Running Pace Calculator
Work out your running pace from a race or training run, the finish time you will get at a pace, or how far you go in a given time. Use km or miles, pick a race distance, and compare 5K, 10K, half marathon and marathon times at the same pace and with Riegel's prediction.
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Result
Type a distance and a time (or a pace) to see the result.
Times rounded to the second. The Riegel prediction assumes a race effort and similar training for the longer distance; it is a guide, not a promise.
The link carries the distance, time and pace typed on this page and nothing else.
Classic race distances
| Race | At this pace | Riegel prediction |
|---|
Half marathon 21.0975 km, marathon 42.195 km.
How pace is calculated
One relation
Time = distance × pace. Pace = time ÷ distance; time = pace × distance; distance = time ÷ pace. A 10K in 50:00 is 3,000 seconds ÷ 10 km = 300 seconds, a pace of 5:00 per km.
Km and miles
One mile is 1.609344 km. A pace of 5:00 /km is 8:03 /mi; speed in km/h = 60 ÷ pace in minutes.
Riegel prediction
Peter Riegel found that race times grow a little faster than distance: T2 = T1 × (D2 ÷ D1)^1.06. From a 50:00 10K it predicts about 3:50:01 for a marathon, slower than the 3:30:59 of the same pace all the way.
What this leaves out
Hills, heat, wind and fuelling. For long races, the prediction works best when you have trained for that distance.
Formulas
- Pace
- time ÷ distance
- Finish time
- pace × distance
- Distance
- time ÷ pace
- Riegel
- T2 = T1 × (D2 ÷ D1)^1.06
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- Choose what to find: pace, finish time or distance, and km or miles.
- Pick a race distance or "Other distance" and type it.
- Type the time (hours, minutes, seconds) or the pace (minutes and seconds per km or mile).
- Read the result, compare the race table and copy the link or download the card.
Examples
10K in 50:00
Pace 5:00 /km (8:03 /mi), 12 km/h. At the same pace a marathon takes 3:30:59; Riegel predicts 3:50:01.
Marathon at 5:30 /km
Finish time 3:52:04. The same pace gives a 27:30 5K and a 55:00 10K.
5K in 27:54 in miles
3.1 miles in 27:54 is 9:00 /mi (5:36 /km), 6.67 mph.
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Put this tool on your blog, store or club site. It runs inside your page, free, with no account, and a small "by VISU" credit line under it.
Questions
How do I calculate my running pace?
Divide the time by the distance. 50 minutes for 10 km is 5 minutes per km, written 5:00 /km.
What pace do I need for a sub-4 marathon?
Under 5:41 /km, or about 9:09 /mi, all the way. Type the marathon and 3:59:59 to see it.
How do I convert pace per km to pace per mile?
Multiply by 1.609344. 5:00 /km is 8:03 /mi.
What is the Riegel formula?
A prediction of race time at a new distance: T2 = T1 × (D2 ÷ D1)^1.06. It assumes you race both distances with the same effort and training.
How long is a half marathon?
21.0975 km (13.1 miles). A marathon is 42.195 km (26.2 miles).
Is my data saved?
No. Everything runs in your browser. Only the "copy link" button puts your numbers in a link, and only when you use it.