Half marathon age grading explained

The half marathon sits in a useful middle ground. It is long enough to reward endurance and pacing, but short enough that speed still matters.

That makes age grading especially useful. A two-hour half marathon at 30, 50 and 65 is the same raw time, but it is not usually the same age-group performance.

What age grading adds

Your raw half marathon time tells you what happened on the clock. Age grading adds context by comparing the performance with age and gender standards for the same distance.

The result is usually shown as:

• an age-graded percentage
• an age-adjusted equivalent time

The percentage helps you understand the level of performance. The adjusted time makes the result easier to compare with another runner or with your own past results.

Why the half marathon is a good age-grading distance

The half marathon is long enough that experience matters. Pacing, fuelling, patience and not getting carried away in the first three miles all count. Age grading is useful here because older runners often bring more race judgement, even when raw speed is harder to keep.

It is also a distance where old personal bests can become emotionally noisy. A runner who once chased 1:35 may later be proud of 1:55, then wonder whether that pride is fair. Age grading gives a more structured way to answer that than simply arguing with your younger self.

Using the current TruePace Run calculator logic, a 2:00:00 half marathon at age 50 is estimated at 54.1% for a male runner and 59.8% for a female runner. The estimated age-adjusted equivalents are about 1:46:19 and 1:45:03 respectively.

Those examples are estimates from the sourced road standards, not official results. They show how the calculator turns a familiar raw time into age-group context.

By age 65, the same two-hour male half marathon estimates at 62.3%, with an age-adjusted equivalent around 1:32:19. That is why the half marathon deserves its own page rather than being treated like a longer 10K. Endurance, pacing and accumulated race judgement start to matter in different ways.

Why half marathon comparison is tricky

Half marathon results can be affected by many things:

• course profile
• weather
• pacing
• fuelling
• training consistency
• recovery
• injury history

Age grading does not know all of that. It simply gives you a fairer starting point than raw time alone.

Is a two-hour half marathon good for my age?

For many recreational runners, a two-hour half marathon is a meaningful benchmark. But the age-adjusted picture changes with age and gender.

That is why the better question is not only is two hours good, but what does two hours mean for my age group?

How to use the calculator

Use the half marathon calculator:

• Enter your finish time.
• Add your age and gender.
• Review the age-graded percentage.
• Review the age-adjusted equivalent time.
• Use the result as context, not an official ranking.

TruePace Run uses sourced 2025 road-running age standards and shows the source near the calculator result.

How to use the result

For a half marathon, the most useful reading is usually a combination of raw time, age grade and race execution. A tidy age grade from a well-paced race is often more useful than a slightly faster time rescued after a dramatic fade.

• Use raw time to set the race-day goal.
• Use age grade to compare with older PBs or runners in other age groups.
• Use the adjusted time to make the result easier to understand.
• Use your own race notes to account for weather, hills, fuelling and pacing.

The best use for older runners

For many masters runners, age grading makes the sport feel fairer. You may not be running the raw times you ran ten or twenty years ago, but your age-graded result may show that the performance is still strong.

That can be motivating. It gives you a way to keep racing seriously without pretending age has no effect. The practical next step is to calculate one recent half marathon, then compare future halves by the same age-grading method rather than by memory alone.