Fitness calculators

Training, running, and strength-program math.

Pace calculators, one-rep max estimators, and training volume tools that match how coaches actually program.

Calculators

Fitness / Running

Convert between pace, distance, and time for any run.

basic

6,665 4.6 1 min

Fitness / Running

Compute the five classic training heart-rate zones from your estimated max heart rate so you can target the right intens...

basic

1,591 4.5 1 min

Fitness / Running

Estimate your maximum heart rate using the Tanaka formula, an accurate refinement of the classic 220 − age rule.

basic

15,788 4.0 1 min

Fitness / Running

Convert running pace between minutes-per-kilometre and minutes-per-mile, plus matching speed in km/h and mph and project...

basic

19,079 4.5 1 min

Fitness / Running

Use the Karvonen formula to compute a target heart rate that respects your resting heart rate, not just your age.

basic

24,277 3.8 1 min