Online Tool Store
Pace Calculator
Calculate running pace per km and per mile, plus speed in km/h and mph, from any distance and time. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
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Example shown — enter your own distance and time.
- Pace / km
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- Pace / mi
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- Speed (km/h)
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- Speed (mph)
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How it works
- Enter the distance you covered (or plan to) and pick km or miles.
- Enter the time it took, or the time you're targeting.
- See your pace per km and per mile, plus speed in km/h and mph, all updated live.
The formula
Pace is simply time divided by distance:
Pace (min/km) = Total minutes ÷ Distance in km
Speed (km/h) = Distance in km ÷ (Total minutes ÷ 60)
Example: a 5K in 25 minutes is 25 ÷ 5 = 5:00 min/km, or 5 ÷ (25/60) = 12 km/h.
FAQ
What does "pace" mean versus "speed"?
Pace is minutes per unit of distance (how long each kilometer or mile takes) — the way runners usually think about effort. Speed is the same information inverted, in distance per hour, which is more familiar for cycling or driving.
Can I use this for a race split or negative-split planning?
This calculates an overall average pace for the whole distance and time you enter. For per-mile splits or a pacing strategy across a race, run the numbers for each segment separately using its own distance and target time.
Does it work for swimming or cycling too?
The math is the same for any distance/time combination, but the units (min/km, mph) are set up for running and walking. For swimming, most people track pace per 100m instead — this tool doesn't have that unit built in.
Is my data uploaded anywhere?
No — the calculation is simple arithmetic done locally in your browser.
How we compare
| Feature | Online Tool Store | Runner's World calculator | Strava (app) |
|---|---|---|---|
| Pace, speed, km, and miles together | ✓ | Pace only | Requires a tracked activity |
| No account or app install | ✓ | ✓ | Account required |
| No ads | ✓ | Ad-supported | ✓ |
For planning a goal time before a run even happens, a quick calculator beats digging through an app that expects you to have already tracked the activity.