Pace Calculator
Running pace, finish time, and speed — with per-distance splits.
Calculate your running pace, finish time, speed, and per-kilometer (or per-mile) splits. Solve for any one of pace, time, or distance by entering the other two.
Quick-select common race distances (5K, 10K, half marathon, marathon) and switch between km and miles. Everything runs in your browser.
📖 Read the guide: What Pace Do You Need for a Sub-2-Hour Half Marathon?
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Formula
Pace
pace = time ÷ distance
Shown as minutes:seconds per kilometer or mile.
Speed
speed = distance ÷ time
Reported in km/h or mph.
How to use the pace calculator
- 1Choose a mode: Pace, Time, or Distance.
- 2Enter the two known values (use the quick-select buttons for race distances).
- 3Read your pace, speed, finish time, and the splits table.
Examples
| Example | Input | Result |
|---|---|---|
| Pace | 10 km in 50:00 | 5:00/km · 12 km/h |
| Time | Marathon at 5:00/km | 3:30:58 |
| Distance | 60:00 at 5:00/km | 12 km |
What running pace means
Pace is how long it takes you to cover one unit of distance — for example, 5:00 per kilometer means each kilometer takes five minutes. It's the most useful number for runners because it's directly comparable across distances and easy to hold during a race. Speed (km/h or mph) is the same information expressed as distance per hour.
Planning a race with splits
The splits table shows your cumulative time at each kilometer or mile, which is how you pace a race in practice. To run an even race, aim to hit each split at the same pace; many runners plan a slight negative split (running the second half a touch faster). Enter a goal finish time in Time mode to see the pace and splits you'd need.
Frequently asked questions
What is running pace?
Pace is the time it takes to cover one unit of distance, shown as minutes:seconds per kilometer or mile. A 5:00/km pace means each kilometer takes five minutes.
How do I calculate my pace per km?
Divide your total time by the distance. For example, 50 minutes (3,000 seconds) over 10 km is 300 seconds per km, or a 5:00/km pace. The Pace mode does this for you.
What is a good pace for a 5K?
It depends on fitness and goals. A beginner might run 7:00–8:00/km, a recreational runner around 5:30–6:30/km, and a competitive runner under 4:00/km. Use the calculator to set realistic splits for your target time.
How do I convert pace to speed?
Speed is distance ÷ time. A 5:00/km pace is 12 km/h (60 minutes ÷ 5 minutes per km). The calculator shows both pace and speed for every result.
What pace do I need to run a sub-2-hour half marathon?
A half marathon is 21.0975 km, so under 2 hours requires faster than about 5:41/km (or roughly 9:09/mile). Use Time mode with a 1:59:59 goal to see the exact pace and splits.
How do I calculate my marathon finish time?
Enter the marathon distance (42.195 km) and your goal pace in Time mode. For example, 5:00/km gives a finish time of about 3:30:58.
Embed this calculator
Add the Pace Calculator to your own website — free. Copy and paste this snippet:
<iframe src="https://numvella.com/embed/pace-calculator" width="100%" height="460" style="border:1px solid #e2e8f0;border-radius:12px" title="Pace Calculator — Numvella" loading="lazy"></iframe>