# 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

### Equations

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

where:

K is the dielectric constant of the material,

A is the overlapping surface area of the plates in m^{2},

d is the distance between the plates in m, and

C is capacitance

## Imperial Units

### Equations

C= K*0.2248*A/d

### 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 |