There are formulas out there, but each different depending on the application, surrounding components, etc. It could be used in a timing circuit. Then you would need to know which IC is being used or what are the resistors being used with it. It could be used as a filter in a power supply. Then you would need to know current rating, frequency, ripple. It could be used for decoupling. It could be used in a filter (RC/LC high/low pass). It could be used as a snubber. There are hundreds of applications out there and the required value depends on the combination of components used in each circuit depending on what function the capacitor carries out.
Hope this helps.
Tahmid.