15K Age-Graded Calculator
The 15K sits between the 10K and the half and has its own factor table, so there is no need to convert it to something else first. Enter the time, your sex and your age on race day and see where it lands.
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 15K 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
Why grade a 15K instead of converting it to a 10K?#
Conversion formulas assume a fatigue curve that is only roughly right for you. The Alan Jones 2025 tables carry a dedicated 15K open standard and age curve, so grading the race directly avoids stacking one estimate on another.
What is a good 15K time for my age?#
A 40-year-old man reaches 70% at 59:40 and 80% at 52:12. A 40-year-old woman needs 1:05:08 for 70% and 56:59 for 80%. The 15K standards page has the full table by age.
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.