Pace Calculator
Enter a distance and a time to get your pace per km and mile, your speed, and projected race times at that pace.
What this tool does
Pace is the time it takes to cover one kilometre or one mile. Enter your distance and time and the calculator shows your pace in minutes per kilometre and per mile, your speed in km/h and mph, and what the same pace would give over a 5K, 10K, half marathon and marathon. Running 10 km in 50 minutes is 5:00 per km, or 8:03 per mile.
Calculates pace per km and per mile and speed from a distance and a time.
Projects the finish times for standard race distances at the same pace.
How to use it
- Choose kilometres or miles and enter the distance.
- Enter your time in hours, minutes and seconds.
- Read the pace and speed.
- Check the projected race times.
Why use this calculator
Turns a distance and a time into your pace per kilometre and per mile, and your speed in km/h and mph. Pace is the number runners plan and train by, but races and watches mix kilometres and miles, and finish times are not obvious from a pace. Having the conversion and the projections together makes training and pacing straightforward.
Why we built it
We built the pace calculator to turn a distance and a time into pace per kilometre and per mile, speed in km/h and mph, and projected race times at that pace. The speed distance time calculator solves for any one of the three, and the calories burned calculator estimates the effort.
Handy alongside this: the Tip Calculator.
Who this tool is for
- Runners planning a race
- Walkers and cyclists tracking training
- Coaches setting target splits
When to use it
- Setting a target pace for a race.
- Converting between min/km and min/mile.
- Reviewing a training run.
- Working out what a marathon goal implies per kilometre.
How it works
Pace per kilometre = total time ÷ distance in km; pace per mile = total time ÷ distance in miles (1 mile = 1.609344 km). Speed in km/h = km ÷ hours.
Race projections multiply the per-kilometre pace by 5, 10, 21.0975 and 42.195 km. They assume an even pace, which is harder to hold the longer the race, so real marathon times are usually slower than a 10K-pace projection.
Use the projections as a rough guide. Fitness, terrain, weather and pacing all affect real results.
A worked example
These are the values the calculator opens with, so you can see exactly what it does with them. Change any value on the page and the result updates; the figures below come from the same calculation.
| Input | Value |
|---|---|
| Distance unit | Kilometres |
| Distance | 10 |
| Time - hours | 0 |
| Time - minutes | 50 |
| Time - seconds | 0 |
With those inputs, the calculator returns:
- Pace per kilometre: 5:00
- Pace per kilometre: 5:00
- Pace per mile: 8:03
- Speed: 12 km/h · 7.46 mph
- Same pace over a 5K: 0:25:00
- Same pace over a 10K: 0:50:00
- Same pace over a half marathon: 1:45:29
- Same pace over a marathon: 3:30:59
What you give it, and what you get back
| Item | Details |
|---|---|
| Distance | The distance covered, in kilometres or miles. |
| Time | Hours, minutes and seconds. |
| Result | Pace per km and mile, speed in km/h and mph. |
| Projections | Finish times at the same pace for 5K, 10K, half and full marathon. |
Issues you may run into
| What you see | Why it happens | What to do |
|---|---|---|
| "Enter a distance and a time" | Distance or time is 0. | Enter both. |
| Projected marathon time seems too fast | It assumes you can hold the pace. | Add a realistic slowdown. |
| Pace looks like a decimal | Minutes are shown as m:ss. | It is minutes and seconds. |
| Watch shows a different pace | GPS distance differs. | Use the same distance as the watch. |
Assumptions and limitations
- Even pace only; no negative splits or hills.
- Projections are a guide.
- Distance units are kilometres and miles.
Frequently asked questions
How do I calculate running pace?
Divide the time by the distance. 50 minutes for 10 km is 5 minutes per km.
How do I convert min/km to min/mile?
Multiply by 1.609344. 5:00 per km is about 8:03 per mile.
What pace do I need for a 4-hour marathon?
About 5:41 per kilometre, or 9:09 per mile. Enter 42.195 km and 4:00:00 to check.
What is a good running pace?
It depends on age, fitness and distance. Use it to track your own progress rather than compare.
Does it predict my race time?
It projects the same pace over longer distances. Real times usually slow with distance.
Is it free and private?
Yes. It runs in your browser.