How do I work out my race pace?

Divide your finish time by the distance. A 50:00 10K is 5:00 per km. Pick a distance above, choose My pace, and enter your finish time.

What pace do I need for a 4-hour marathon?

About 5:41 per km. Choose Marathon, then My pace, and enter 4:00:00 to see your km splits.

How are the times at other distances worked out?

They use Riegel's formula, a common way to predict a race time from another result. Treat them as estimates: most runners slow down more than predicted over longer distances, especially without the training for them.

Does this account for hills or hot weather?

Not yet. The splits assume an even pace on a flat course. Expect to run slower on a hilly course or a hot day.

Running tools

Race Pace Calculator

Work out your pace per km or your finish time, then see your kilometre splits. Got a goal race? Find one in the race calendar.

Pace: 5:00 /km
Finish time for 10 km: 50:00

At other distances

Estimates from this result using Riegel's formula. Longer races usually come out slower than predicted.

5K
23:59
4:48 /km
Half marathon
1:50:19
5:14 /km
Marathon
3:50:01
5:27 /km

Kilometre splitsEven pace

km	Time
1	5:00
2	10:00
3	15:00
4	20:00
5	25:00
6	30:00
7	35:00
8	40:00
9	45:00
10	50:00

Questions

How do I work out my race pace?: Divide your finish time by the distance. A 50:00 10K is 5:00 per km. Pick a distance above, choose My pace, and enter your finish time.
What pace do I need for a 4-hour marathon?: About 5:41 per km. Choose Marathon, then My pace, and enter 4:00:00 to see your km splits.
How are the times at other distances worked out?: They use Riegel's formula, a common way to predict a race time from another result. Treat them as estimates: most runners slow down more than predicted over longer distances, especially without the training for them.
Does this account for hills or hot weather?: Not yet. The splits assume an even pace on a flat course. Expect to run slower on a hilly course or a hot day.