Running Pace Calculator

This calculator converts your run's distance and time into pace (minutes per km or mile) and speed (km/h or mph), then projects finish times for common race distances.

Pace is computed by dividing your total time in seconds by the distance covered. Speed is the inverse relationship, distance divided by time, converted to an hourly rate. Race predictions multiply your per-unit pace by each race's standard distance.

Example: Running 5km in 25 minutes gives a pace of 5:00 min/km and a speed of 12 km/h. At that same pace, a 10K would project to around 50:00, and a half marathon to about 1:45:29.