Running Pace Calculator
Enter a distance and the time it took, and this calculator returns your pace per kilometer and per mile plus your speed. It also projects finish times for the standard race distances (5K, 10K, half marathon, and marathon) if you held that same pace.
- Pace per kilometer
- 5:30
- Pace per mile
- 8:51
- Speed
- 10.9 km/h (6.8 mph)
At this pace you would finish
- 5K
- 27:30
- 10K
- 55:00
- Half marathon
- 1:56:02
- Marathon
- 3:52:04
Pace is the number runners actually train with, because it transfers between workouts of different lengths. Note that the race projections assume the same pace across all distances; in reality most runners slow a bit as distance grows, so treat the marathon projection as optimistic unless you train for it.
How it's calculated
Pace = time ÷ distance · Speed = distance ÷ time
Pace per mile equals pace per kilometer multiplied by 1.609. Race projections multiply the pace by each race distance: 5 km, 10 km, 21.0975 km for the half marathon, and 42.195 km for the marathon.
Worked example
A 5K finished in 27:30 is a pace of 5:30 per kilometer (8:51 per mile) and a speed of 10.9 km/h. At that pace, a 10K projects to 55:00, a half marathon to 1:56:02, and a marathon to 3:52:04.
Frequently asked questions
›What is a good running pace for a beginner?
Most beginners run somewhere between 6:30 and 8:00 per kilometer (10:30 to 13:00 per mile). Pace improves quickly in the first months. The pace you can hold while speaking full sentences is the standard easy-run guideline, whatever number that is for you.
›Why is my race projection too optimistic for the marathon?
Holding a 5K pace for 42 km is not physiologically realistic. Rules of thumb like Riegel's formula add about 6% time per doubling of distance. A marathon typically runs 20 to 30 seconds per kilometer slower than your half marathon pace.
›How do treadmill paces compare to outdoor running?
A flat treadmill is slightly easier than outdoor running because there is no air resistance. Setting a 1% incline is the common way to make treadmill effort match road effort at typical training speeds.
›Should I train by pace or heart rate?
Both work. Pace is precise on flat ground; heart rate adapts automatically to hills, heat, and fatigue. Many training plans mix them, using pace for intervals and heart rate for easy runs.
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