How do I calculate running pace?

Divide your time by the distance. Enter a distance and finish time and the calculator returns your pace per kilometre and per mile plus your average speed.

How does the race-time predictor work?

It uses Riegel's endurance formula, T2 = T1 × (D2/D1)^1.06, to estimate an equivalent time at another distance from one known result.

ToolsRunning Pace

Running pace & race-time calculator

Enter a distance and time to get your pace and speed, then read a predicted time for every distance from 1K to the marathon, using Riegel's endurance model.

Your numbers ride along in the link: whoever opens it lands on this exact result.

Your run

Show pace

Distance

Time · h : m : s

hrsminsec

Pace

5:00/km

Speed

12km/h

DistanceTimePace /km

1K4:214:21

1 Mile7:134:29

5K23:594:48

10K50:005:00

15K1:16:515:07

Half Marathon1:50:195:14

Marathon3:50:015:27

Predictions assume even, well-trained pacing. The highlighted row is your input.

All training tools

Keep goingAll 15 tools

Rowing & Erg Pace Calculator

Split, watts & calories

Hyrox® Pacing Calculator

Race-day target & splits

Sweat Rate & Hydration Calculator

Fluid loss & drinking plan

Running Pace Calculator

Calculate running pace and speed from any distance and time, and predict your 5K, 10K, half-marathon and marathon times from one result with the Riegel formula. Free, per-km or per-mile.

Enter a distance and time to get your pace per kilometre and mile and your average speed, then read a predicted time for every distance using Riegel's endurance formula.

Example: race times equivalent to a 50:00 10K

Distance	Predicted time	Pace /km
1K	4:21	4:21
1 Mile	7:13	4:29
5K	23:59	4:48
10K	50:00	5:00
15K	1:16:51	5:07
Half Marathon	1:50:19	5:14
Marathon	3:50:01	5:27

Keep going

Rowing & Erg Pace Calculator: Split, watts & calories
Hyrox® Pacing Calculator: Race-day target & splits
Sweat Rate & Hydration Calculator: Fluid loss & drinking plan

All 15 tools