# PIER: Ohm's Law Calculator — Electrical Reference App

> Electrical Ohm's Law calculator with interactive learning wheel and metric prefix support. (iPhone/iPad app by Bret Hardman.)

- Source: https://appshunter.io/ios/app/pier-ohms-law-calculator/id1166009550 (this page in markdown: same URL + `.md`)
- Developer: [Bret Hardman](https://appshunter.io/developer/788803580)
- Category: Utilities, Productivity
- Price: $1.99
- Rating: 3.30/5 from 4 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 21 MB
- Languages: American English
- Released: 2016-11-14
- Data updated: 2026-08-20
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/pier-ohms-law-calculator/id1166009550/reviews.md

## What is PIER?

A beautiful, quick and accurate calculator to help find the voltage, current, resistance, and power. Quick and easy to use. Interact with the ohm's law wheel to help encourage you to learn/remember the formulas of the wheel. 

Click on a formula and enter in the two variables to find the answer. Not only will it show the answer in the bottom left, but it will also show the fourth variable in the top left. 

Answers are transposed to a (easier to read) simplified value. When in need for a precise answer, simply click on one of the answers and the precise value will display with the ability to copy that value or the simplified value. Paste that value anywhere throughout your device that allows pasting.

•

The Metric Toolbar: Quickly enter in a value and change it's metric prefix without having to add a ton of 0's.

## Key features

- Ohm's Law wheel for formula learning
- Calculate voltage, current, resistance, and power
- Simplified and precise answer display
- Copyable answer values
- Metric prefix toolbar

## Chart rankings

- #194 in Top Paid · Utilities (US App Store)

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/pier-ohms-law-calculator/id1166009550/reviews.md

### 1/5 — Needs updating

*2026-02-28*

Needs updating

### 5/5 — Simple & Intuitive

*2020-08-29*

Does exactly what it claims with no excess graphics and colours to get in the way. Very easy to read although only a small issue the results of the calculation are tucked away in the corners in a much smaller font. Other than that great simple, clean app that works.

## Frequently asked questions about PIER

### What is PIER: Ohm's Law Calculator used for?

PIER: Ohm's Law Calculator is used to quickly and accurately calculate voltage, current, resistance, and power in electrical circuits. It also features an interactive Ohm's Law wheel to help users learn and remember the formulas.

### How does the Ohm's Law wheel work in PIER?

The Ohm's Law wheel in PIER allows you to interact with the formulas. By clicking on a formula and entering two known variables, the app calculates and displays the unknown variables.

### Can I copy the calculated values from PIER?

Yes, PIER allows you to display both simplified and precise answer values. You can click on an answer to see the precise value and then copy either the simplified or precise value to paste elsewhere on your device.

### Does PIER: Ohm's Law Calculator support metric prefixes?

Yes, PIER includes a Metric Toolbar that allows you to quickly enter values and change their metric prefix without needing to manually add many zeros.

### What devices is PIER: Ohm's Law Calculator available on?

PIER: Ohm's Law Calculator is available for iPhone and iPod devices.

### How much does PIER: Ohm's Law Calculator cost?

PIER: Ohm's Law Calculator is a paid app, priced at $1.99.

### When was PIER: Ohm's Law Calculator last updated?

The latest version of PIER: Ohm's Law Calculator was released on November 13, 2017.

### What is the age rating for PIER: Ohm's Law Calculator?

PIER: Ohm's Law Calculator has an age rating of 4+.

## Version history (last 2 releases)

### 1.1 — 2017-11-13

This update from Apple will improve the functionality of this app. No new features are included.

• iPhone X compatible.
• Changed the color of the PIER Wheel.
• Fixed major bug.

### 1.0 — 2016-11-14

No release notes.

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## More apps by Bret Hardman

- [RIGID: Conduit Bending Calculator](https://appshunter.io/ios/app/rigid-conduit-bending-calculator/id788803577)
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- [mathCards ÷ x + -](https://appshunter.io/ios/app/mathcards-x-plus/id1039131735)

All apps by Bret Hardman: https://appshunter.io/developer/788803580

## Related topics

[ohms law](https://appshunter.io/ios/topics/ohms-law)

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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 2026-08-20.*