Running Calculators

Plan and pace your runs: work out pace and speed, finish times for any race distance, kilometre-by-kilometre splits including negative splits, and predictions for longer races from a recent result.

Pace Calculator

Running pace and speed from distance and time.

Running Speed Calculator

Convert running pace to speed and speed to pace.

Race Time Calculator

Finish time for any distance at your pace.

Running Split Calculator

Km-by-km splits for your goal time.

Marathon Time Predictor

Predict race times from a recent result.