Everything, from the 100m time to the height in pole vault, has to be converted into points, that make up the final score in a decathlon. To do that, there are exact formulas and scoring tables.
This handy combined events points calculator allows you to calculate both of men's and women's decathlon, heptathlon and pentathlon scores. Also adjust for junior competitions.
Decathlon 2000 has pretty much everything you could want to know about decathlon. Whenever I go to a decathlon, you can be sure that I’ve got a sheaf of Decathlon 2000 athlete profiles printed, tabbed, and highlighted in my notebook - Gabby Pieraccini