Easily calculate electrical values like voltage, current, resistance, and power. Input any two known values, and the app will automatically compute the rest. Supports various units for precise calculations.


187+ iOS apps curated and reviewed
Out of 187+ the ohms law calc apps on iOS, 13 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.







Easily calculate electrical values like voltage, current, resistance, and power. Input any two known values, and the app will automatically compute the rest. Supports various units for precise calculations.


Calculate electrical values like current, voltage, resistance, and power using Ohm's Law. Input any two known values to automatically determine the missing one. Ideal for electrical enthusiasts and professionals.


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.


Instantly calculate resistor resistance values from color codes (3-6 bands). Includes Ohm's Law and Watt's Law calculators for voltage, current, and power. Ideal for electronics enthusiasts and professionals.


This app provides electricians and electrical professionals with up-to-date digital information based on the National Electrical Code. It includes formulas, wiring diagrams, conduit bending guides, and calculators for various electrical calculations. The app is designed for on-the-job reference and works offline.


This electric circuit calculator simplifies Ohm's Law calculations. It allows users to input two known variables (current, resistance, voltage, or power) and automatically computes the unknown values. The app also supports on-the-fly unit adjustments, eliminating the need for manual conversions.


This app simplifies electrical calculations by accurately computing voltage, current, resistance, and power. It offers a user-friendly interface and step-by-step explanations, making it ideal for students, engineers, and electricians to solve circuit problems efficiently.


This app provides electricians and electrical professionals with a powerful tool for performing complex calculations based on the latest National Electrical Code (NEC). It offers solutions for wire sizing, voltage drop, conduit sizing, and motor calculations, saving time and ensuring code compliance.


This app serves as a pocket-sized electronics lab, offering a comprehensive reference for components and circuits. It simplifies complex calculations for filters, inductors, and various circuit configurations, aiding both engineers and hobbyists in their design processes.


This utility app quickly calculates voltage, current, resistance, and power using Ohm's and Watt's laws. It's designed for electricians, engineers, and students, offering instant, accurate results with a simple interface. Works offline and is ideal for field calculations or exam preparation.


This app simplifies electrical calculations for voltage, current, resistance, and power. It features an interactive Ohm's Law wheel to aid learning and provides both simplified and precise answer values with copy functionality. A metric toolbar helps manage prefixes efficiently.


Test your electrical knowledge daily with a new question based on the US electrical code. Perfect for apprentices, journeymen, and masters seeking to learn or refresh their understanding of electrical concepts and regulations.


This tool calculates Ohm's Law for single and three-phase applications using vector calculations for balanced and unbalanced loads. It quickly determines Watts, Volts, Amps, or Ohms, and can back-calculate load resistance. Widget support is included.


This app provides a comprehensive suite of audio engineering calculators for musicians and producers. It offers free tools for length, pitch, timecode, electric, acoustics, and file size calculations, with an optional Pro tier for advanced features like LUFS targeting and batch conversion.




This virtual lab offers a hands-on experience for learning about resistors and circuit resistance. Easily build and test series and parallel circuits, measure voltage and current, and understand the impact of component changes in real-time.


This app simplifies electrical work by providing quick access to electrical codes and performing complex calculations for installations. It helps electricians find conductor ampacity, calculate voltage drop, determine box fill, and size raceways, among many other essential functions.


This tool helps contractors, engineers, and electricians quickly calculate available fault current on single and three-phase electrical systems. It also assists in sizing fuses and conductors for various circuits and can generate labels for service equipment.