Go to the "Technical Arena" discussion forum & you will get a some good advice on trying to calculate a capacity by your self - it can be like running straight into a "buzz saw". There are only "guesstimators" out there - with qualifying statemetns liek " for actual capacity ratings contact teh manufacturer". Like we male gendered folks often hear "all you men are alike" & we know that ain't true & not all lift trucks are a like.