Running Age-Grading Calculator

The Running Age-Grading Calculator turns your race time into an age-grade percentage — a single number that shows how your run compares with the world standard for a runner of your exact age and sex. Because it corrects for both age and distance, age grading is the fairest way to compare performances: a 68-year-old and a 24-year-old, or a mile and a marathon, can be measured on the same scale. This tool also gives your age-graded (open-equivalent) time, your performance level, an age-factor curve, and the equivalent times you could run at other ages to hold the same grade.

What is Age Grading?

Age grading was developed by World Masters Athletics (WMA) to let runners of any age and sex compare their performances fairly. Instead of just looking at raw time, it asks: how close is this run to the best a person of your age and sex could theoretically achieve? The answer is expressed as a percentage, where 100% represents world-record standard for your age group.

Age Grading Formula

Age grading combines a per-distance world standard with an age factor for your exact age and sex.

The age factor is a number no greater than 1.0 that peaks between about 20 and 30 years of age and declines on either side. Multiplying your time by it produces an "open-class" equivalent — the time your performance would be worth in your athletic prime. Dividing the world standard by that equivalent gives your age grade as a percentage.

Age Grade Performance Levels

Why Age Grading Beats Raw Time

Raw finish times punish older and younger runners for factors outside their control. A 55-year-old who runs a 21:00 5K may look "slower" than a 30-year-old who runs 19:30, yet after age grading the 55-year-old often scores higher — because their time is closer to what is physically possible at their age. Age grading rewards quality relative to potential, which is why it is used to rank age-group awards, seed race results, and track your own progress as you get older.

What Affects Your Age Factor?

How to Use This Calculator

1. Enter your details: Select your sex and enter your age at the time of the race.
2. Choose your distance: Pick your event, from the mile up to the marathon.
3. Enter your finish time: Type the hours, minutes and seconds you ran.
4. Click Calculate: See your age-grade percentage, age-graded time, performance level, an age-factor curve with your age marked, and the equivalent times to hold the same grade at other ages.

Frequently Asked Questions

What is age grading in running?

Age grading converts a race time into a percentage that shows how it compares with the world standard for a runner of the same age and sex over the same distance. It lets you compare performances fairly across different ages, sexes and distances, so a 60-year-old and a 25-year-old can see who ran the better race relative to their potential.

How is age grade calculated?

First an age factor for your exact age and sex is looked up. Your age-graded (open-equivalent) time equals your time multiplied by that factor. Your age grade percentage equals the open-class world standard for the distance divided by your age-graded time, times 100. Equivalently it is the world standard for your age divided by your actual time.

What is a good age grade percentage?

Above 90 percent is world class, 80 to 90 percent is national class, 70 to 80 percent is regional or strong club level, 60 to 70 percent is local class, and below 60 percent is a solid recreational performance. Reaching 100 percent means you ran at world-record standard for your age and sex.

What is an age-graded time?

Your age-graded time is your finish time scaled to an open-class (prime-age) equivalent using your age factor. It answers the question: what time would this performance be worth if you were in your athletic prime? It is useful for comparing your own results as you get older.

Does age grading work for young runners?

Yes. Age factors also account for junior runners who have not yet reached full physical maturity, so a strong run by a teenager can still earn a high age grade. Factors peak between roughly 20 and 30 years of age and decline on either side.

Are the standards the same as world records?

The open-class standards used here are approximate world-best times for each distance, and age standards are derived from them using the age-factor tables. They are periodically updated reference values, so an age grade slightly above 100 percent is possible when someone runs faster than the current standard for their age.

Additional Resources

• Age Grading (Running) - Wikipedia
• World Masters Athletics - Wikipedia