Running Pace Calculator: Pace, Time, Distance, Splits and Race Predictor
Free running pace calculator: enter any two of distance, time and pace to get the third. Get km and mile paces, even, negative or positive splits with a chart, Riegel race time predictions for 5K to marathon, and treadmill speeds.
Fill in any two of distance, time and pace: the third is worked out for you. Type times as 25:30, 1:45:30 or 45m.
Splits and race strategy
Times for other distances
At this pace holds your current pace the whole way. Predicted uses the Riegel formula (time × (distance ratio)1.06): what you could run if you were equally fit and trained for that distance. It is more reliable between close distances than from a 5K to a marathon.
Treadmill and speed
How to calculate running pace
Pace is how long it takes to cover one kilometre or one mile: pace = time ÷ distance. Run 5 km in 25:00 and your pace is 25:00 ÷ 5 = 5:00 per km (8:03 per mile, or 12 km/h). Knowing any two of distance, time and pace gives you the third: time = pace × distance and distance = time ÷ pace.
Pace conversions
- Pace per mile = pace per km × 1.609
- Pace per km = pace per mile ÷ 1.609
- Speed in km/h = 3,600 ÷ pace in seconds per km
- Speed in mph = 3,600 ÷ pace in seconds per mile
Even, negative and positive splits
An even split runs the same pace throughout. A negative split runs the second half faster, which is what most coaches recommend for races because it avoids going out too hard. A positive split means slowing down. Move the pacing slider to see what each plan looks like per kilometre or mile; the splits are scaled so they always add up to your finish time.
Questions
- What is a good running pace?
- It depends on age and training. A typical recreational runner covers 5 km in about 30 minutes (6:00 per km, 9:40 per mile). Beginners often start at 7:30–9:00 per km.
- How accurate are the race predictions?
- Within a few percent between similar distances if your training suits the longer distance. Marathon predictions from a 5K tend to be too optimistic unless you have the mileage.
- Is my data private?
- Yes. Everything stays in this browser.
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