1. Pick your distance
Tap a preset — 5K, 10K, half marathon (21.0975 km), marathon (42.195 km) — or type any custom distance in kilometers or miles.
Free online tool
Running pace calculator.
Enter a distance and a time to get your pace per kilometer and per mile — or enter a target pace to project finish times for 5K, 10K, half and full marathon. Works both ways, right in the browser. On the road, RunEasy shows your live GPS pace so the plan survives contact with reality.
How to use it
How to use the pace calculator.
Know two of distance, time, and pace — the calculator gives you the third.
2. Enter time or pace
Enter your finish time to solve for pace, or switch modes and enter a pace to solve for finish time.
3. Read both units
Results show min/km and min/mile side by side, plus speed in km/h — handy for treadmill settings.
Reference
The numbers behind the tool.
Formulas, reference tables, and practical guidance you can come back to.
Pace-to-finish-time reference
Finish times for common race distances at popular target paces. Half marathon is 21.0975 km; marathon is 42.195 km.
| Pace (min/km) | Pace (min/mile) | 5K | 10K | Half | Marathon |
|---|---|---|---|---|---|
| 4:00 | 6:26 | 20:00 | 40:00 | 1:24:23 | 2:48:47 |
| 5:00 | 8:03 | 25:00 | 50:00 | 1:45:29 | 3:30:59 |
| 6:00 | 9:39 | 30:00 | 1:00:00 | 2:06:35 | 4:13:10 |
| 7:00 | 11:16 | 35:00 | 1:10:00 | 2:27:41 | 4:55:22 |
| 8:00 | 12:52 | 40:00 | 1:20:00 | 2:48:47 | 5:37:34 |
Training paces from one race result
A recent race result is the most reliable anchor for training paces. As rules of thumb: easy runs 60–90 seconds per km slower than 10K race pace, tempo runs roughly your one-hour race pace, and intervals at 3K–5K race pace. If you can chat during easy runs and can't during tempo, the paces are about right.
Treadmill speed conversion
Treadmills are set in km/h or mph, not pace. Speed (km/h) = 60 ÷ pace in minutes per km: 6:00/km = 10.0 km/h, 5:00/km = 12.0 km/h, 4:30/km = 13.3 km/h. Add 1% incline to better match outdoor effort.
FAQ
Frequently asked questions.
Quick answers about this tool and how to train with it.
What is a good 5K time for a beginner?
Many beginners finish their first 5K in 30–40 minutes (6:00–8:00 min/km). Breaking 30 minutes (under 6:00/km) is a common first milestone; experienced recreational runners often target 25 minutes or faster.
How do I convert pace between min/km and min/mile?
One mile is 1.609 km, so multiply a min/km pace by 1.609 to get min/mile. A 6:00/km pace is about 9:39/mile; a 10:00/mile pace is about 6:13/km. This calculator always shows both.
Should I aim for even splits in a race?
Even or slightly negative splits (second half marginally faster) is how most distance PRs are run. Going out faster than goal pace almost always costs more time late in the race than it saves early.
Why does my GPS pace differ from the race distance?
GPS watches typically record 0.5–1% extra distance from signal scatter and imperfect tangents, so your watch pace reads slightly fast. In a race, pace off the course's marked kilometers, and treat GPS as a guide.
For site owners
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<iframe src="https://www.bigbeefit.com/embed/running-pace-calculator" width="100%" height="560"
style="border:0;border-radius:12px" title="Running Pace Calculator – Pace, Finish Time & km/mile Splits"
loading="lazy"></iframe>
<p>Free <a href="https://www.bigbeefit.com/tools/running-pace-calculator">Running Pace Calculator – Pace, Finish Time & km/mile Splits</a> by BigBeeFit</p>Free for any website — blogs, gyms, coaching sites. Please keep the attribution link so your readers can find the full tool.
Plan here. Pace it on the road.
RunEasy tracks pace, distance, and routes with GPS and Apple Watch, syncs to Apple Health, and stays out of your way while you run — free on the App Store.