Running Pace Calculator

Pace per km and per mile, speed, and projected times from a distance and time.

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About this calculator

Runners plan in pace — minutes per kilometre or mile — but races give you distance and finishing time. This calculator converts between them, shows your speed, and projects the same pace across common race distances so you can sanity-check a target: if your 5K pace projects to a marathon time you've never approached, the target needs work.

The formula

Pace = Time ÷ Distance Speed = Distance ÷ Time Projected time = Pace × new distance

Worked example

5K in 27:00: pace 5:24 /km (8:41 /mile), 11.11 km/h — projecting 54:00 for 10K at the same pace.

Common mistakes

Assuming race pace holds across double the distance — endurance fades; projections are best-case.
Confusing pace (min/km) with speed (km/h) on treadmill displays.
Setting a target pace from your best-ever run rather than a recent typical one.

Frequently asked questions

Divide the target by the distance for the required pace, then hold it with a watch or the km markers — even pacing beats fast starts.

Enormously variable: 30+ minutes is a strong start for new runners, ~25 is a common club-entry level, sub-20 is competitive. Your trend matters more than the table.

It isn't — 1 mile = 1.60934 km, and the calculator uses the exact factor.

Assumptions & limitations

Constant pace; real races involve fade, hills and crowds.

Sources & verification

This calculator applies the standard formula published above to the figures you enter — it relies on no external statutory data. The formula and the worked example were checked by hand against each other.

Formula last verified: 24 July 2026

Maintained by: Steve Davis, Founder & Editor — see our editorial standards

Spotted an error or an out-of-date figure? Report it — corrections are prioritised over all other work (see our corrections policy).