How it works
Age-graded % = open-class standard ÷ (your time × age factor) × 100
Every sex, distance and single year of age has a published **age factor** — a multiplier at or below 1.0. Your **age-graded time** is your finish time multiplied by that factor, which scales the performance to its open-class (prime-age) equivalent. The **age standard** is the open-class world-record-level time divided by the same factor — the ideal time for someone your age and sex. Your **age-graded percentage** is that standard divided by your actual time: 100% is world-record level, and the number falls as your time rises. This calculator uses the official WMA/USATF 2025 road tables maintained by Alan Jones; 5K, 10K, half marathon and marathon are fitted directly, while 15K and 10 mile are interpolated between them per the same source.
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 is a good age-graded score?
On the USATF Masters scale: 90%+ is world class, 80%+ national class, 70%+ regional class, 60%+ local class, and below that is solid recreational running. 100% means a world-record-level performance for your age and sex. Most competitive club runners land in the 60–75% range.
How is age grading calculated?
Your time is multiplied by an age factor (a published number ≤ 1 for your sex, distance and exact age) to get an open-class equivalent time. Your percentage is the world-record-level standard divided by that equivalent time, times 100. The factors come from decades of masters performance data.
Which tables does this use?
The WMA/USATF 2025 road-running tables maintained by Alan Jones — the same dataset USATF Masters adopted. They cover single years of age from 5 to 99 for both sexes.
Why does my percentage differ from another calculator?
The tables are revised every few years (2010, 2015, 2020, 2025) as world records and age-group bests improve, so a calculator on an older edition will give a slightly different number. This tool uses the 2025 road edition. Track-event tables also differ from road tables.
Does age grading work for any distance?
It is defined for standard events. This calculator covers the common road races — 5K, 10K, 15K, 10 mile, half marathon and marathon. The 5K, 10K, half and marathon are fitted directly from the data; 15K and 10 mile are interpolated between the fitted distances, exactly as the source tables specify.
Can I compare a 5K to a marathon with this?
Yes — that is the point. Because every distance is graded against its own age/sex standard, the percentages are comparable: a 72% 5K and a 72% marathon are equally strong performances for you, regardless of your age.
Age-graded factors are statistical standards revised periodically by WMA/USATF; this tool uses the 2025 road edition and is for comparison and motivation, not official record certification. Times are for road events measured per standard course rules.