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Pace Calculator

Work out your running pace, finish time or distance from the other two, and see predicted times for 5K, 10K, half and full marathon.

Formulas last reviewed: September 2026

Disclaimer: Results are general estimates for information and education only. They are not medical advice, a diagnosis or a treatment plan. Please talk to a doctor or qualified health professional before making health, diet, exercise or pregnancy decisions.

What is running pace?

Pace is how long it takes you to cover one kilometre (or mile). It is the number most runners use to plan training and races, because it stays the same whether you run 5 km or 42 km.

This calculator solves any one of pace, time or distance when you know the other two, and predicts your finish time for popular race distances.

How it is calculated

Pace = time ÷ distance
Time = pace × distance · Distance = time ÷ pace

Speed is the reverse of pace: km/h = 3,600 ÷ seconds per kilometre. A mile is 1.609 km.

Worked example

5 km in 25 minutes

Pace
5:00 per km
Speed
12 km/h
10K at this pace
0:50:00
Half marathon
1:45:29

Pacing tips

  • Start races at or just slower than your goal pace; a fast start is the most common mistake.
  • Run most training at an easy, conversational pace and only a few sessions a week fast.
  • Race predictions assume you can hold the pace — longer distances usually need a slightly slower pace.

Frequently asked questions

How do I convert min/km to min/mile?

Multiply the pace per kilometre by 1.609. For example 5:00 per km is about 8:03 per mile.

What is a good 5K time?

For beginners 30 to 35 minutes is a fine target. Recreational runners often run 25 to 30 minutes, and fast club runners go under 20.

Is a marathon prediction reliable?

It is a straight-line estimate. Real marathon pace is usually slower than your 5K or 10K pace, so treat it as an upper limit.

How can I run faster?

Run consistently, add one weekly interval or tempo session, include strength work and rest well. Improve gradually to avoid injury.