Sports & Performance tool map

Running & endurance

Pace, distance, race, and endurance estimates.

Choose the tool whose inputs and output match your task. Check each calculator’s assumptions and limitations before using its result.

Half Marathon Pace Calculator

Calculate half marathon pace from a target finish time, including mile and kilometer paces and even cumulative splits.

Convert pace and speed between min/km, min/mile, km/h, and mph using the exact international mile conversion.

Calculate running pace, elapsed time, or distance in miles or kilometers using exact unit conversion.

Estimate step length from a measured distance and repeated counted-step trials.

Calculate average swimming speed, pace per 100 meters, equivalent pool lengths, and constant-pace projected times.