⚡ Energy Density of Fields Calculator

What field energy density is

Electric and magnetic fields store energy in the space they occupy. This calculator computes the energy per unit volume (energy density) for a uniform electric or magnetic field.

The formulas

For an electric field, energy density u = ½ε₀E², where ε₀ is the permittivity of free space and E is the electric field strength in volts per meter. For a magnetic field, u = B² / (2μ₀), where μ₀ is the permeability of free space and B is magnetic flux density in tesla.

These are standard formulas from classical electromagnetism, valid for fields in a vacuum or air.