Parallel Plate Capacitor Capacitance Calculator

This calculator computes the capacitance between two parallel plates. The first calculator is metric, whereas the second is inches. Small valued capacitors can be etched into a PCB for RF applications, but under most circumstances it is more cost effective to use discrete capacitors. Various dielectric constants are listed below.

Metric Units


C= K*Eo*A/D, where Eo= 8.854x10-12


K is the dielectric constant of the material,
A is the overlapping surface area of the plates in m2,
d is the distance between the plates in m, and
C is capacitance

A (plate area) (mm2)
d (distance) (mm)
K (dielectric constant )
Capacitance (uF)
Capacitance (pF)

Imperial Units


C= K*0.2248*A/d

A (plate area) (sq. in.)
d (distance) (inches)
K (dielectric constant )
C (Capacitance) (pF)

Common Dielectric Constants

Vacuum 1
Air 1.00054
Teflon 2.1
Polyisobutylene 2.2
Mineral Oil 2.23
Polyethylene 2.25
Polystyrene 2.4 2.7
Kraft Paper 2.6
Table Salt 3 15
Polycarbonate 3.1
Paper 3.5
Silicon dioxide 3.7
FR4 4.2
Concrete 4.5
Glass 4.7 (3.7 10)
Halowax 5.2
Chlorinated Diphenyl 5.3
Ruby Mica 6.5-8.7
Diamond 5.5 10
Rubber 7
Aluminum Oxide 8.4
Glass 10
Graphite 10 15
Silicon 11.68
Tantalum Pentoxide 28
Methanol 30
Niobium Oxide 40
Titanium Dioxide 80
Water 88,80.1,55.3,34.5
(0,20,100,200 °C)
Titanium Dioxide 86-173
Strontium Titanate 310
Barium Titanate (Class1) 5-450
Barium Titanate (Class 2) 200-12000
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