Running Pace Calculator
Solve any of the three running variables — pace, finish time, or distance — from the other two, in km or miles, with quick-select buttons for 5K, 10K, half, and full marathon.
Race Predictions and Splits
Every result includes equivalent race times for 5K, 10K, half, and full marathon via the Riegel formula (T2 = T1 × (D2/D1)^1.06), plus a cumulative split table per kilometer or mile for pacing on race day.
Both Unit Systems, Always
Pace is shown in min/km and min/mile side by side, along with speed in km/h and mph — no mental conversion needed between training plans.