Half Marathon Age-Graded Calculator
So you ran a half. Enter the time, your sex and your age on race day and see what it is worth against the world best for that age. The half marathon is the distance most masters runners race most often, which makes its age grade a useful season benchmark.
Your race
Age-graded percentage
Enter your chip time and age at race to see your age-graded percentage, the open-class equivalent time, and the time you’d need today to match it.
What is a good half marathon time for my age?
The standards pages list the finish time that scores 50, 60, 70, 80 and 90% at every age from 18 to 99, straight from the same tables this calculator uses.
Questions
What is a good half marathon time for my age?#
A 50-year-old man reaches 70% with 1:32:44 and 80% with 1:21:09. A 50-year-old woman needs 1:42:36 for 70% and 1:29:47 for 80%. The half marathon standards page lists every age and tier.
Does a fast course change the age grade?#
No. Age grading corrects for age and sex, not for elevation, wind or temperature. A downhill half grades the same as a flat one. That is a known limit of the method, and it is why the record book asks whether a course was certified.
Which tables does this calculator use?#
Road results are graded with the Alan Jones 2025 tables, approved by the USATF Masters Long Distance Running Council in January 2025. Track uses WMA 2023. Both are single-year age tables, so the result reflects your exact age on race day rather than a five-year bracket.
What counts as a good age-graded percentage?#
The usual shorthand is 60% local class, 70% regional class, 80% national class and 90% world class. In a big-city marathon field roughly one finisher in eighty reaches 80%. Anything above 70% puts you in the sharp end of most races.