Running Pace Calculator

Calculate running pace per km and mile, speed, and predicted 5K, 10K, half marathon and marathon times.

What is my running pace?

Pace = time ÷ distance. Running 10 km in 50 minutes is a pace of 5:00 per km (8:03 per mile) and an average speed of 12 km/h. The calculator also predicts other race times with Riegel’s formula.

Riegel’s formula

T₂ = T₁ × (D₂ ÷ D₁)^1.06. It assumes you train appropriately for the longer distance; most runners are a little slower than predicted for the marathon.

Frequently asked questions

What is a good 5K time?

For recreational runners, 25–35 minutes is typical; under 20 minutes is fast.

Can I enter pace instead of time?

Yes, leave the time empty and enter your pace per km or mile.

Is it free?

Yes.