CALCULATOR · HEALTH · RUNNING
A 45-year-old man running 10K in 50:00 scores 56.9% age-graded — recreational-strong. Age grading answers the masters runner’s question: what would this performance be worth in my prime? Enter your age, sex, distance, and race time for your percentage, your age-graded equivalent open-division time, and your WMA class.
The calculator takes the WMA-style age factor for your age and sex, derives your age standard from the open-class standard, and scores your time as a percentage — then translates your effort into the equivalent open-division time. Ages between the 5-year bands are linearly interpolated.
Age-graded time = your time × age factor; % = open-class standard ÷ age-graded time × 100. At the defaults: the men’s 10K open standard is 1571.00 s (26:11); the factor at age 45 is 0.9200; age-graded time = 3000 × 0.9200 = 2760 s (46:00); % = 1571.00 ÷ 2760 × 100 = 56.92% → recreational-strong.
Setup: a 45-year-old man, 10K, finishing in 50:00 (3000 seconds).
Step 1 — the open-class standard. The men’s 10K open standard is 26:11 (1571.00 s), tracking the current world record — the theoretical best at peak age.
Step 2 — the age factor. At age 45 the men’s factor is 0.9200 (linearly interpolated if you’re between bands — e.g. age 47.5 sits halfway between the 45 and 50 factors).
Step 3 — the age-graded time. 3000 × 0.9200 = 2760 s = 46:00 — his 50:00 at 45 is the effort of a 46:00 at peak age.
Step 4 — the percentage. 1571.00 ÷ 2760 × 100 = 56.92% → recreational-strong (50–59%). To reach local class (60%) he’d need 47:26; regional class (70%) needs about 40:40. (His age standard — open standard ÷ factor — is 1707.61 s = 28:27.6, the reference time for a 45-year-old world-class man.)
Factors are rounded summaries of the published WMA 2025 factor curves (Alan Jones / Howard Grubb), approved January 2025. The age standard for any band = open-class standard ÷ factor. Ages between bands are linearly interpolated.
| Age | Men | Women |
|---|---|---|
| 20 | 0.9300 | 0.9300 |
| 25 | 1.0000 | 1.0000 |
| 30 | 1.0000 | 1.0000 |
| 35 | 0.9800 | 0.9850 |
| 40 | 0.9600 | 0.9680 |
| 45 | 0.9200 | 0.9330 |
| 50 | 0.8800 | 0.8950 |
| 55 | 0.8400 | 0.8520 |
| 60 | 0.7900 | 0.8030 |
| 65 | 0.7400 | 0.7490 |
| 70 | 0.6900 | 0.6880 |
| 75 | 0.6300 | 0.6200 |
| 80 | 0.5700 | 0.5450 |
| 85 | 0.5000 | 0.4650 |
| 90 | 0.4200 | 0.3850 |
| Distance | Men | Women |
|---|---|---|
| Mile | 3:43.13 | 4:07.64 |
| 5K | 12:35.36 | 13:58.06 |
| 10K | 26:11.00 | 28:54.14 |
| Half marathon | 56:42 | 1:02:52 |
| Marathon | 2:00:35 | 2:09:56 |
| Output | Formula | What it means |
|---|---|---|
| Age factor | band lookup, linearly interpolated | 0.9200 at the defaults — your age’s share of peak-age performance. |
| Age-graded time | your time × age factor | 46:00 at the defaults — what your effort equals at peak age. |
| Age-graded % | open-class standard ÷ age-graded time × 100 | 56.92% at the defaults → recreational-strong — your score. |
| Age standard | open-class standard ÷ age factor | 28:27.6 at the defaults — the reference time for your age, sex, and distance. |
| WMA class | 90+ world class · 80–89 national · 70–79 regional · 60–69 local class · 50–59 recreational-strong · <50 beginner | Recreational-strong at the defaults — the standard reading of the percentage. |
The standards are empirical tables, not physiology — they summarize how the best masters athletes have actually performed, which reflects who shows up and trains as much as how bodies age. The factors embedded here are rounded 5-year summaries of the published WMA 2025 curves (Alan Jones / Howard Grubb, approved January 2025), not the official per-age tables — results can differ a few points from the official WMA calculator, so use official tables for records and prize money. One factor curve per sex is used across all five distances; the official tables vary slightly by distance, especially past 70. Courses matter: standards assume flat, fast, certified courses — hills, heat, wind, and trail surfaces age differently than flat roads, and a hilly 10K grades lower than the same effort on the track. The tables also can’t see your training history, injuries, or the fact that you started running at 50 — two identical ages can hold very different potential.
Bright Side Kit. "Age Graded Running Calculator: Your Time vs WMA Standards." https://brightoolbox.com/age-graded-running/ Accessed October 23, 2026.Data sources60% is solid club-level running — the first meaningful benchmark, and the level parkrun regulars recognize (parkrun prints an age grade on every 5K result, the easiest free way to track yours). 70%+ is regional class (you’re placing in local races), 80%+ is national class, and 90%+ is world class (masters world-record neighborhood). Below that, 50–59% is recreational-strong and under 50% is beginner — our default 56.92% is a perfectly normal recreational-strong score with clear room to grow.
Because aging hits speed and endurance differently. Pure speed (the mile) declines faster with age than aerobic endurance — a 70-year-old keeps more of their marathon ability than their mile speed, relatively speaking. The factor curves flatten for longer distances at older ages, which is also why many runners discover they’re “better” at the half marathon than the 5K as they age.
They answer different questions. A Boston qualifier is a fixed cutoff (e.g. 3:00 for young men) — pass/fail, and it gets easier in older age groups by design. Age grading is a continuous score that works for any distance and any age, including 25-year-olds. BQ tells you if you’re in; age grading tells you how good you are.
In theory, almost never. The open-class standards sit at or near world-record level, so 100% means a world-record-equivalent performance for your age. The tables are deliberately built so the very best age-group performances land in the mid-90s — a 100%+ score usually means a data error, a short course, or a genuinely historic run.
Roughly every 5–10 years. The WMA tables were revised in 1994, 2006, 2010, 2015, and 2023, with the current tables approved in January 2025 (Alan Jones / Howard Grubb). Each revision tightens the factors where new masters records have landed — which means a 75% from 2010 isn’t exactly the same ruler as a 75% today.
Different tables, different answers. Calculators disagree because they use different revisions (2015 vs 2020 vs 2023), per-age vs 5-year-band factors, or approximate curves like this page’s. A few percentage points of difference is normal. Compare scores only within the same calculator — and use the official WMA tables for anything that matters.