Please select your instrument class, and enter the scale length. Please not that the type of instrument has no baring on the fret spacing. However, certain instrument have quite idiosyncratic designs; for example the banjo's short 5th string, or the dulcimer's full length neck and diatonic fretting. Guitar should cover anything you're not sure about (including, confusingly enough, the 4-string banjo family.)
The drawing to the left is by no means intended to resemble the instrument, but it should be correct with regards to important features, like where the bridge is!