This article is from the Running FAQ, by Ozzie Gontang with numerous contributions by others.
Pulled this chart out of Marathoning by Manfred Steffny. ( pub 1977).
(Robert Davidson davidson@maricopa.edu)
Max. possible Realistic
10Km marathon time marathon time
------ ------------- -------------
27:00 2:05:00 2:08:30
28:00 2:10:00 2:14:00
29:00 2:15:00 2:19:30
30:00 2:20:00 2:25:00
31:00 2:25:00 2:30:30
32:00 2:30:00 2:36:00
33:00 2:35:00 2:43:00
34:00 2:40:00 2:49:00
35:00 2:45:00 2:55:00
36:00 2:50:00 3:00:00
37:00 2:55:00 3:07:00
38:00 3:00:00 3:15:00
39:00 3:05:00 3:20:00
40:00 3:10:00 3:25:00
42:30 3:22:00 3:42:30
45:00 3:35:00 4:00:00
47:30 3:47:30 4:20:00
50:00 4:00:00 4:40:00
--
Austin "Ozzie" Gontang, Ph.D.
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