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Free Sports & Fitness Calculators

5 free sports calculators - running pace, marathon predictor, swim pace, cycling speed and VO2 max estimator. No login required.

Running Pace Calculator

Calculate running pace (min/km), speed (km/h), time and distance. Enter any two values to get the rest. Includes split tables for 5K, 10K, half marathon and full marathon.

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Marathon Time Predictor

Predict your 5K, 10K, half marathon and marathon finish time from any recent race result using Riegel's formula. Get personalised training paces for easy, tempo and interval runs.

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Swim Pace Calculator

Calculate swimming pace per 100m, total swim time or distance covered. Works for 25m and 50m pools and open water. Enter laps and pool length to get distance automatically.

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Cycling Calculator

Calculate cycling speed, time and distance. Find gear ratio, gear development (metres per pedal revolution) and speed at any cadence. Estimate calorie burn by intensity from MET values.

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VO2 Max Calculator

Estimate your VO2 max from the Cooper 12-minute run test or Rockport 1-mile walk test. See your ACSM fitness category (Poor to Superior) and five training heart rate zones.

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Sports Calculators FAQ

Running pace (min/km) = Total time in seconds / Distance in km / 60. For example, running 10 km in 55 minutes: pace = (55 x 60) / 10 / 60 = 5.5 minutes = 5:30 per km. Our running pace calculator accepts any two of distance, time, pace or speed and instantly computes the remaining values with a split table for common race distances.

The predictor uses Riegel's formula: T2 = T1 x (D2/D1)^1.06. It is accurate to within 5-10% for trained runners. Accuracy is lower for first-time marathoners who may lack the long-run training base, or when predicting from a very short known distance. Training paces (easy, tempo, interval) are also generated based on the predicted marathon time.

VO2 max is your maximum oxygen uptake - the best measure of aerobic fitness. Two field tests: (1) Cooper 12-minute run - run as far as possible in 12 minutes. VO2max = (metres - 504.9) / 44.73. (2) Rockport 1-mile walk test - walk 1 mile and record time and heart rate at finish. Our calculator handles both and shows your ACSM fitness category and training heart rate zones.

Cycling at 25 km/h is vigorous intensity with MET approximately 10.0. Calories = MET x weight (kg) x duration (hours). A 70 kg cyclist for 1 hour at 25 km/h burns approximately 700 kcal. Our cycling calculator covers light to racing pace with MET values from 4.0 to 16.0 and also includes a gear ratio calculator and speed/time/distance converter.