Compute how much overlap is needed

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Given an arrays of length 40 i want to extract 37 equal sized subarrays. Since 40 is not dividable by 37, are the subarrays allowed to be overlapping.. but how do i compute the overlap?

I thought that i could compute the overlap using the modulus operator - such that 40%37 = 3.

Problem is that when i extract sub arrays of length 3, I get in total 38 subarrays and not 37... what is wrong here?

Am i computing the overlap incorrectly?.. seems so

If so? how else can I compute the nessesary stride and the window size of a window moving along the length of the array?