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PAC

Running Pace Calculator

Mutually calculate running pace, distance, and finish time (km / miles).

S'exécute dans votre navigateur — les données ne quittent pas votre appareil

Choose what to solve for, enter the other two values, and switch units between km and miles.

Solve for
Units
Distance presets
Pace
5:00/km
Pace
5:00/km
8:03 /mi
Time
25:00
Distance
5 km
Speed
12.00km/h
7.46 mph
Predicted times at this pace
  • 400 m2:00
  • 1 km5:00
  • 1 mile8:03
  • 5K25:00
  • 10K50:00
  • Half1:45:29
  • Marathon3:30:59

Uses the international mile (1 mi = 1609.344 m) and official road marathon distances (42.195 km / half 21.0975 km). Elevation, course measurement error, and GPS drift are not modeled. Predicted splits assume even pacing — not a guaranteed race result.

À propos de Running Pace Calculator

Running plans trade off distance, finish time, and pace (time per kilometer or mile). This calculator lets you solve for any one of the three from the other two. Switch between metric and miles, then tap race presets — 400 m, 1 km, 1 mile, 5K, 10K, half marathon (21.0975 km), and marathon (42.195 km). Results include speed in km/h and mph plus even-pace split predictions for those distances. All calculation runs in your browser. Elevation, course measurement error, GPS drift, and fatigue are not modeled — use the numbers as a planning aid, not a guaranteed race result.

Comment l'utiliser

  1. Choose what to solve for (pace / time / distance)
  2. Pick units and enter the other two values (presets for distance)
  3. Review the result, speed, and predicted split times

FAQ

What is pace?

Time per kilometer or per mile (e.g. 5:00 /km). The result also shows the equivalent in the other unit.

How do I enter time?

Use m:ss (e.g. 25:00) or h:mm:ss (e.g. 1:30:00). A plain number of seconds also works.

Are half / marathon distances exact?

Yes — official road distances (half 21.0975 km, marathon 42.195 km) and the international mile (1609.344 m).

Is my data sent anywhere?

No. All calculation runs in your browser; nothing is sent to toco.tools servers.