08/01/13 Parallel Plate Capacitor Capacitance Calculator

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Plate Capacitor Capacitance Calculator

See our other Electronics Calculators.

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

Equation:

C= K*Eo*A/D, where  Eo= 8.854x10­12

where:

K is the dielectric constant of the material,A is the overlapping surface area of the plates,d is the distance between the plates, andC is capacitance

A (plate area)  (mm2)

d (distance)  (mm)

K (dielectric constant ) 1

Compute

Capacitance  (uF)

Capacitance  (pF)

C= K*0.2248*A/d

A (plate area)  (sq. in.)

d (distance)  (inches)

K (dielectric constant ) 1   

Calculate Capacitance

C (Capacitance)  (pF)

Common Dielectric Constants

Vacuum 1Air 1.00054Teflon 2.1Polyisobutylene 2.2Mineral Oil 2.23Polyethylene 2.25Polystyrene 2.4–2.7Kraft Paper 2.6Table Salt 3–15Polycarbonate 3.1Paper 3.5Silicon dioxide 3.7FR4 4.2Concrete 4.5Glass 4.7 (3.7–10)Halowax 5.2Chlorinated Diphenyl 5.3Ruby Mica 6.5­8.7

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08/01/13 Parallel Plate Capacitor Capacitance Calculator

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Ruby Mica 6.5­8.7Diamond 5.5–10Rubber 7Aluminum Oxide 8.4Glass 10Graphite 10–15Silicon 11.68Tantalum Pentoxide 28Methanol 30Niobium Oxide 40Titanium Dioxide 80

Water 88–80.1–55.3–34.5(0–20–100–200 °C)

Titanium Dioxide 86–173Strontium Titanate 310Barium Titanate (Class1) 5­450Barium Titanate (Class 2) 200­12000

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