I use this simple formula:1*=.01745 per inch. Thus,a one inch wide aileron will move .01745.Likewise, an aileron measuring one and one quarter"is simply found by :1.25 times .01745. A close enough method is to multiply width of aileron by 1/64".
I use the latter. Btw-.01745 is the sine of one degree. Or one degree of movement on a one inch wide aileron will be 1/64 inch.
Hope I exlained this clearly.