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Health & Fitness

Pace Calculator

Work out your running or walking pace, finish time or distance. Enter any two of distance, time and pace and see the result in min/km, min/mi, km/h and mph.

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Distance
Time
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Times and paces are rounded to the nearest second.

How to use the pace calculator

First choose what you want to find:

  • Pace: enter a distance and a time.
  • Time: enter a distance and a pace.
  • Distance: enter a time and a pace.

For the distance, pick a common race (5K, 10K, half marathon, marathon or 1 mile) or choose Custom distance and type any distance in kilometers or miles. Enter times as hours, minutes and seconds; you can leave a field empty if it is zero. Enter a pace as minutes and seconds per kilometer or per mile. Press Calculate to see the answer, together with the pace in both min/km and min/mi and the speed in km/h and mph.

The formulas

Pace is the time it takes to cover one unit of distance, so the three values are linked by simple relationships:

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

Speed is the reverse of pace: speed in km/h = 60 ÷ pace in minutes per km. The calculator uses the international mile of exactly 1.609344 km to convert between units.

Worked examples

  • 5K in 25:00: 1,500 seconds ÷ 5 km = 300 seconds, a pace of 5:00 per km. Multiplying by 1.609344 gives about 483 seconds, or 8:03 per mile. The speed is 12 km/h, or about 7.46 mph.
  • Marathon at 8:00 per mile: the marathon is 42.195 km, about 26.22 miles. 26.22 × 8 minutes gives a finish time of about 3:29:45.
  • One hour at 6:00 per km: 60 ÷ 6 = 10 km, or about 6.21 miles.

Good to know

  • Results are rounded to the nearest second, so converting back and forth can differ by a second.
  • Race courses are measured along the shortest possible route. GPS watches usually record a slightly longer distance, so your watch pace may look a little faster than your official pace.
  • Hills, heat, wind and fatigue all slow you down. A pace you can hold for 5K is usually faster than one you can hold for a marathon.
  • The calculator warns you if a pace is faster than 1:30 per km or slower than 60:00 per km, because such values are almost certainly typing mistakes.

Frequently asked questions

What is the difference between pace and speed?

Pace tells you how long it takes to cover one kilometer or one mile, for example 5:00 per km. Speed tells you how far you travel in one hour, for example 12 km/h. They describe the same thing in reverse: a lower pace number means a higher speed.

How long is a half marathon and a marathon?

A marathon is 42.195 km (about 26.2 miles) and a half marathon is exactly half of that, 21.0975 km (about 13.1 miles). The presets in this calculator use these exact distances.

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

Divide the pace per mile by 1.609344. For example, 8:00 per mile is 480 seconds; 480 ÷ 1.609344 is about 298 seconds, or 4:58 per km. The calculator shows both values for every result.

Can I use the pace calculator for walking or cycling?

Yes. The math is the same for any activity. Walking paces are often between 9 and 15 minutes per km. For cycling, the speed in km/h or mph is usually more useful than the pace.