Age Grade Calculator

An age grade is a percentage that compares your race time with the best time on record for a runner of your age and sex over the same distance. It lets a 65-year-old and a 25-year-old compare their races on one scale. The calculator needs four things: your sex, your age on race day, the race distance and your finish time.

What an Age Grade Measures

An age grade of 100% means you matched the best known time for your age, and 50% means you took twice as long as that time¹. The standards are built from single-age bests, the fastest road times recorded at each age, so the score tells you how close you came to the best performance for someone like you². It is a measure of race performance, not of health or fitness on its own.

The Formula

Age-graded time = your finish time x age factor

Age grade (%) = open class standard / age-graded time x 100

The age factor is a number of 1.0 or less for your age, sex and distance. The open class standard is the best time at any age, and for the 5K, 10K, half marathon and marathon it is the road world record at the time the tables were made². Age grading began with tables published in 1989 with the World Association of Veteran Athletes, and the current road tables by Alan Jones were approved by USA Track and Field's Masters Long Distance Running Council in January 2025¹.

How This Calculator Computes Your Result

Choose female or male, enter your age in whole years (5 to 100), pick one of 22 road distances from 1 mile to 200K, and enter your finish time in hours, minutes and seconds. The calculator looks up your age factor in the 2025 tables³, multiplies your time by it, and divides the open class standard by the result. You see your age grade to two decimal places, your age-graded time to the nearest second, your level, and the times you would need at your age to reach 60, 70, 80, 90 and 100%.

For example, a 50-year-old man who runs a 10K in 40:00 has an age factor of 0.8886³. His age-graded time is 35:33, and his age grade is 74.27%, which is regional class.

What Your Result Means

World Masters Athletics groups age grades into these levels⁴:

These levels describe the standard of the performance, not how healthy you are. A score above 100% is rare, so it is worth checking that the time, age and distance were entered correctly.

Why Age Grades Change With Age, Sex and Distance

Endurance performance holds steady until about age 35, declines slowly until about 50 to 60, and then falls faster⁵. The main reason is a drop in VO2 max, the most oxygen the body can use, along with a lower lactate threshold⁵. The tables follow this curve. For men at 5K, the age factor is 0.9475 at age 40, 0.8075 at 60 and 0.6191 at 80³.

Women and men have separate tables because the best times at each age differ between the sexes. A 30:00 5K at age 70 scores 69.67% for a woman and 58.10% for a man³. Distance matters too. For men, the 5K factor stays at 1.0 from age 19 to 29, while the marathon factor stays at 1.0 from 22 to 35³.

Common Mistakes When Comparing Age Grades

A common mistake is comparing scores made with different tables. The road tables were revised in 2010, 2015, 2020 and 2025¹. A 50-year-old woman who runs a 3:45:00 marathon scores 64.18% with the 2025 tables and 67.16% with the 2020 tables, because the women's marathon record and the age factors changed³. Race results and other websites may still use an older edition.

Other mistakes are using road tables for a track race (track events have separate tables¹), using your current age instead of your age on race day, and comparing a hilly or hot race with a flat, cool one. The tables assume a normal road course and do not adjust for weather, hills or a course that was short or long.