How to use the electric field energy density calculator
Find the energy stored per cubic metre in an electric field in a dielectric. Enter electric field, relative permittivity in the fields above; the energy density is computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “electric field energy density”, “capacitor energy per volume”, “field energy”, “calculate electric field energy density”, “find energy density”.
Formula
Variables
- Ef — Electric field (V/m)
- er — Relative permittivity
Worked example
With electric field = 1000000 V/m, relative permittivity = 1, the calculator gives energy density ≈ 4.427094 J/m³.
Frequently asked questions
What is the electric field energy density calculator used for?
Find the energy stored per cubic metre in an electric field in a dielectric. It helps with questions such as “electric field energy density”, “capacitor energy per volume”, “field energy”.
What is the formula for the electric field energy density calculation?
Energy density (J/m³) = 0.5 × er × EPS0 × Ef × Ef. Here Ef is electric field (V/m), er is relative permittivity.
What inputs do I need for the electric field energy density calculator?
You need electric field in V/m, relative permittivity. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the electric field energy density calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the electric field energy density result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.