How to use it
- Step 1Pick a distance (1 mile, 5K, 10K, half, marathon) or enter custom miles.
- Step 2Enter your finish time in hours, minutes and seconds.
- Step 3Read your pace, speed, splits and predicted times for other races.
Pace and splits
Pace = time ÷ distance. A 30-minute 5K (3.107 miles) is 9:39 per mile, or 6:00 per km. Splits multiply that pace by each mile.
Race predictions
Predictions use Riegel's formula: T2 = T1 × (D2 ÷ D1)^1.06. It assumes you've trained for the longer distance. For beginners, marathon predictions from short races are often too fast.
Prefer a chart? See Pace charts: precomputed tables for common inputs.
More fitness
Common questions
What is a good 5K time?
It varies with age and experience. Many recreational runners finish between 25 and 40 minutes.
How do I convert pace per mile to pace per km?
Divide your mile pace by 1.609. A 10:00 mile is about 6:13 per km.
How accurate are race time predictions?
They're a reasonable guide if you've trained for the longer race. Heat, hills and fueling can change the result.
What pace is zone 2?
Zone 2 is set by heart rate, not pace. Use the heart rate zone calculator, then find the pace that keeps you there.