Charge Density Calculator

Charge density is a charge divided by the space it occupies, and this tool gives all three forms of it. Enter a charge with its unit and either a volume, an area or a length, and it returns rho, sigma or lambda in SI units together with two practical ones and the number of elementary charges behind the figure. Every input is converted to SI before the division, so the unit menus cannot disagree with the answer. It assumes the charge is spread evenly, which is the average that a real, uneven distribution is measured against.

Calculator Type
Charge Unit
Volume Unit

Charge spread through a solid body. Pick any unit on each side; both are converted to SI before the division.

Negative for an excess of electrons. The sign carries through to the density.
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Charge Unit
Area Unit

Charge spread over an area, which is where the charge on a conductor actually sits.

Negative for an excess of electrons. The sign carries through to the density.
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Charge Unit
Length Unit

Charge along a wire, a rod or a line of charge.

Negative for an excess of electrons. The sign carries through to the density.
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