Free tool

10K time predictor

A 5K or half in. Your 10K out.

Type any recent race result. We project your 10K finish time using the Riegel formula. Useful for setting realistic 10K goals before a race.

What did you run?
Units
1
Distance
Pick a preset or type any distance.
km
Quick distances:
2
Finish time
Hours, minutes, seconds.
Hours
Minutes
Seconds
Examples
Marathon
3:50:01
Predicted finish at Marathon

From 10K in 50:00, here are your projected race times.

Find Marathon races →
Predicted race times
5K
23:59
10K
50:00
15K
1:16:51
Half marathon
1:50:19
Marathon
3:50:01
50K
4:35:21

Common 10K predictions

Reference table — popular race times and the Riegel-projected 10K.

Input race resultPredictedNotes
5K 22:0010K ~45:43Solid sub-46 target.
5K 25:0010K ~51:58Sub-52 prediction.
Half 1:30:0010K ~40:48Sub-41 territory.
Half 1:45:0010K ~47:36Sub-48 goal.
Half 2:00:0010K ~54:24Approaching sub-55.
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