Pace Calculator guide
Pace Calculator: Running Pace, Time and Distance
Use our pace calculator to work out your running pace per km or mile, your finish time or your distance, with finish times for 5K, 10K, half marathon and marathon.
By the AllCalculator editorial teamUpdated 16 October 20262 min read
Whether you're training for your first parkrun or a marathon, knowing your pace helps you plan. Our Pace Calculator works out pace, time or distance from the other two, in kilometres or miles.
How to use the calculator (Pace Calculator)
- Choose what to work out: pace, time or distance.
- Choose a distance, such as 5K or a marathon, or enter your own.
- Choose kilometres or miles.
- Enter your time or pace.
You'll see your pace per km and per mile, your speed and a table of finish times at that pace for common race distances.
The formulas
- Pace = time ÷ distance
- Time = pace × distance
- Distance = time ÷ pace
One mile is 1.609km, so a pace of 5:00 per km is 8:03 per mile.
Worked examples
- With the calculator's default settings, 10K in 55 minutes is a pace of 5:30 per km (8:51 per mile), or 10.9km/h.
- A marathon at 5:00 per km takes about 3 hours 31 minutes.
- Running at 6:00 per mile for an hour covers 10 miles.
Common race distances
| Race | Distance |
|---|---|
| parkrun or 5K | 5km (3.1 miles) |
| 10K | 10km (6.2 miles) |
| Half marathon | 21.1km (13.1 miles) |
| Marathon | 42.2km (26.2 miles) |
Frequently asked questions
What's a good running pace?
It depends on your age, fitness and distance. Many new runners start at 6:30 to 8:00 per km. What matters is that you can keep going comfortably, especially on easy runs.
Should I run at an even pace?
For races, an even pace or a slightly faster second half usually gives the best result. Starting too fast is the most common mistake.
Why is my race slower than the calculator says?
The calculator assumes an even pace. Hills, wind, crowds and tiredness all slow you down over longer distances.
To predict a marathon time from a shorter race, use our Marathon Run Time Calculator. To set training intensities, try the Target Heart Rate Calculator.
Sources and further reading
Links open official and independent websites in a new tab.
This guide is general information to help you understand your options. It isn't financial, tax, legal or building advice and doesn't take your personal circumstances into account. Figures were checked when the guide was last updated and can change, so confirm anything important with GOV.UK, HMRC, a regulated adviser or a qualified tradesperson.