Pace & Speed Calculator
Convert running pace to speed and back, see finish times for 5K to marathon, and predict race times from a recent result.
About Pace & Speed Calculator
This pace and speed calculator converts running pace in minutes per km or per mile into speed in km/h or mph, and back again. As you type, it also shows finish times for 5K, 10K, half marathon and full marathon at that pace.
A race predictor estimates your times for other distances from a recent race result, which helps runners set realistic goals and plan training. It also suits walkers and cyclists who want to convert between pace and speed. The calculator is free, needs no sign-up and runs in your browser.
How to use Pace & Speed Calculator
- Enter your pace per km or per mile (mm:ss), or a speed in km/h or mph.
- The other values update, along with finish times for 5K, 10K, half and full marathon.
- In the predictor, enter a recent race distance and time to estimate your other race times.
Frequently asked questions
How do I convert pace to speed?
Speed (km/h) = 60 ÷ pace in minutes per km. A 6:00 /km pace is 10 km/h.
How does the race predictor work?
It uses Peter Riegel’s formula T₂ = T₁ × (D₂ ÷ D₁)^1.06, which assumes you have trained for the longer distance. Marathon predictions from short races are often optimistic.
How long is a half marathon?
21.0975 km (13.1 miles). A full marathon is 42.195 km (26.2 miles).
How do I convert min per km to km per hour?
Divide 60 by your pace in minutes. A pace of 6:00 min/km is 60 ÷ 6 = 10 km/h.
What is a good running pace for beginners?
Many beginners run between 6:30 and 8:00 min per km. An easy pace where you can still talk is a good start.
How do I convert min per mile to min per km?
Divide the pace per mile by 1.609. For example, 8:00 min/mile is about 4:58 min/km.
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