Pace Converter: free pace and speed calculator.

Type a pace or a speed in any unit. See every other unit at once, and your finish time over the classic distances.

Your numbers

Type in any box. Paces as m:ss, speeds as a number.

At this pace

Per km

5:00

Per mile

8:03

  • 5K25:00
  • 10K50:00
  • Half marathon1:45:29
  • Marathon3:30:59

12 km/h · 7.46 mph · 0:30 per 100 m

Hand it to your AI

Your AI can check these numbers against your training and adjust them. The prompt has your results filled in.

See the prompt

My pace is 5:00 min/km: that is 5:00 per km, 8:03 per mile, 12 km/h. At that pace: 5K 25:00, 10K 50:00, Half marathon 1:45:29, Marathon 3:30:59. Look at my recent sessions and tell me which race this pace suits, and how to build my training paces around it.

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Gemini, Grok Bot, Dots, Muse and Cue: copy the prompt and paste it in.

See the card

Your AI could check this against your real training. Join Memory.fit.

On Android now: get it on Google Play. One email when the iPhone app is on the App Store.

How it works

How the Pace Converter works.

Pace is time per distance, speed is distance per time, and they are two sides of the same number. Runners think in minutes per kilometer or mile, cyclists in km/h or mph, swimmers in time per 100 meters.

Type any one of them and the converter works out the rest, plus how long the 5K, 10K, half marathon and marathon take at that pace.

The formula

  • min/mile = min/km × 1.609
  • km/h = 60 ÷ min/km
  • mph = km/h ÷ 1.609

Example

A worked example.

A runner holding 5:00 per kilometer.

  1. 15:00 per km is 8:03 per mile, 12 km/h and 7.46 mph.
  2. 2At that pace: 5K in 25:00, 10K in 50:00, a half marathon in 1:45:29 and a marathon in 3:30:59.

Questions

Pace Converter: questions.

  • Multiply by 1.609. A 5:00 per km pace is 8:03 per mile.

  • 5:41 per km, or 9:09 per mile, held for 42.2 km. Most runners aim a few seconds faster to leave room.

  • Divide 60 by the speed. 12 km/h is 5:00 per km.

  • It depends on your level and the distance. Time a steady 400 m, divide by four, and type that in to see it as a speed and a pace for your race.

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Not medical advice. These numbers come from published research on groups of athletes. Your own needs can differ; talk to a doctor or a sports dietitian about any health condition.