# Energy Density of Fields Calc — Electric and Magnetic Fields

> Electric and Magnetic Fields (iPhone/iPad app by Nitrio.)

- Source: https://appshunter.io/ios/app/energy-density-of-fields-calc/id1430661197 (this page in markdown: same URL + `.md`)
- Developer: [Nitrio](https://appshunter.io/developer/321121189)
- Category: Utilities, Productivity
- Price: $2.99
- Age rating: 4+
- Requires: iOS 13 · 1 MB
- Languages: American English
- Released: 2018-09-02
- Data updated: 2026-05-31
- User reviews in markdown: https://appshunter.io/ios/app/energy-density-of-fields-calc/id1430661197/reviews.md

## What is Energy Density of Fields Calc?

Energy Density of Electric and Magnetic Fields Calculator is a physics/math calculator designed to find energy density quickly and easily.

Features:
- Instant calculations.
- Results can be copied to other apps.
- Formulas are included as references.
- Supports up to 16 decimal places.
- Supports various units for each input.
- Works seamlessly on both iPhone and iPad.
- Lightweight, compact app optimized for everyday use.
- Ad-free and built with privacy in mind.

Energy density is described as the amount of energy stored in a region or system per unit volume. Both electric and magnetic fields can store energy. Energy density is denoted by the letter U.

In electromagnetic waves, both the magnetic and electric fields contribute equally to energy density. Therefore, the formula for energy density is the sum of the energy densities of the electric and magnetic fields.

Formula:

U = E² * (ϵ₀ / 2) + B² / (μ₀ * 2)

Where:
U - Energy density
E - Electric field
B - Magnetic field
ϵ₀ - Vacuum permittivity, ϵ₀ ≈ 8.8541 * 10^(-12) F/m
μ₀ - Vacuum permeability, μ₀ ≈ 4π * 10^(-7) H/m

Thank you for your support. Please visit nitrio.com for more apps for your iOS devices.


## Version history (last 4 releases)

### 1.3 — 2026-03-20

- Updated for the newest devices.
- Minor bugs fixed.

### 1.2 — 2024-05-23

- Updated for the newest devices.
- Minor UI update.
- Minor bugs fixed.

### 1.1 — 2021-03-10

- Update for Newest Devices
- Bug Fixed

### 1.0 — 2018-08-31

No release notes.

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All apps by Nitrio: https://appshunter.io/developer/321121189

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-31.*