Running Pace Calculator
Get your pace, speed and predicted race finish times.
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Running pace is the time it takes you to cover one kilometre or one mile, written as minutes and seconds per unit of distance — for example 5:00/km. It is the number runners live by, because it describes effort more usefully than raw speed and makes it easy to plan a training run or a race. This calculator turns a distance and a time into your pace, converts that into speed in km/h and mph, and projects how long you would take to finish a 5K, 10K, half marathon and full marathon at the same pace.
How pace and speed are calculated
Pace is simply your total time divided by the distance you covered, so a run of 10 km in 50 minutes gives 3000 seconds divided by 10, or 300 seconds per kilometre — a pace of 5:00/km. Speed is the inverse relationship: distance divided by time. The same run works out to 12 km/h, since 10 km in 0.8333 hours equals 12. To switch between the two, divide 60 by your pace in minutes per kilometre; 60 divided by 5 again gives 12 km/h.
The calculator also shows pace per mile and speed in mph for runners who train in imperial units. One mile is 1.609 kilometres, so a pace of 5:00/km converts to about 8:03 per mile.
How the predicted finish times work
The race projections assume you hold your current pace for the whole distance. Each finish time is your pace per kilometre multiplied by the race length: 5 km, 10 km, 21.0975 km for the half marathon and 42.195 km for the full marathon. At 5:00/km, that puts your marathon at roughly 3:30:58 and your half marathon at about 1:45:29.
Treat these as an optimistic ceiling rather than a promise. In reality almost everyone slows over longer distances as fatigue builds, so a pace you can hold for 5 km will be hard to sustain across a marathon. They are most accurate when the predicted distance is close to the distance you actually ran.
Using pace in training
Knowing your pace lets you run at the right intensity for the session you intend. Easy runs should feel conversational and sit well above your race pace, while interval and tempo work targets a faster, more demanding pace. Checking your numbers regularly is one of the clearest ways to see fitness improve: a faster pace at the same effort, or the same pace at a lower heart rate, both mean progress.
How to use
- 01
Enter distance
Type the distance you ran in kilometres or miles.
- 02
Enter your time
Add the hours, minutes and seconds it took.
- 03
See pace & predictions
Read your pace per km/mile plus projected race times.
Frequently Asked Questions
Pace is the time it takes to cover one kilometre or mile, shown as minutes:seconds — the standard way runners measure effort.
They assume you hold the same pace. Real race times drift slower over longer distances, so treat them as an optimistic target.
Speed (km/h) = 60 ÷ pace in minutes per km. The calculator shows both for you.
Recreational runners often finish a 5K around 6–7 min/km; competitive runners dip under 4 min/km.
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Last reviewed June 2026 · Methodology & sources