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Pace Calculator
Your run
Hours : minutes : seconds.
Example: 5 km in 25:00 is a pace of 5:00 per km (8:03 per mile). In reverse, holding 8:00 per mile over 10 km takes 49:43.
Behind the numbers
How pace, time and distance relate
Pace, time and distance are three sides of the same calculation: if you know any two, you can work out the third. Pace is your total time divided by your distance, so a faster pace means fewer minutes per kilometre or per mile.
Worked example: 25:00 is 1,500 seconds. 1,500 ÷ 5 km = 300 seconds per km = 5:00/km. Per mile: 300 × 1.60934 = 483 seconds = 8:03/mi. In reverse: 10 km is 6.21 miles, and 6.21 × 8:00 per mile = 2,983 seconds = 49:43.
A few comparisons
Example paces
| Distance | Time | Pace per km | Pace per mile |
|---|---|---|---|
| 5 km | 25:00 | 5:00 | 8:03 |
| 10 km | 50:00 | 5:00 | 8:03 |
| 10 km | 45:00 | 4:30 | 7:15 |
| 5 mi | 40:00 | 4:58 | 8:00 |
| Half marathon (21.0975 km) | 2:00:00 | 5:41 | 9:09 |
| Marathon (42.195 km) | 4:00:00 | 5:41 | 9:09 |
Run the numbers before race day.
Work out your target pace before a race, then check it against a recent run — a pace you held for 5 km is not the pace you will hold for a half marathon.
Convert carefully between miles and kilometres: 1 mile is 1.60934 km, so a pace per mile is always a bigger number than the same pace per km.
Use the time mode to set a realistic goal: enter your distance and the pace you can hold, and see the finish time before you commit to it.
Remember that hills, heat and wind slow you down. A flat-course pace is a starting point, not a promise, on a hilly or hot day.
Good to know
Your pace questions, answered.
What is the difference between pace and speed?
Pace is time per distance, such as 5:00 per km, while speed is distance per time, such as 12 km/h. They are reciprocals: a 5:00 per km pace is 12 km/h, because 60 minutes divided by 5 minutes per km is 12 km in an hour.
How do I convert pace per mile to pace per km?
Divide the pace per mile by 1.60934. For example, 8:03 per mile is 483 seconds, and 483 divided by 1.60934 is 300 seconds, or 5:00 per km. This calculator shows both units for every result.
What pace do I need to run a 5K in under 30 minutes?
You need to average faster than 6:00 per km (9:39 per mile). A 30:00 finish over 5 km is exactly 6:00 per km, so holding 5:59 per km or quicker gets you under 30 minutes.
Can this calculator work out my finish time?
Yes. Choose “Time” under “What do you want to work out?”, enter your distance and your pace, and it gives your finish time. For example, 8:00 per mile over 10 km is 49:43.