body fat percentage

Does anyone know what the best tools are to work this out I went on a web site yesterday which said I was 40% fat!!!! I quick adjusted everything I was doing but then I downloaded an app on my i phone and that worked it out at 27% I understand this is still too much but its a huge difference. I am quite muscley (I know not a word lol) but carry most weight around my middle after 2 kids which is shrinking due to diet and exercise but I am thinking of moveing to the next step now ie building muscle.

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