The race time calculator multiplies pace × distance at steady speed—handy for 5K, half, full, or custom routes.
How to use
- Choose units; enter distance or a preset.
- Enter target pace (min/sec per km or mile).
- Read finish time; after a run, back-solve pace on the pace calculator.
Example
10 km at 5:30/km → 55:00 total. Half marathon 21.1 km at 6:00/km → ~2:07 (rounded).
Real races add fuel, weather, and pacing strategy.
Frequently asked questions
How is finish time calculated?
Assuming steady pace: finish time = pace (per km or mile) × distance. Enter distance and pace min/sec to see total time, in km or miles.
Vs pace calculator?
The pace calculator also finds pace from a known finish time. This page targets race prep: “If I hold this pace, how long for this distance?”
Negative splits?
No—this assumes one pace for the whole route. Negative or positive splits will differ from the estimate.
Preset race distances?
Presets use common standard distances (e.g. ~21.1 km half, ~42.2 km full). For certified course quirks, type the exact distance.
Pace in minutes per mile?
In mile mode, pace is min/mile; the math converts internally so equivalent inputs match km mode for the same steady speed.
Tie to heart rate zones?
Pace links to effort, but fuel, weather, and hills matter too. Cross-check age-based zones on the target heart rate calculator.
Can I save distance and pace?
Yes—enter distance and pace (and units), then Copy link below the form to save or share the setup.