The farad (symbol: F) is the SI derived unit of capacitance. The unit is named after the English physicist Michael Faraday.

A farad is the charge in coulombs which a capacitor will accept for the potential across it to change 1 volt. A coulomb is 1 ampere second. Example: A capacitor with capacitance of 47 nF will increase by 1 volt per second with a 47 nA input current.

1 microfarad (μF) = one millionth (10^-6) of a farad, or 1000000 pF, or 1000 nF; 1 nanofarad (nF) = one billionth (10^-9) of a farad, or 1000 pF; 1 picofarad (pF) = one trillionth (10^-12) of a farad.

A farad has the base SI representation of: s⁴ × A² × m^-2 × kg^-1

It can further be expressed as:

Failed to parse (Missing texvc executable; please see math/README to configure.): \mbox{F} = \,\mathrm \frac{A \cdot s}{V} = \dfrac{\mbox{J}}{\mbox{V}^2} = \dfrac{\mbox{W} \cdot \mbox{s}}{\mbox{V}^2} = \dfrac{\mbox{C}}{\mbox{V}} = \dfrac{\mbox{C}^2}{\mbox{J}} = \dfrac{\mbox{C}^2}{\mbox{N} \cdot \mbox{m}} = \dfrac{\mbox{s}^2 \cdot \mbox{C}^2}{\mbox{m}^{2} \cdot \mbox{kg}} = \dfrac{\mbox{s}^4 \cdot \mbox{A}^2}{\mbox{m}^{2} \cdot \mbox{kg}} = \dfrac{\mbox{s}}{\Omega}