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Last reviewed 19 August 2026

Pace
Pace, speed, and race-distance calculators for everyday running and race-day targets.
7 calculators
Races
Predict equivalent race times, required performances, and split profiles including even, negative, and pace bands.
11 calculators
Training
Training paces estimated from a recent race using Jack Daniels VDOT.
1 calculator
Performance
Age grading, VO2 estimates, Cooper, race comparison, and marathon potential.
12 calculators
Heart
Heart-rate training zones from estimated maximum HR or heart-rate reserve.
1 calculator
Track
Lap times, standard track distances, repeats, and interval session clocks on a 400 m track.
12 calculators

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