Age-Grade Calculator

What age grading actually tells you

Your age-grade percentage compares your time to the best time anyone your age and sex has run at that distance — the age standard. Scoring 100% would mean you matched the age-group world best; the open-class standard itself is the sport's record-level performance. Because the standard is adjusted for age, a 3:10 marathon at 58 can represent a better performance than a 3:00 at 30, even though the clock says otherwise.

That's why it's such a useful yardstick for masters runners: it measures whether your training is working relative to your own age curve, instead of holding you to the times you ran a decade or two ago. The "open-class equivalent" above translates your result into the time a peak-age runner would need to match your age-graded performance.

How to read your score

• 90–100% World class
• 80–90% National class
• 70–80% Regional class
• 60–70% Local class
• <60% Keep building

For most competitive masters runners, the 60–80% band is home, and a Boston-qualifying performance tends to land around 63–70% age-graded depending on the age group. If you want the full story on how those standards work in your favor, read Boston Qualifying as a Masters Runner.