Ohms Law Calc.

Ohms Law Calc.

Wire Size & Voltage Drop

1.3K ratings
29 reviews
Free
In-App PurchasesWith Ads

Details

  • Released
  • Updated
  • January 6, 2012
  • May 28, 2026

Features

Ohms Law Calc. screenshot #1 for iPhone
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Ohms Law Calc. screenshot #9 for iPhone
Ohms Law Calc. screenshot #10 for iPhone
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About

This app provides a comprehensive suite of electrical calculations, including Ohm's Law, voltage drop, wire sizing, and impedance. It also offers numerous converters for various electrical units and parameters, aiding in circuit design and analysis.

Ohm's Law calculations
Voltage drop calculator
Wire size calculator
Impedance calculations (R, L, C)
Electrical unit converters
Power and current conversions
Circuit design tools
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What users say

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What's New in Ohms Law Calc.

13.8

May 28, 2026

Minor improvements and bug fixes to keep your calculations smooth and reliable.

1

In-App Purchases

$3.99

Ohms Law Calc.

Open all Calculators in the App & remove Ads.

User reviews

Great

Ive had the app for a while now and its definitely come a long way and its looking great. I’m a journeyman electrician and the app has been very useful. The dev is also really great at responding to feedback and making improvements. Highly recommend, for less then a coffee its a great deal.

Response from developer

Happy to hear 😊

Ohms law call.

Great value. Works perfectly

I have purchased the app in the past and now I have to pay again ????

App was purchased 2 years ago. They made an update recently and now I have to buy again the app that I have already purchased. This is stealing. This is fraud! Give me acces back to the app that I have already paid for.!!!!

Fantastic app

Learnt all this 40 years ago but now I can do the calculations instantly and it shows a diagram and formula .

No easy to use

Just trying to calculator multiple resistors in parallel. Thought I used to be able to use this app. Could figure it out now. Went to web based calculator which was much easier.

Response from developer

The App has multiple resistor calculations for both parallel and series circuit.It also has a calculator for finding the unknown resistance for a parallel and series circuit for a given total resistance . It's unfortunate that you are not happy with the App. Anyway we will try to improve for better user experience

Developer apps

User experience

🐞

Reported Bugs

3 issues

Paid version not unlocking

Bug

Repeatedly prompting for payment after already paid

Bug

Keyboard overlaying results making it difficult to see

Bug

Requested Features

3 requests

Add more electrical conversions and calculations

Feature

Add ability to input voltage and resistance to get amps and watts

Feature

Add kVA, rms, and other popular needed conversions

Feature

FAQ

What does Ohm's Law Calc. do?

Ohm's Law Calc. is a utility app that offers a wide array of electrical calculations and conversions. It includes tools for Ohm's Law, voltage drop, wire sizing, impedance calculations for various component combinations, and numerous unit converters for electrical parameters.

What are the key features of this app?

Key features include calculators for voltage, current, resistance, power, voltage drop, and wire size. It also provides impedance calculations for R, L, and C in series and parallel, power and current conversions (kVA to Amps), efficiency and power factor tools, and circuit design utilities like Star-to-Delta conversions.

Is this app free to use?

The app is free to download and use, but it does contain advertisements and offers in-app purchases. This means you can access its core functionalities without payment, but may choose to purchase additional features or remove ads.

What devices is Ohm's Law Calc. compatible with?

This application is designed to work across multiple Apple devices, including iPhones, iPads, and Macs. This broad compatibility ensures users can perform their electrical calculations on their preferred Apple hardware.

Who would benefit from using this app?

This app is highly beneficial for electricians, electrical engineers, students studying electrical subjects, and DIY enthusiasts working on electrical projects. Anyone who needs to perform precise electrical calculations, understand circuit behavior, or convert between different electrical units will find this app valuable.