from your recent scores, course ratings, and slopes — per-round differentials, best-of counting, and the formula shown.→
- Marathon Pace CalculatorGoal time to per-km and per-mile pace with even-split checkpoints every 5 km, halfway split, and speed in km/h and mph — the race plan on one board.→
- One Rep Max CalculatorEstimated one-rep max from a weight and 1-12 reps using the Epley, Brzycki, and Lombardi formulas, with a percentage loading table for training.→
- Running Pace CalculatorRunning pace in min/km and min/mile from any distance and time, with speeds, a 400 m lap split, and projected finish times from 5K to marathon.→
- Sports & Games CalculatorNFL passer rating, win percentage and magic numbers, dice and lottery odds, shooting percentages, dunk reach, and card probability — the real formulas sports and games run on.→
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.