Start here: age-graded running explained

If you are new to age grading, start with this simple idea: the clock tells you what happened, but it does not explain the age-group context behind the performance.

TruePace Run helps with that second part. You enter one race result, age and gender, and the calculator estimates an age-graded percentage and age-adjusted equivalent time using sourced road-running standards.

What age grading is

Age grading compares a runner's finish time with a reference standard for the same distance, age and gender. The output is usually shown as a percentage. A higher percentage means the performance is closer to the reference standard.

That makes age grading useful when raw times are too blunt. A 25-minute 5K at 25 and a 25-minute 5K at 65 are both 25 minutes, but they are not the same age-group performance.

When to use it

• Comparing your current results with old personal bests.
• Understanding whether a result is strong for your age group.
• Comparing friendly club or family results across different ages.
• Adding context to 5K, 10K, half marathon and marathon performances.

It is especially useful for masters runners, because the raw clock can make every year feel like a slow negotiation with gravity. Age grading does not make the race easier, but it can make the interpretation fairer.

How to use the calculator

• Choose the race distance.
• Enter the finish time exactly as it appeared on the clock.
• Enter age and gender.
• Read the pace, age-graded percentage, age-adjusted equivalent time and source note together.

Do not start by hunting for the most flattering interpretation. Start with the raw result, then add the age-graded context. That keeps the number useful rather than decorative.

A quick example

Imagine two female runners both complete 5K in 30:00. At age 40, the current calculator estimates that as 48.8% age graded, with an age-adjusted equivalent of about 28:30. At age 60, the same raw time estimates at 60.8%, with an age-adjusted equivalent of about 22:52.

The point is not that one runner secretly ran a different distance. The point is that the same clock time sits in a different age-group context. That is the whole job of age grading: keep the raw result, then add a fairer lens.

What to read next

If you want the short explanation, read What is age grading in running? If you want to understand the output fields, read How to interpret your age-graded result. If you want to know what a good percentage means, read the percentage guide. If you are comparing two people, read the guide on comparing runners of different ages.

A runner's judgement checklist

Before you decide what the number means, ask a few ordinary runner questions. Was the course comparable? Was the day hot, windy or crowded? Were you racing flat out or using the event as part of training? Was this a comeback run, a social run or a genuine target race?

Those questions matter because age grading is best used alongside judgement. The number gives structure to the comparison. It does not know whether you slept badly, paced a friend, stopped to tie a shoelace or ran the first kilometre as if chased by poor decision-making.

Limitations to keep in mind

Age grading does not know the weather, hills, course surface, race congestion, pacing choices, training block, sleep, health or whether you spent kilometres three to seven regretting your life choices. It is a useful estimate, not a full explanation of the race.

TruePace Run is independent from parkrun, WMA, USATF, race organisers and timing providers. Results are informational estimates, not official rankings.

If this is your first visit, the best next step is simple: calculate one recent race you remember clearly. A meaningful result is easier to interpret than an abstract example, and it keeps the calculator tied to running reality rather than spreadsheet theatre.