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What formula is used to calculate one rep max?

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asked Jan 4 in Windows Phone by Ronik Khachatoorian (240 points)

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The 1RM calculations is:

weight * (1 + repetitions / 30)
answered Jan 5 by Ryan Winter (1,500 points)
Thanks very much! Any chance a feature can be added in the settings to let the users select a particular formula? Either selecting form a list of different formulas or manually entering a formula?
Hi Ronik, it would be generally easy to add additional preset formulas, if you point me towards the definition you are looking at I can see if it fits into the existing arch.
Hi Ryan, thank you! I noticed that some of my muscles underperform, so I was thinking about the O'Conner formula which has a "40" instead" of the "30" in the Epley formula. (Or perhaps make that denominator user-editable?)

If it is not too much of a programming work, it would be great if you can add this feature in a per exercise manner (rather than general) because most muscles respond well to the Epley formula. But if it's a lot of work, then you can just keep it as is.

Thanks for developing the best workout app!

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