CalcPenguin

Running Pace Calculator

Your running pace per kilometre and per mile, your speed, and finish times for a 5K, 10K, half marathon and marathon.

Your numbers are saved in this browser.

Pace

5:30 per km

Pace per mile
8:51 per mile
Speed
10.9091 km/h (6.78 mph)

10K in 55:00 is a pace of 5:30 per km (8:51 per mile).

How it's worked out

  1. Total time55:00
  2. Pace3,300 s ÷ 10 km5:30 per km
  3. Speed10 km ÷ 0.9167 h10.91 km/h
Finish times at this pace
RaceTime
5K27:30
10K55:00
Half marathon1:56:02
Marathon3:52:04
  • Finish times assume the same pace all the way; most runners slow a little over longer races.

The formula

Pace = time ÷ distance · Speed = distance ÷ time

Worked example

A 10K in 55:00 is a pace of 5:30 per km (8:51 per mile), or 10.9 km/h. Kept up, that pace would finish a 5K in 27:30, a half marathon in 1:56:02 and a marathon in 3:52:04.

Questions people ask

How do I work out my running pace?

Divide your time by the distance. A 10K in 55 minutes is 55 ÷ 10 = 5.5 minutes, or 5:30 per km.

How do I convert pace per km to pace per mile?

Multiply by 1.609. 5:30 per km is about 8:51 per mile.

What pace do I need for a sub-2-hour half marathon?

Faster than 5:41 per km (9:09 per mile) all the way.

Formula and rules last checked 25 October 2026Written and tested by the CalcPenguin teamReport a problem