The total capacitance of a circular parallel plate capacitor including edge effect, can be calculated using the following formula.

Where r is the Radius in mm

ε_{r} is the Relative Dielectric Constant

d is the Dielectric thickness in mm

d << r

The calculator can be used to check results obtained with the Accurate Method for Measuring Relative Dielectric Constant of a PCB Using a Vector Network Analyser

The calculator uses the equation above, derived from Kirchhoff's formula for a circular capacitor

This calculator is provided free by Chemandy Electronics in order to promote the FLEXI-BOX

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