CodeASystem calculators

Fitness & Sports calculators

Fitness & Sports7

Fitness and sports calculators for running pace, race predictions, one-rep maxes, target heart rate and calorie burn.

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7 tools

Estimate your one-repetition max from any set of 1–12 reps, with Epley as the primary formula and Brzycki for comparison.

Convert a distance and duration into running pace in min/km or min/mile, with average speed in km/h alongside.

Predict finish times at new race distances from a recent result using the Riegel formula; from 5K through the marathon.

Estimate exercise energy expenditure from activity MET values, body weight and duration using the Compendium of Physical Activities.

Compute Karvonen training zones from your age and resting heart rate, with HRmax estimated by the Tanaka equation.

Estimate VO₂max from a Cooper 12-minute run test, with approximate fitness bands for interpreting the result.

Convert daily steps into distance walked and rough calories burned using stride length and body weight, documented as an approximation.