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Energy Density of Electric and Magnetic Fields Calculator
Energy stored per cubic metre in an electric field and a magnetic field.
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Electric energy density
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Energy stored per cubic metre in an electric field and a magnetic field.
Energy Density of Electric and Magnetic Fields Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: u = 1/2 e0 E^2 + B^2 / (2 mu0).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Energy Quick Guide
Typical values for reference.
| E V/m | B T | Electric | |
|---|---|---|---|
| 100000 | 0.5 | 4.427e-2 J/m3 | |
| 1000000 | 0.001 | 4.427e+0 J/m3 | |
| 3000000 | 0 | 3.984e+1 J/m3 | |
| 0 | 5 | 0.000e+0 J/m3 | |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Energy Density of Calculator FAQ
Answers to common questions about this calculator.
Energy stored per unit volume in a field.
Half epsilon0 times E squared.
B squared over 2 mu0.
Magnetic often dominates at everyday field strengths.