Sport & running
How do you convert running pace to km/h?
Convert running pace to speed and estimate your 5K, 10K, half marathon and marathon times.
Quick answer
Running pace is minutes and seconds per kilometre; speed in km/h is 3600 divided by pace in seconds. A pace of 5:30 per km is 330 seconds: 3600 ÷ 330 = 10.9 km/h. The same formula gives race times: multiply pace seconds by distance (a 10K at 5:30/km finishes in 55 minutes).
Speed
10.91 km/h
- Pace per mile
- 8′ 51″
- 5K
- 27′ 30″
- 10K
- 55′ 00″
- Half marathon
- 1h 56′ 02″
- Marathon
- 3h 52′ 04″
How it works
Pace and speed are two views of the same effort — runners think in min/km, cyclists and treadmills in km/h. Use the calculator above to flip between them and see projected times for 5K, 10K, half marathon and marathon at your current rhythm. A GPS running watch logs splits automatically; pair it with a heart rate chest strap if you train by zones.
Race planning starts here: once you know your comfortable pace, plug it into the race-time calculator for finish estimates. Easy runs should feel 60–90 seconds slower per km than 5K race pace — if every run is a time trial, injury risk climbs. General training guidance only, not medical advice.
Two ways the number on the screen is not the number you ran. A treadmill belt is being pulled under you and there is no air to push through, so the same effort shows a faster pace than the road — setting the incline to 1% brings the two roughly back together. Outdoors the distortion is the watch: GPS cuts corners on twisting paths and wanders under tree cover or between tall buildings, so a route through woods usually measures short and a lap of a park with many bends measures long. If you are comparing weeks, compare the same route measured the same way.
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Frequently asked questions
What is a good running pace for a beginner?+
Most new runners start around 7–8 min/km (7.5–8.5 km/h). Consistency matters more than speed: hold a pace where you can speak in short sentences. As aerobic fitness improves, the same effort naturally gets faster — expect 10–20 seconds per km improvement over a few months of regular easy mileage.
How do I convert min/mile to min/km?+
Multiply min/mile by 0.621 to get min/km, or divide min/km by 0.621 for min/mile. Example: 8:00/mile ≈ 4:58/km. One mile is 1.609 km, so pace per km is always shorter in minutes than pace per mile. US race results often list mile splits — convert each split before comparing to European km-based training plans.
What pace do I need for a sub-2-hour half marathon?+
2 hours for 21.1 km requires 5:41/km (341 seconds per km). That is roughly 10.6 km/h average. Build up with long runs 30–60 seconds slower than race pace and one weekly tempo session at goal pace — jumping straight to 5:41/km without a base invites shin splints and burnout.
Why does my GPS watch pace differ from the treadmill?+
GPS measures ground covered with small errors on turns, trees and tall buildings. Treadmills report belt speed exactly but may be miscalibrated by 1–3%. Outdoors, run known measured distances to verify your watch — many tracks are 400 m per lap; four laps should match your watch within a few seconds.
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