Running Pace Calculator & Race Time Predictor

Calculate your running pace, speed and split times, or predict your race times across 5K, 10K, half and full marathon — all free.

⏱️ Pace Calculator

Distance

Finish time

: :

Pace /km

—

min/km

Pace /mile

—

min/mile

Speed

—

km/h

Split	Cumulative

🔮 Race Time Predictor

Enter a recent race result. We project your other distances (Riegel formula).

Recent race distance

Your time

: :

Race	Predicted	Pace/km

Estimates assume comparable training and conditions. Real results vary with course, weather and endurance.

How is pace calculated?

Pace is your time divided by distance. This tool also converts to min/mile and km/h, and breaks your run into per-kilometer splits so you can plan an even effort.

How does the predictor work?

It uses Riegel's formula: T2 = T1 × (D2 / D1)^1.06. It's a well-known endurance model — accurate for similar effort levels, less so when jumping from very short to very long distances without specific training.