How it works
Age-graded % = open-class standard ÷ (your time × age factor) × 100
Each combination of sex, event, and single year of age has a published factor no greater than 1.0. Multiplying your finish time by that factor produces the age-graded time — what the run is worth in open-class terms — while dividing the open world-standard time by your actual time gives the percentage, where 100% marks world-record level for your demographic. The numbers come from the WMA/USATF 2025 road tables maintained by Alan Jones: 5K, 10K, half marathon, and marathon factors are fitted directly from the data, and the 15K and 10 mile factors come from interpolation between neighboring fitted events, as the source specifies.
Sources
- WMA/USATF age-grading tables (2025 road edition) Alan Jones, Age-Grade-Tables (single-age road factors; the dataset USATF Masters adopted, approved 2025). Public domain.
- USATF Masters — age grading USA Track & Field Masters Long-Distance Running: age-grading method and performance-class thresholds (world/national/regional/local class).
- World Masters Athletics WMA, originator of the age-graded tables (WAVA/WMA Masters Age-Graded Tables, periodically revised).
FAQ
What counts as a good age-graded score?
USATF Masters reads the scale this way: 90% and up is world class, 80% national class, 70% regional class, and 60% local class, with 100% equal to a world-record-level run for your age and sex. Committed club runners typically score somewhere between 60% and 75%.
Which inputs change the score most?
Age and event drive the factor, so get both exactly right — the tables step by single year of age rather than five-year bands, and every distance has its own curve. Use your age on the day you raced and your official chip time; one birthday or a different event can move the factor noticeably.
Which age-grading tables does this tool use?
The 2025 road edition of the WMA/USATF tables compiled by Alan Jones — the dataset USATF Masters adopted — covering every single age from 5 to 99 for both sexes. Calculators still running the 2015 or 2020 editions will show slightly different percentages for the same race.
Why does another calculator give a different percentage?
The tables get revised as records improve — editions appeared in 2010, 2015, 2020, and 2025 — and road factors differ from track factors. Two tools built on different editions will disagree by a point or two, so check which edition the other one cites before worrying about your fitness.
Which race distances can I grade here?
Six common road events: 5K, 10K, 15K, 10 mile, half marathon, and marathon. Track races use separate tables and are not covered, so grade a road result rather than a track time if you want the score to mean what the tables intend.
Can I compare my 5K against my marathon with the score?
Yes — that comparison is the whole point. Every event is graded against its own standard, so equal percentages mean equally strong runs: a 72% marathon and a 72% 5K sit at the same level even though the raw times look nothing alike. The score also tracks fitness across the years as the factor moves with your age.
Age grading is a statistical comparison, not an official result: the factors are population standards that WMA and USATF revise every few years, and this tool applies the 2025 road tables. Use the score for benchmarking and motivation, not for record claims or health decisions.