# Calculate the Capacitance between Parallel and Coaxial Circular Disks

The calculator will calculate the capacitance of parallel and coaxial cylinders based given values of a permittivity of free space, relative permittivity radius and distance.

**Formula:**

C ≃ (ε_{o} ε_{r}πa^{2} / d) + ε_{o} ε_{r}a * [ ln((16πa) / d)-1 ]

**Where,**

C = Capacitance of Parallel and Coaxial Cylinders,

a = Radius,

d = Distance,

ε_{o} = Permittivity of Free Space,

ε_{r} = Relative Permittivity