Free sports calculators that just work
15 fast, accurate calculators for running, strength, cycling, and team sports. No signup, no clutter — just instant results.
🏃Running & Endurance
View all →Pace Calculator
Enter any two of distance, time, and pace — get the third instantly, plus per-km and per-mile splits.
Race Time Predictor
Enter a recent race result and target distance to estimate your finish time using the proven Riegel formula.
VO2 Max Calculator
Estimate your VO2 max from a race distance and time using the Daniels–Gilbert model.
Calories Burned Running
Estimate how many calories you burn on a run based on your weight, pace, and duration.
Heart Rate Zone Calculator
Find your five personal heart-rate training zones using your age (or measured max HR) and resting heart rate.
🏋️Strength & Fitness
View all →One Rep Max Calculator
Estimate your one-rep max from a weight you can lift for multiple reps, and get a full percentage training chart.
TDEE Calculator
Calculate the calories you burn per day (your TDEE) to set targets for cutting, maintaining, or bulking.
Macro Calculator
Turn your calorie target into daily protein, carbohydrate, and fat goals based on your objective.
Body Fat Calculator
Estimate your body-fat percentage using the U.S. Navy circumference method — just a tape measure required.
Wilks Calculator
Compare powerlifting performance across body weights by converting your total into a Wilks score.
🚴Cycling & Triathlon
View all →FTP Calculator
Estimate your Functional Threshold Power from a 20-minute test and get your full set of power training zones.
Power-to-Weight Calculator
Calculate your watts per kilogram (W/kg) — the number that best predicts climbing and racing performance.
Speed Distance Time Calculator
Enter any two of speed, distance, and time, and instantly solve for the third.