Decathlon calculator

Every event is scored on its own with the formulas published in the World Athletics (IAAF) Scoring Tables for Combined Events, then the event scores are added. The tables printed in that book are generated from these same formulas:

Each event score is rounded down to a whole number before it is added (123.999 becomes 123). Hand-timed races up to 400m are scored as if they were 0.24 s slower (0.14 s for the 400m); there is no adjustment for the 800m, 1000m or 1500m. The calculator first records a hand time to the next tenth, as the timing rules require.

We checked this calculator against every mark covered by the book's printed tables (147,375 marks across all events, electronic and manual timing). It agrees everywhere except three marks where the printed table skips or misprints a row. There we keep the formula, which the book gives as the scoring method. It also reproduces the book's sample score sheets from the 2001 World Championships to the point.

The constants for each event as printed, plus the weakest mark worth at least 1,000 points (electronic timing for races):

Kevin Mayer, Talence 2018 (world record): 9,126 points. Each line below is the formula above with the mark plugged in, rounded down.

The tables are built so a strong mark in any event earns roughly the same reward: 1,000 points takes a 10.39 100m, a 7.76m long jump or a 2.21m high jump. Because the running formulas are curved (exponent above 1), each hundredth you take off a fast time is worth more than the same hundredth off a slow one.

The women's decathlon uses its own constants for the 100m, 400m, 1500m, pole vault and discus. Its hurdles, high jump, long jump, shot put and javelin use the same tables as the heptathlon. For the seven-event version see the heptathlon calculator, and to compare a single result with open events use the World Athletics points calculator.