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Running pace calculator

Pace, finish time or distance, plus race time predictions

  • Runs in your browser
  • Free
  • No sign-up
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How to use it

  1. Enter your numbers.
  2. The result updates as you type.
  3. Change any value to see a different outcome.

Questions

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

Multiply the pace per kilometre by 1.609. A 5:00 min/km pace is 8:03 min/mile.

How are the race predictions worked out?

They use the Riegel formula: new time = old time × (new distance ÷ old distance)^1.06. It assumes you train properly for the longer distance, so treat it as a guide.

Is anything I enter stored?

No. Calculations happen in your browser and nothing you type is sent or saved.

Is it free?

Yes, you can use it for free. A subscription removes limits and unlocks premium tools.

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