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Last reviewed 25 August 2026

Pace
Pace, speed, and race-distance calculators for everyday running and race-day targets.
8 calculators
Races
Predict equivalent race times, required performances, and split profiles including even, negative, and pace bands.
11 calculators
Training
VDOT training paces plus weekly volume, 10% rule, long-run share, 80/20 split, and time on feet.
4 calculators
Performance
Age grading, VO2 estimates, Cooper, race comparison, flat sea-level marathon equivalents, and marathon potential.
14 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
Treadmill
Belt pace and speed, session board and chart, incline GAP, treadmill intervals, cadence, stride, and steps.
12 calculators
Hills
Hill pace, grade board, elevation gain, VAM, hill repeats, trail pace, and elevation-adjusted finish estimates.
11 calculators
Energy
Running calories, race energy, carbohydrate targets, gels, fuel timelines, and caffeine timing estimates.
4 calculators
Conditions
Heat, humidity, wind, and altitude pace adjustments, plus a race weather forecast that feeds the same models.
3 calculators
Fun
Marathon steps, one-hour distance, playlist length, elite gaps, lifetime mileage, and famous-distance equivalents.
4 calculators

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