This page is used to calculate different types of capacitors.

The basic formula to calculate capacitance is: Capacitance=dielectricConstant*area/distance, this formula has good accurancy, as long as the area is large compared to distance*distance.
Most calculations in this program is based on that formula.

Geometries supported

Capacity, used to calculate "charge" and "energy" for known capacitors.
Area, your must calculate area, can be used for unsupported geometries.
Square, two stacked square plates.
Rectangle, two stacked rectangular plates.
Circle, two stacked circular plates.
Stack, a number of stacked rectangular plates.
Roll, a roll with two conductive foils and two isolating foils.
Tube/coax, two cylinders inside each other
Sphere an sphere, two spheres inside each other
Wire, a wire above a groundplane
Wires, two wires close to each other, i.e. a cable

Input values

Diameter of the core in the roll

Capacity	Capacitance of the capacitor to analyze
Area	Area between plates of a capacitor
Side	One of the sides in a square
Width	One of the sides of a rectangle
Height	The other side of a rectangle of high above a groundplane
Diameter	Diameter of a circular plate
Plates	Number of plates stacked
Length	Length of the foil used for a roll, a coax/tube or a wire
Conductor thickess	Thickness of the conductor in a roll
Inner diameter
Tube inner diameter	Inner diameter of the large tube in a tube/coax
Center diameter	Outer diameter of the smaller tube/wire in a tube/coax
Radius inner sphere	Outer diameter of the smalle sphere
Radius outher sphere	Inner diameter of the large sphere
Distance	Distance center of between two wires
Dielectric	Select the dielectric used or select"User absolute" or "User relative"
Permittivity	Used when dielectric is "user ...", must be filled with relative or absolute permittivity
Thickness	Thickess of dielectric
Applied voltage	Voltage applied to capacitor, used to calculate some electric values for capacitor

Note: All measurement inputs, are in meters.

Output values

Total area	The total area between the plates
Capacity	The actual capacitance
Permittivity (abs)/(rel)	The permittivity of the selected dielectric shown as both absolute and relative value
Dielectric volume	The volume of the dielectric
Turns	Number of turns on a roll
Outer diameter	Outer diameter of a roll
Field	The electric field in the dielectric
Charge	The charge on the capacitor
Energy	The energy in the capacitor
Energy density	Density of energi en dielectric
Force	The force the electric field applies to the plates

Hints

To enter a value in inch, use the calculating ability of the input field. i.e. 3 inch is entered as "3*inch". This constant comes from the Calculator const page (This does NOT work for the wire diameter field, it expects input in mm, not meter)
Dielectric constant for glass is not included because it can vary between 4 and 15 (relative) depending on glass type

Other pages

For calculating serial/parallel connections use Series/Parallel page.
For calculation charge/discharge curves use Charge curve or Charge time page.
For calculation impedance of a capacitor use Ohms law page.
For designing filters with capacitors use 1. order Filters page.

MiscEl: Capacitor calculations

Geometries supported

Input values

Output values

Hints

Other pages