Horse Ratings

[twmills]

Hi Guys I really would like some help I am trying to input horse ratings using a systematic approach I am having trouble with calculations which I am copying from a book the problem I am having is the ratings are done on a calculator, using the M+, MR, and +/-. How do I do this in excel.

For example GILDERDALE got beat by 1.5 lengths * 2.74 then = key followed by M+ then MR then +/-. Next press + enter weight 126+ class 105= 207.88. Round off.

Can anyone please help. Thank You