Enter two of distance, time and pace: the calculator finds the third, along with your speed in km/h.
Pace
5:00/km
Speed
12km/h
Target paces for common goals
Goal
Pace
Speed
10K · 40:00
4:00 /km
15 km/h
10K · 45:00
4:30 /km
13.3 km/h
10K · 50:00
5:00 /km
12 km/h
10K · 1:00:00
6:00 /km
10 km/h
Half marathon · 1:30:00
4:16 /km
14.1 km/h
Half marathon · 1:45:00
4:59 /km
12.1 km/h
Half marathon · 2:00:00
5:41 /km
10.5 km/h
Marathon · 3:00:00
4:16 /km
14.1 km/h
Marathon · 3:30:00
4:59 /km
12.1 km/h
Marathon · 4:00:00
5:41 /km
10.5 km/h
Marathon · 4:30:00
6:24 /km
9.4 km/h
Indicative estimates: they assume training suited to the target distance and are not a substitute for medical advice.
Converting pace and speed
Pace is expressed in minutes per kilometre, speed in km/h. To convert, divide 60 by the pace in decimal minutes: 5:00/km is 12 km/h, 4:30/km is 13.3 km/h. Watches show pace because it reads directly as split times.
Working out your race pace
Your target pace is your goal time divided by the distance. A 4-hour marathon needs 5:41/km; 3:30 needs 4:59/km. Allow a small margin: aid stations, corners and GPS tracks often add 1–2% to the distance you actually run.
Holding your pace on race day
Start slightly slower than target pace for the first kilometres, then settle in. An even pace costs less energy than a stop-and-go race, especially over a half or full marathon.
Frequently asked questions
What pace for a 4-hour marathon?
5:41 per kilometre, an average of 10.5 km/h. With a margin for the distance you actually run, aim for 5:36 to 5:38/km.
How do I convert speed into pace?
Divide 60 by the speed in km/h to get minutes per kilometre: 12 km/h gives 5 minutes per kilometre, 15 km/h gives 4 minutes.
Why does my watch show a longer distance than the race?
The official course is measured along the shortest line. In a race you drift through corners and when passing, and GPS adds some error: 1–2% extra is common.
Turn these numbers into a training plan.
Paceo builds your road, trail or ultra plan from your VO2max pace and your Garmin, Coros, Suunto or Strava workouts, then adjusts it every week.
