Tools
Running tools
Pace, race predictions, heart-rate zones and mountain finish estimates — free, in the browser, with named formulas.
Marathon pace calculator
Finish time ↔ pace and kilometre splits.
OpenRace predictor
One recent race → times at other distances and Daniels training paces.
OpenHeart-rate zones
Five heart-rate zones from age and resting pulse.
OpenMountain finish
Add elevation gain to estimate time on courses like Seven Lakes.
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