Age Grading Tables for 5K to Marathon

The age-grading tables answer one question: what time counts as 100% for a runner of your exact age and sex? Below are the 2025 road standards for the four distances the tables are built on — 5K, 10K, half marathon and marathon — approved by the USATF Masters Long Distance Running Council on January 10, 2025.

Standard times: 5K and 10K

Age	5K men	5K women	10K men	10K women
Open (peak years)	12:49	13:54	26:24	28:46
40	13:32	14:38	27:24	29:54
50	14:36	16:11	29:43	32:36
60	15:52	18:14	32:27	36:45
70	17:26	20:54	35:45	42:06
80	20:42	24:39	41:54	50:04

Standard times: half marathon and marathon

Age	Half men	Half women	Marathon men	Marathon women
Open (peak years)	57:31	1:02:52	2:00:35	2:09:56
40	59:41	1:05:29	2:03:15	2:14:14
50	1:04:55	1:11:49	2:14:32	2:24:24
60	1:11:10	1:21:27	2:28:05	2:43:08
70	1:18:45	1:34:04	2:44:40	3:09:26
80	1:33:00	1:53:12	3:13:54	3:53:49

The full tables run every single year of age from 5 to 100, for both sexes, at every road distance out to 200 km. The rows above are a sample to show the shape of the curve; for your exact age, read the value from the source file rather than interpolating between two decades by hand.

Factor or standard: two views of the same number

Each entry exists in two forms. The age factor is the open standard divided by the age standard, so it is 1.000 through the peak years and falls from there. The standard time is what the calculator wants.

Age standard = open standard ÷ age factor

Men’s 10K, worked through: the open standard is 26:24 (1,584 seconds) and the factor at 50 is 0.8886, so the age standard is 1,584 ÷ 0.8886 = 1,783 seconds, or 29:43. The women’s factor at the same age and distance is 0.8822 against an open standard of 28:46, giving 32:36.

The women’s curve is not a copy of the men’s shifted down. At 5K the men’s factor is 0.7353 at 70 and the women’s 0.6650; by 80 the gap widens to 0.6191 against 0.5640. Whatever you score, score it against your own table.

Distances that are not one of the four

Only 5K, 10K, the half and the marathon get standards built directly from single-age bests. Everything else — 6K, 8K, 12K, 15K, 10 miles, 50K — has its age factor interpolated between the two nearest of those four, and the standard time then falls out of the factor. The 2025 edition rebuilt this step, which its authors describe as “an improved interpolation scheme for computing age factors”. Distance enters on a logarithmic scale, so for a 6K:

u = (log 6 − log 5) ÷ (log 10 − log 5) = 0.263, then F6 = F5 × (1 − u) + F10 × u

It checks out against the published men’s file. At 40 the factors are 0.9475 at 5K and 0.9636 at 10K, and the blend returns 0.95173 against the 0.9517 printed in the table; at 70 it returns 0.73617 against 0.7362. Note also that 0.263 is larger than the 0.200 a plain linear split of the distance would use, so the logarithmic scale leans toward the 10K end rather than away from it.

What the blend is applied to matters. Run it on the standard times instead of the factors and it misses by around 6% — the interpolated quantity is the factor, and the standard time for each age is the open-class standard divided by it.

Score your own time

Take the standard for your age, sex and distance from the tables above, convert both it and your race time to minutes, and read the percentage:

For what the resulting percentage means and the bands USATF publishes, see the age grading calculator; for why the same figure is also called the WMA percentage, see that page.