Running Pace & Race Predictor

Work out pace, finish time or distance, get splits, and estimate race times from a recent result.

Distance and pace units

Pace calculator

Solve for

Distance (mi)

Time

HoursMinutesSeconds

Pace (min / mi)

MinutesSeconds

Results

Pace8:03 /mi

Pace: —
Finish time: —
Distance: —
Speed: —

Treadmill: —

Treadmill table

Approximate belt speed and resulting pace. No incline adjustment.
Setting	Pace / mi	Pace / km

Splits

Times are rounded individually, so split times may differ from the total by a second.

Split pattern

Split times and elapsed time for each distance mark.
Split	Split time	Elapsed

Race predictor

Enter one recent result to estimate times for other distances.

Recent distance (mi)mi

Recent time

HoursMinutesSeconds

Advanced

Riegel exponent

Higher values predict slower times at longer distances.

Predicted race times

Estimated with Riegel's formula: T2 = T1 × (D2 ÷ D1)^1.06.

Add a custom target distance (mi)

Predicted finish time and pace for each race distance.
Distance	Predicted time	Pace / mi	Pace / km	Use

These are estimates from one result. They assume similar fitness and effort at every distance and are least reliable for big jumps, such as 5K to marathon.

Riegel, P. S. (1981), “Athletic Records and Human Endurance,” American Scientist 69(3): 285–290.