🏃 Running Pace Calculator

Calculate pace, time, or distance — plus splits and race time predictions.

Pace Calculator

Speed Converter

Pace (min/km)

min/km

Split Calculator

Total Time (hh:mm:ss)

Race Distance

Split Type

Race Time Predictor

Uses the Riegel formula: T₂ = T₁ × (D₂/D₁)^1.06. Enter a known race result to predict other distances.

Known Distance

Your Time (hh:mm:ss)

Running Pace Formulas

Pace = Total Time ÷ Distance. Time = Pace × Distance. Distance = Total Time ÷ Pace.

Negative splits mean running the second half of a race faster than the first. Research shows negative-split strategies lead to faster finish times for most runners.

Riegel Formula: T₂ = T₁ × (D₂/D₁)^1.06. The exponent 1.06 accounts for the fact that longer races are disproportionately harder. Predictions are most accurate when predicting distances within 2× the known distance.