Marathon Time Calculator

The pace a finish time needs, and back again.

FREE · NO SIGN-UP · RUNS ON YOUR DEVICE

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  • 3THINGS SOLVED
  • 4RACE DISTANCES
  • 0SIGN-UP
  • 1TAP TO COPY
Specification

Marathon Time Calculator at a glance

Marathon distance
42.195 km preset
Solves for
Both directions
Pace shown
Per km and per mile
Shorter races
Half, 10K and 5K
Time format
h:mm:ss and mm:ss
Price
Free
Account required
None
Where it runs
On your device
How to

How to use Marathon Time Calculator

  1. 1

    Choose the direction

    Choose the direction.

  2. 2

    Select marathon

    Select marathon.

  3. 3

    Read the answer

    Read the answer.

Questions

Frequently asked questions

What pace do I need for a four hour marathon?

Choose pace as the answer, select marathon, and enter 4:00:00. The pace per kilometre and per mile appear together.

Will my half marathon pace hold for a full one?

Usually not. Most runners slow over the second half of a marathon, so treat a converted half time as an optimistic ceiling.

How long is a marathon exactly?

Forty-two point one nine five kilometres, or 26.219 miles. That exact figure is used here rather than a rounded one.

Can I use it for a half marathon?

Yes. Change the distance to half marathon and every figure updates, including the shorter race times underneath.

Background

Holding a marathon pace

Pick marathon as the distance, then work out either direction: the time a pace produces, or the pace a target time demands. Shorter races are listed underneath.

  • Five seconds a kilometre over 42 kilometres is about three and a half minutes on the finish time.
  • Most finish times are set by the second half, where an early fast pace is paid back with interest.
  • Course profile and heat move a real finish time more than small differences in target pace do.
  • Checking pace at every kilometre rather than every mile keeps the arithmetic simple mid-race.

Full specification

Specification of the Marathon Time Calculator tool
Marathon distanceForty-two point one nine five kilometres, preset.
Solves forFinish time from a pace, or the pace a target time needs.
Pace shownPer kilometre and per mile, alongside speed in kilometres per hour.
Shorter racesHalf marathon, ten kilometres and five kilometres at the same pace.
Time formatHours, minutes and seconds for times; minutes and seconds for pace.
PriceFree. Supported by clearly labelled ads placed outside the working area.
Account requiredNo.
Where it runsIn your browser tab. Nothing is sent anywhere.
Next step

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