What Is Age Grading? A Runner’s Guide to Age-Graded Scores

Two runners cross the same finish line in 22 minutes. One is 25, the other is 68. Who ran the better race? On the clock they're identical — but anyone who has run for a few decades knows those two performances are worlds apart. Age grading is the tool that lets you compare them fairly.

What age grading actually measures

Age grading expresses your finish time as a percentage of the best possible time for your age and sex over that distance. The closer you are to the world-record level for your age, the higher your percentage. A 100% score means a world-record-equivalent performance.

Because the comparison is always against an age-and-sex-specific standard, a 70-year-old and a 25-year-old can both score, say, 75% — and that genuinely means they ran equally strong races relative to what's humanly possible at their age.

How the calculation works

There are two numbers behind every age-graded result:

• The age standard — the approximate world-best time for your exact age, sex and distance.
• The age factor — a number (at most 1.0) that scales your time back to an open-age equivalent.

Your age-grade percentage is simply the age standard divided by your time, times 100. Your age-graded time is your finish time multiplied by the age factor — in other words, what your run is “worth” if you were in your physical prime. These standards come from the World Masters Athletics (WMA) tables, which our age grading calculator applies for 5K, 10K, half marathon and marathon.

What counts as a good age-grade score?

As a rough, widely used guide:

• 60%+ — a solid, healthy local-level performance.
• 70%+ — regional class; you're a competitive club runner.
• 80%+ — national class.
• 90%+ — world class.

Most committed recreational runners land somewhere between 50% and 70%, and watching that number climb as your training improves is far more motivating than chasing a raw time that will inevitably slow with age.

Why runners love it

Age grading turns “I'm getting slower” into “am I getting slower than I should be?” — a much more useful question. It lets you compare a 5K to a marathon, compare yourself to a friend of a different age, and track real progress across years even as your absolute times change. It's also a great reality check before a goal race: pair it with a race time predictor to set targets that are ambitious but realistic.

Find your score

Enter your sex, age, event and finish time into the age grading calculator to get both your age-grade percentage and your age-graded time in seconds. It's free, instant, and uses the official WMA standards.