# Magnetic Field Calc + — Straight Wire Magnetic Field

> Offline physics tool to calculate magnetic fields from electric currents. (iPhone/iPad app by Tan Chia Ling.)

- Source: https://appshunter.io/ios/app/magnetic-field-calc-plus/id1423005752 (this page in markdown: same URL + `.md`)
- Developer: [Tan Chia Ling](https://appshunter.io/developer/321121189)
- Category: Utilities, Productivity
- Price: $2.99
- Rating: 4.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 17.6 · 1 MB
- Languages: English, French, German, Japanese, Korean, Portuguese, Chinese, Spanish, Chinese
- Released: 2018-08-17
- Data updated: 2026-07-07
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/magnetic-field-calc-plus/id1423005752/reviews.md

## What is Magnetic Field Calc +?

Calculate magnetic fields generated by electric currents with precision and ease. Magnetic Field Calculator is a fast, offline physics tool designed for students, engineers, and science enthusiasts.

FOUR CALCULATION MODES
• Straight Wire — B = (μ₀ · I) / (2π · r)
• Circular Loop — B = (μ₀ · I) / (2 · R)
• Solenoid — B = μ₀ · n · I
• Toroid — B = (μ₀ · N · I) / (2π · r)

SOLVE FOR ANY VARIABLE
Not just magnetic field strength — reverse-calculate current (I), distance (r), radius (R), turn density (n), or total turns (N). Select what you want to solve, enter the known values, and get instant results.

INTERACTIVE DIAGRAMS
Each mode displays a clear 2D diagram showing the wire geometry, field direction, and key variables. Visual learning made simple.

FLEXIBLE UNIT SUPPORT
• Current: Ampere (A), Milliampere (mA)
• Distance: Meter (m), Centimeter (cm), Millimeter (mm)
• Magnetic Field: Tesla (T), Microtesla (µT), Gauss

All conversions handled automatically with high-precision SI calculations.

BUILT-IN REFERENCE
Quick-access formula sheet with constants (μ₀), formulas, variable definitions, and unit conversion tables — everything you need in one place.

SAVE & REVIEW
Save calculations to history for quick reference. Copy results to clipboard with one tap.

WORKS OFFLINE
No internet connection required. All calculations run locally on your device — fast, private, and reliable.

Perfect for physics homework, exam preparation, lab work, electrical engineering projects, or anyone curious about electromagnetism.

The magnetic force on a current-carrying wire is perpendicular to both the wire and the magnetic field, with the direction given by the right-hand rule.

Magnetic fields arise from charges, similar to electric fields, but are different in that the charges must be moving. A long straight wire carrying a current is the simplest example of a moving charge that generates a magnetic field. The force a charge feels when moving through a magnetic field depends on the right-hand rule. The direction of the magnetic field due to moving charges also depends on the right-hand rule.

The direction of the magnetic field is perpendicular to the wire and is in the direction the fingers of the right hand would curl if wrapped around the wire with the thumb in the direction of the current.

The strength of the magnetic field depends on the current I in the wire and d, the distance from the wire.

Thank you for your support, and feel free to visit nitrio.com for more apps for your iOS devices.

## Key features

- Four calculation modes (Straight Wire, Loop, Solenoid, Toroid)
- Solve for any variable (field, current, distance, etc.)
- Interactive 2D diagrams
- Flexible unit support (A, mA, m, cm, mm, T, µT, Gauss)
- Built-in reference sheet
- Save and copy calculations
- Offline functionality


## Frequently asked questions about Magnetic Field Calc +

### What calculation modes does Magnetic Field Calc + offer?

Magnetic Field Calc + offers four calculation modes: Straight Wire, Circular Loop, Solenoid, and Toroid. Each mode allows for precise calculation of magnetic fields generated by electric currents.

### Can I solve for variables other than magnetic field strength in Magnetic Field Calc +?

Yes, you can solve for any variable. Magnetic Field Calc + allows you to reverse-calculate current (I), distance (r), radius (R), turn density (n), or total turns (N) by entering known values.

### Does Magnetic Field Calc + support different units?

Yes, it supports flexible unit support for current (Ampere, Milliampere), distance (Meter, Centimeter, Millimeter), and magnetic field (Tesla, Microtesla, Gauss). All conversions are handled automatically.

### Is Magnetic Field Calc + available offline?

Yes, Magnetic Field Calc + works offline. All calculations run locally on your device, ensuring speed, privacy, and reliability without an internet connection.

### What is the price of Magnetic Field Calc +?

Magnetic Field Calc + is a paid application priced at $2.99. This one-time purchase grants access to all its features.

### What devices is Magnetic Field Calc + compatible with?

Magnetic Field Calc + is compatible with iPhone, iPad, and iPod devices. It is designed for iOS users.

### How often is Magnetic Field Calc + updated?

The latest version of Magnetic Field Calc + is 1.5, last updated on May 8, 2026. This indicates regular updates to improve functionality and reliability.

### Does Magnetic Field Calc + have ads?

No, Magnetic Field Calc + does not contain advertisements. As a paid application with no in-app purchases, it offers an ad-free experience.

## Version history (last 5 releases)

### 1.5 — 2026-05-08

- Optimized for the latest devices.
- Fixed minor bugs.
- Improved and redesigned the UI.

### 1.3 — 2026-03-18

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

### 1.2 — 2024-04-19

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

### 1.1 — 2021-02-15

- Update for Newest Devices
- Bug Fixed

### 1.0 — 2018-08-15

No release notes.

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All apps by Tan Chia Ling: 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 2026-07-07.*