Age Grading Calculator for Runners

Age grading rescales your race time against the standard time for your exact age and sex, so a 55-year-old and a 25-year-old can be compared on one axis. Look up the standard for your age, sex and distance, then enter it with your finishing time in minutes.

The formula

Age-graded percentage = standard time ÷ your time × 100

The standard time is the reference performance for a runner of your exact age and sex at that distance — the time that scores 100%. Because the standard gets slower as age rises, the same clock time is worth a higher percentage at 60 than at 30. We do not reprint the whole table on this page: it runs from age 5 to 100, for both sexes, at every road distance, and it is revised every few years. Read the current value from the source and use the calculator only for the arithmetic.

Reading the percentage

These are the bands USATF publishes:

Percentage	Level
100%	Approximate world-record level for that age and sex
90% and up	World class
80% and up	National class
70% and up	Regional class
60% and up	Local class

The calculator above labels your result with these same bands, so the word it prints and the row you read here are the same claim.

A worked example with real standards

A 45-year-old woman runs 10K in 45:00. In the 2025 road tables her age factor at 10K is 0.9278 against an open standard of 28:46, which puts her age standard at 31:00.

Age grading = 31 ÷ 45 × 100 = 68.9% — local class, closing on regional.

Change only her age and nothing else, and the meaning of that 45:00 moves: at 60 the standard is 36:45, so the same time would score 81.7%, or national class. That is the whole point of the system — and the reason equivalent times across ages can be computed from it.

What it is good for

Masters runners use the percentage to separate two things that absolute time blends together: fitness gained through training and speed lost to age. A finishing time that drifts two minutes slower over five years while the age-graded score climbs is a runner who got fitter. Races use it the other way, to award a “best age-graded performance” alongside the usual age-group podiums.

To see the standards themselves for 5K through the marathon, go to the age-grading tables; for the background on who computes them and why the percentage is also called the WMA percentage, see what age grading is and the WMA age-grading percentage. To track the training behind the score, the heart rate zone calculator covers the intensity side.