Running Pace Calculator
Calculate your running pace (min/km), race time, or distance, and see predicted times for the 5K, 10K, half marathon, and marathon.
Processed on your device. Nothing you type is sent anywhere.
How to use: Running Pace Calculator
- Choose what you want to calculate: pace, race time, or distance.
- Fill in the other two fields (time in mm:ss or h:mm:ss; pace in min:sec per km).
- See your result, speed in km/h, and estimated finish times for popular race distances.
About this tool
What pace means and how to calculate it
Pace is how long it takes you to cover 1 km: total time ÷ distance. If you run 10 km in 55 minutes, your pace is 5:30 per km, or 10.9 km/h. To convert pace to speed, divide 60 by your pace in minutes (60 ÷ 5.5 = 10.9 km/h).
| Pace | Speed | 5K | 10K |
|---|---|---|---|
| 7:00 /km | 8.6 km/h | 35:00 | 1:10:00 |
| 6:00 /km | 10 km/h | 30:00 | 1:00:00 |
| 5:00 /km | 12 km/h | 25:00 | 50:00 |
| 4:30 /km | 13.3 km/h | 22:30 | 45:00 |
Estimated times for longer races
This estimate uses the Peter Riegel formula (1977): T₂ = T₁ × (D₂ ÷ D₁)^1,06. The 1.06 exponent accounts for the natural slowdown over longer distances. The formula works well if you’ve trained for your target distance; for your first marathon, add a 5% to 10% buffer.
- Use your time from a recent race run at a hard effort as your baseline.
- Heat, hills, and altitude can increase your actual finish time.
Frequently asked questions
How do you calculate running pace?
Divide your total time by the distance in kilometers. If you ran 5 km in 30 minutes, your pace is 6:00 per km. The calculator accepts time in mm:ss or h:mm:ss.
What’s a good running pace for beginners?
A pace of 6:30 to 8:00 per km is common for beginners. During easy runs, you should be able to hold a conversation; your pace will improve with consistency.
What pace do I need to run 10K in under an hour?
You’ll need an average pace under 6:00 per km, which is faster than 10 km/h. To finish in 50 minutes, you’ll need to run at a 5:00 per km pace.
Is it really free? Is there a daily limit?
It's free with no daily limits. Processing happens on your device, so there's no per-use cost and no need to limit you.
Does it work on phones?
Yes. The site works in any modern browser on Android, iPhone, Windows, Mac, and Linux—no installation needed.
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