Age-Graded Race Performance Calculator

Age grading compares a race result against the best possible time for a person of the same age and sex over that distance. It produces a percentage: 100% is the world-record-level standard for your age group, and higher percentages mean a better performance. Age grading lets a 60-year-old and a 25-year-old compare results fairly.

Age-graded percentage equals the age-group standard time divided by your actual time, multiplied by 100. The standard time is the open (peak-age) world standard adjusted for your age using the official age factor. If your time equals the standard, you score 100%. A faster time scores above 100%; a slower time scores below.

World Masters Athletics publishes the official age-grading tables of standard times and age factors by sex, age, and distance. Because those tables are large and updated periodically, this calculator takes the standard time and your age factor as user-editable inputs that you copy from the current official tables, rather than hardcoding values.

The age-equivalent open time estimates what your performance would be worth if you were at peak age. It equals your actual time multiplied by your age factor (a number at or below 1.0). This lets you compare your result directly against open-class times regardless of your current age.

As a rough guide used in masters athletics, above 90% is world-class, 80 to 90% is national class, 70 to 80% is regional class, and 60 to 70% is local class. These bands are conventions, not official thresholds, and vary slightly by source.