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Race Finish Time Calculator

How long will my 5K take?

Enter a pace you know, or a recent run, to see the finish time for a race at that steady pace.

One Click Answers · Race Finish Time Calculator
oneclickanswers.com/race-finish-time-calculator · Printed
About this tool & how to use it

What it does

Estimates your finish time for a mile, 5K, 10K, half marathon, marathon or your own distance at a steady pace you know or from a recent run.

How to use it

  1. Choose whether you know a pace or a recent run, and enter it.
  2. Pick the race distance, or enter your own.
  3. Read the finish time first, then every standard distance at the same pace.

One click answer

Your answer will appear here.

Fill in the form and your answer appears here as you type.

Assumptions

  • The pace is held for the whole distance, which real races rarely do.
  • Course, weather, training and the day change the real result.
  • It is an estimate and not a prediction.

Printed from oneclickanswers.com. Results are estimates based on what was entered; see the assumptions above.

How it works

Finish time = pace x distance. At 8:03 per mile, a half marathon (13.109 miles) is about 1:45:29.

A recent run is turned into a pace first (time divided by distance).

The standard distances use their exact lengths: 5K, 10K, 13.1094 miles and 26.2188 miles.

Formulas and details
  • Finish time = pace x distance.

Assumptions

  • The pace is held for the whole distance, which real races rarely do.
  • Course, weather, training and the day change the real result.
  • It is an estimate and not a prediction.

Example

Input: The starting values already in the form

Result: At that pace, a half marathon would take about 1 hour 45 minutes 29 seconds (1:45:29). The pace is 8:03 per mile (5:00 per kilometer), held for the whole distance.

Questions

Is this a race predictor?

No. It holds one pace for the whole distance. A longer race is usually run slower than a short one, and this page does not guess by how much.

Can I use a walking pace?

Yes. Any pace works, including a walking pace.

Last reviewed 2026-10-04.

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