Running tools

Simple, free calculators to plan your runs and races. No account needed, right in your browser.

Pace ↔ speed converter
Convert a pace in min/km to a speed in km/h, and back.
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Race time calculator
How long a 5K, 10K, half or full marathon takes at your pace.
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Goal pace and splits
The pace you need for your goal time, with your splits.
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Race time predictor
Estimate your times from 5K to marathon from a recent race.
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