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SnapCalculations

Pace Calculator

Find your pace from a distance and time, your finish time from a target pace, or how far you'll go. Works in kilometers or miles.

What do you want to find?
Units

e.g. 1:45:30 or 25:00

Pace per kilometer

5:30

10 km in 55:00

Pace per km
5:30
Pace per mile
8:51
Speed (km/h)
10.91
Speed (mph)
6.78

Race time predictions

From your result, using Riegel's formula. Most reliable for races close to the distance you entered.

RacePredicted timePace per km
5K26:235:17
10K55:005:30
Half marathon2:01:215:45
Marathon4:13:016:00

Step-by-step solution

Worked out with your numbers. Change any value above and the steps update.

  1. 1

    Convert the time to seconds

    55:00 = 3300 s

  2. 2

    Pace = time ÷ distance

    3300 s ÷ 10 km = 330 s per km

  3. 3

    Convert seconds back to minutes:seconds

    330 s = 5:30 per km

How it works

  • Pace = time ÷ distance, shown in minutes:seconds per kilometer or per mile.
  • Finish time = distance × pace; distance = time ÷ pace.
  • Race predictions use Riegel's formula: T₂ = T₁ × (D₂ ÷ D₁)^1.06.

Worked examples

10K in 55 minutes

What pace is a 10K run in 55:00?

  1. 55:00 = 3,300 seconds.
  2. 3,300 ÷ 10 km = 330 seconds per km = 5:30.
  3. Per mile: 330 × 1.609 = 531 s = 8:51.

Answer: 5:30 per km (8:51 per mile)

Try this example

A marathon at 6:00 per km

How long does a marathon take at a steady 6:00 per km?

  1. Marathon = 42.195 km.
  2. 42.195 × 360 s = 15,190 s.
  3. 15,190 s = 4 h 13 min 10 s.

Answer: 4:13:10 (9:39 per mile)

Try this example

Frequently asked questions

How accurate are the race predictions?

They assume you train for the longer distance. Predictions from a 5K to a marathon are often too optimistic, so use a recent half marathon to predict a marathon.

How long is a half marathon?

21.0975 km (13.1 miles). A marathon is 42.195 km (26.2 miles).

Results are estimates for general information and are not financial, medical or professional advice.