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I want the answer with the Deviated formula
Single phase motor cannot start alone as rotating magnetic flux is not generated with single phase supply.
To make rotating magnetic field in stator single phase supply is made like double phase supply with the help of a capacitor and double phase stator winding.
For a 230V 50Hz motor 50 MF / HP is a rough and ready starting point. i.e. for a 60W motor use 60/750 X 50 = 4 MF.
One way is to measure with a Farad meter ( Capacitor should be discharged). Second way, if we know the AC Voltage across and the current flowing through it, then we can determine the Reactance Xc=1/2xpixfxC. Xc=V/I and so C can be calculated in milli Farads or Micro Farads.
I am sorry this is out of my specialist !!!
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