Purdy Points Calculator

About this calculator

The Purdy Points system, developed by statistician John Purdy, scores a running performance by comparing an athlete’s time for a given distance to a standard (world-class) time for that same distance, converting the comparison into a points value on a common scale — commonly capped near 1000 for a standard-setting performance and scaling down from there as the ratio of actual time to standard time grows.

Because the scoring accounts for the standard time associated with each specific distance, Purdy Points let coaches and athletes compare performances across completely different race distances — a 5K time and a marathon time — on the same numerical scale, which is useful for club scoring systems, age-grading style comparisons, and all-around or multi-event competitions where a single combined score is needed. This calculator takes your time and the relevant standard time and returns the resulting Purdy score.