Birmingham    G3UPA    IO92dm 

Calculation of Capacitance.
The following formula is used to calculate the capacitance between rectangular parallel plates  
Enter Width in inches (smallest plate)  inches 
width in millimetres  mm 
Enter Height in inches (smallest plate)  inches 
height in millimetres  mm 
Enter dielectric constant (see dropdown list above)  k 
Enter spacing between plates in inches (1mm=.0394in)  inches 
spacing between plates in millimetres  mm 
Enter total number of plates (moving & fixed)  
Click here for default values  
Capacitance  pF 
Area of plate calculated from W & H (Imperial)  sq inch 
Area of plate calculated from W & H (Metric)  sq cm 
Select dielectric from list below and recalculate to find approximate breakdown voltage  
volts  
Plate radius = Width / 2 = inches  radius squared = 
Using semicircular rotor plates, Area = sq in = sq cm  Capacitance = pF 
Once you hit Calculate and have a result, you can change any value and Calculate again.  
Examples of Non rectangular plates  < Back to Calculations > 