The best ohms law calc apps on iPhone average 4.5★ across 241+ titles — we've ranked them by what real users actually keep on their phones. Updated October 2026.
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 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.
What We Love
🚀 Great value
🚀 Works perfectly
🚀 Fantastic app
👍 Best thing since sliced bread
🚀 Useful for electrical work
👍 Clean and pleasing interface
🚀 Terrific app
Room to Improve
👎 Have to pay again for an app already purchased
👎 Not easy to use
🐛 Paid but not unlocked, no response from developer