Tools

Running calculators.

The most useful numbers in distance running — pace, zones, race predictions — without the noise.

Pace

Running Pace Calculator

Calculate your pace, predict race times, and view kilometre and mile splits.

Heart Rate Zone Calculator

Calculate your five heart-rate zones using the Karvonen heart-rate-reserve method.

Race Time Predictor

Predict your time over any race distance from one recent result.

Marathon Pace Calculator

Coming soon

VO₂ Max Calculator (Cooper Test)

Estimate your VO₂ max from a 12-minute Cooper test or a 1.5-mile run.

Long Run Calculator

Coming soon

Training Load Calculator

Coming soon

Cadence Calculator

Coming soon

Fuel Calculator

Coming soon

Sweat Rate Calculator

Coming soon

KYN

Get an adaptive training plan built around your heart rate, RPE and recovery — not just pace.