CCalculate.Studio

Fitness

Training calculators for runners, cyclists, swimmers and lifters — validated formulas from sports science literature.

Running

2 free calculators →
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Running Pace Calculator

Calculate your running pace per kilometre and per mile from any distance and finish time, plus average speed and even 5K and 10K split times.

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Marathon Time Predictor

Predict your marathon, half marathon, 10K and 5K times from a recent race result using the Riegel formula T2 = T1 × (D2/D1)^1.06. Free and instant.

Cycling

1 free calculators →
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Cycling Power Calculator

Estimate the power in watts needed to ride at a given speed from rider weight, bike weight and road gradient, using a standard physics model. Plus W/kg.

Swimming

1 free calculators →
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Swimming Pace Calculator

Calculate your swimming pace per 100 m and per 100 yd from any distance and time, plus average speed and a projected 1500 m time. Free and instant.

Strength

1 free calculators →
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1RM Calculator

Estimate your one-rep max from a submaximal set using the Epley, Brzycki, Lombardi and Mayhew formulas, with 90/80/70% training-load percentages.

Cardio & Energy

3 free calculators →
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TDEE Calculator

Calculate your Total Daily Energy Expenditure with the Mifflin-St Jeor equation and standard activity multipliers. Maintenance, loss and gain estimates.

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VO2 Max Calculator

Estimate your VO2 max from the Cooper 12-minute run test and compare it with Cooper Institute fitness norms by age and sex. Free and instant.

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Calories Burned Calculator

Estimate calories burned for 24 activities using MET values from the 2011 Compendium of Physical Activities. By body weight and duration, free and instant.