Your Pace, Your Plan

Whether pacing a 10K or planning a marathon, the fundamental numbers are the same: distance, time, and the pace connecting them. This pace calculator takes distance and time and reports pace and speed in both metric and imperial units.

The Math

Pace = time ÷ distance — 45 minutes over 10 km is 4:30 per kilometer. Speed = distance ÷ time, its reciprocal: 13.3 km/h. The per-mile pace multiplies by 1.60934 so you can speak both languages at once.

Use It Forward

Once you know a sustainable pace, plan any finish: a 4:30/km runner covers the half marathon in about 1:35. Keep the pace honest over the first half of a race — most runners who blow up went out faster than this calculator would have advised.