Fitness

Marathon Split Calculator

Calculate 5 km, 10 km, halfway, and finish split times from a goal time.

Updated: May 15, 2026

Input

Calculate major split and elapsed times from a race goal time.

Result

04:59/km

Average pace

5 km5 km24:5324:53
10 km10 km24:5349:46
15 km15 km24:5301:14:39
20 km20 km24:5301:39:32
Halfway21.098 km05:2801:45:00
25 km25 km19:2502:04:25
30 km30 km24:5302:29:18
35 km35 km24:5302:54:11
40 km40 km24:5403:19:05
Finish42.195 km10:5503:30:00

Use this as a guide and adjust for your real conditions.

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How to use

  1. Enter Goal time, Distance.
  2. Check the estimate in the result area.
  3. Share a reproducible URL if needed.

How to read the result

  • Read Split times, Elapsed times as quick decision-making estimates.
  • Do not treat the result as a fixed answer; adjust assumptions to see the range when needed.

Useful tips

  • Useful when you want to build a full marathon pace table; adjust inputs to compare scenarios.
  • Useful when you want to check half marathon split targets; adjust inputs to compare scenarios.
  • Use results as training guides and adjust for condition, heat, surface, and fatigue.
  • If the result feels too demanding, reduce distance, intensity, or duration and recalculate.

Calculation

The tool calculates training estimates from distance, time, and heart-rate inputs.

Notes

  • Adjust for your condition and environment.
  • This is not medical or coaching advice.
  • Stop exercising if you feel pain or discomfort.

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FAQ

Are inputs saved?

Inputs are calculated in your browser and are not sent to a server. When you use sharing, the reproducible URL includes the current conditions.

Are results exact?

Use results as everyday estimates. For exact decisions, confirm with official or specialized sources.

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