Current Density Calculator

If you determine the electrical current's density, then you can use our current density calculator.

In Physics, the quantity of current that is able to move in per unit area of the conductor is called current density. The symbol "J" is used to denote the current density. In other words, Current density is described as the movement of electrons in a conductor's per unit area. It is a vector quantity, and the SI unit to represent current density is Ampere/meter2.


Formula of Current Density Calculator

To calculate current density instantly, you can use our calculator, or to find it manually, you can use the formula listed below:

J = I / A


J = Current Density

I = Current (measured in Ampere)

A = Area (measured in meters)


To calculate density, you can use our Density Calculator.


For a more transparent and precise understanding of a concept and to know how to find current density, let us have an example below:

Suppose a copper wire has an area of 20mm2, whereas the flow of electrons is 10mA, then find the current density of a wire.

Given data

I = Current = 20mm2 = 20×10-3m2
A = Area = 10mA = 10×10-3A

To Find

The current density of a wire = ?


To find out the current density of a wire, we will use the formula listed below:

J = I / A

Putting values in the formula:

J = (20×10-3m2) / (10×10-3A) = 0.5 A/m2

How to use the Current Density Calculator?

The steps to use the current density calculator are as follows:

Step 1: Enter the value of a current in the first required input.

Step 2: Enter the value of the area in the second required input.

Step 3: The calculator will automatically display an answer on the screen.

Calculator use

You can use our current density calculator in various science principles, such as; measuring the total circulation of current, and gas discharge lamps (where the output spectrum is created).