Tools for cyclists and runners

Free calculators to understand climbs, work out pace and race times, and find your heart rate zones. No sign-up needed.

Gradient and VAM calculator

Calculate a climb's average gradient from distance and elevation gain, and your VAM (average ascent speed) from gain and time. Free, no sign-up.

Watts/kg and climb time calculator

Calculate your watts per kilo from FTP and weight, and estimate how long a climb takes at constant power. Free tool for cyclists.

Gear ratio and speed calculator

Calculate speed from chainring, cog, cadence and wheel size, plus the metres of development per pedal stroke. Helps you choose the right cassette.

Running pace calculator

Calculate your running pace in min/km and speed in km/h from distance and time. See instantly which pace you need for a 10K, half marathon or marathon goal.

Race time predictor (5K, 10K, half, marathon)

Predict your 5K, 10K, half marathon and marathon times from a recent race. Riegel formula, free and no sign-up.

Heart rate zone calculator

Calculate your 5 heart rate training zones from max and resting heart rate (Karvonen method). Train in zone 2, threshold and VO2max for running and cycling.