Capacitors in series can never be bigger than the smallest size in the series so a 5uf & 85uf will be smaller than 5uf.
Two of the same size capacitors in series equals 1/2 of the rating of one. So two 10uf caps = 5uf

Enter any two numbers to get the third number 


The formula: Multiply the max amp rating by the resitance from C to High. Take the result and divide it by the resistance measured from C to another speed. For instance you have a 3 speed motor with an amp rating of 2.9. You measure the resistance: C to High = 19 ohms C to Med = 25 ohms C to Low = 31 ohms. 19 x 2.9 = 55.1 now divide that by the different ohm readings you get from the different speeds. 55.1/25 = 2.20 amps med. 55.1/31 = 1.78 amps low 