# Ohms Law Calc. — Wire Size & Voltage Drop > Electrical calculators and converters for Ohm's Law, voltage drop, wire size, and impedance. (iPhone/iPad app by V PUGAZHENTHI.) - Source: https://appshunter.io/ios/app/ohms-law-calc/id491898006 (this page in markdown: same URL + `.md`) - Developer: [V PUGAZHENTHI](https://appshunter.io/developer/491898049) - Category: Utilities, Education - Price: Free with in-app purchases - Rating: 4.70/5 from 1,323 App Store ratings · 44 written reviews indexed - Age rating: 4+ - Requires: iOS 17.6 · 65 MB - Languages: American English, Dutch, Latin American Spanish, Italian, German (Germany), Polish, European Portuguese, Chinese (Simplified, China), French (France) - Released: 2012-01-06 - Data updated: 2026-08-28 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/ohms-law-calc/id491898006/reviews.md ## What is Ohms Law Calc.? The electrician's pocket toolkit — 60 electrical calculators and 16 converters with formulas and circuit diagrams for every calculation. Size wire, check voltage drop per NEC, convert kVA to amps, and solve Ohm's Law in seconds. No subscription. One small purchase unlocks everything, forever, on iPhone, iPad and Mac. WHY ELECTRICIANS AND STUDENTS LOVE IT • Every calculator shows the formula and circuit diagram — learn while you work • Organized by category: Ohm's Law, Wiring & NEC, Power & Phase, Motors & HP, Transformers, Reactance, Components, Energy & Light • SI and US customary units side by side • Available in 12 languages WIRING & CODE • Voltage Drop Calculator (NEC/IEEE) • Wire Size Selector (AWG & metric) OHM'S LAW & POWER • Voltage, Current, Resistance & Power Calculators • Single & Three Phase Power, Current and Power Factor • kVA ⇄ Amps (Single & Three Phase) • Neutral Current (3-Phase Unbalanced Loads) MOTORS, GENERATORS & TRANSFORMERS • Horsepower Calculators (DC, Single Phase, Three Phase) • Efficiency Calculators (DC, Single & Three Phase) • DC Generator, Transformer Voltage & Current • Star ⇄ Delta Conversions IMPEDANCE & REACTANCE • Impedance for R, L, C in any series/parallel combination • Inductive & Capacitive Reactance, Resonant Frequency • Characteristic Impedance (Parallel & Coaxial lines) COMPONENTS & ENERGY • Resistor Color Code • Series/Parallel Resistance, Inductance & Capacitance • Unknown Resistance & Capacitance (Series/Parallel) • Inductor & Capacitor Sizing, Voltage Divider • Energy Cost & Energy Storage Calculators ILLUMINATION • Luminous Intensity, Luminous Flux & Solid Angle 16 ELECTRICAL CONVERTERS Field strength, potential, resistance & resistivity, conductance & conductivity, capacitance, inductance, charge & current densities (linear, surface, volume), power — with Ohms, kΩ, Farads, Henrys, kVA, Volts, Weber and more. Download free and try the core calculators today. ## Key features - 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 ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Ohms Law Calc. | $3.99 | one-time | ## What do users think of Ohms Law Calc.? Overall sentiment: positive **Pros** - 🚀 Great value - 🚀 Works perfectly - 🚀 Fantastic app - 👍 Best thing since sliced bread - 🚀 Useful for electrical work - 👍 Clean and pleasing interface - 🚀 Terrific app **Cons** - 👎 Have to pay again for an app already purchased - 👎 Not easy to use - 🐛 Paid but not unlocked, no response from developer - 👎 Annoying pop-ups - 🐛 Keeps shutting down - 👎 Worst Ohms calculator ever - 👎 Needs more work - 👎 Incorrect Ohm's law formulas **Commonly reported bugs** - Paid version not unlocking - Repeatedly prompting for payment after already paid - Keyboard overlaying results making it difficult to see **Most requested features** - Add more electrical conversions and calculations - Add ability to input voltage and resistance to get amps and watts - Add kVA, rms, and other popular needed conversions ## Recent user reviews (10 of 44) All indexed reviews: https://appshunter.io/ios/app/ohms-law-calc/id491898006/reviews.md ### 5/5 — Great *2025-11-28* 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. **Developer response:** Happy to hear 😊 ### 5/5 — Change language *2025-08-28* Gooooood **Developer response:** 👍 ### 5/5 — Ohms law call. *2025-07-24* Great value. Works perfectly **Developer response:** happy to hear 😎 ### 3/5 — I have purchased the app in the past and now I have to pay again ???? *2024-11-04* 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.!!!! **Developer response:** You can always unlock the App using the restore button on the top right corner of the List View. You need not pay again. This holds good, when you switch to a new device. The App works on iPhones and iPads with that single payment. If you have trouble in restoring , kindly contact us @ contact.pugal.apps@gmail.com ### 5/5 — Fantastic app *2024-08-30* Learnt all this 40 years ago but now I can do the calculations instantly and it shows a diagram and formula . **Developer response:** Happy to hear 😎 ### 1/5 — No easy to use *2024-08-29* 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. **Developer response:** 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 ### 5/5 — Spannungsrechner *2024-01-16* sehr gut, kann schon längst Vergessenes wieder beleben :-) ! **Developer response:** 😎 ### 5/5 — Best thing since sliced bread. *2023-08-14* Best this since sliced bread. **Developer response:** 😎 ### 1/5 — Achtung, ist der gleich Quatsch wie der andere Rechner der Entwickler *2023-04-30* Habe zweimal für den gleichen Blödsinn abkassiert, so ein Betrug 🤬 **Developer response:** Hi Bitte kontaktieren Sie den Support unter contact.pugal.apps@gmail.com. Wir werden versuchen, dieses Problem zu lösen. mit grüßen V Pugazhenthi ### 1/5 — Took my money and hasn’t unlocked!?? *2023-02-07* I paid to unlock other calculators and it hasn’t worked. I tried to „restore purchase“ within the app and I get „unknown error“. I try to email the developer within the app, and just get an error. This is ridiculous, I’ve literally paid for nothing. Please resolve this asap, I’m complaining to Apple about this **Developer response:** Hi Kindly contact us at contact.pugal.apps@gmail.com. from support page in the App we will resolve this issue. with regards V Pugazhenthi ## Frequently asked questions about Ohms Law Calc. ### 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. ## Version history (last 5 releases) ### 14 — 2026-07-10 • Find calculators faster — new category chips group all 60+ calculators by purpose • Bug fixes and improvements ### 13.8 — 2026-05-28 Minor improvements and bug fixes to keep your calculations smooth and reliable. ### 13.7 — 2026-04-29 Ohm's Law Calculator just got better — faster, smoother, and easier to solve Voltage, Current & Resistance. ### 13.6 — 2026-03-11 • Fixed an issue where wire size calculation results were not displayed properly in dark mode. ### 13.5 — 2026-03-06 • Stability and performance improvements ## Apps similar to Ohms Law Calc. | App | Rating | Price | Category | | --- | --- | --- | --- | | [Electrical Calculator lite](https://appshunter.io/ios/app/electrical-calculator-lite/id922903696) | 4.6 (574) | Free | Utilities | | [Mike Holt's Electrical Toolbox](https://appshunter.io/ios/app/mike-holts-electrical-toolbox/id1406630647) | 4.6 (197) | Free | Utilities | | [Electrical Series Calculator](https://appshunter.io/ios/app/electrical-series-calculator/id967967501) | 4.5 (13) | Free | Utilities | | [Electrical Calculator](https://appshunter.io/ios/app/electrical-calculator/id495478153) | 4.6 (462) | $3.99 | Utilities | | [小灵龙App](https://appshunter.io/ios/app/app/id1221738240) | 1.0 (12) | Free | Utilities | | [Rule of Three Calculator](https://appshunter.io/ios/app/rule-of-three-calculator/id1185318300) | 2.3 (4) | Free | Utilities | ## More apps by V PUGAZHENTHI - [Electrical Calculator](https://appshunter.io/ios/app/electrical-calculator/id495478153) - [Electrical Converter](https://appshunter.io/ios/app/electrical-converter/id497685179) - [Electrical Engineering Pack](https://appshunter.io/ios/app/electrical-engineering-pack/id505423236) - [Elec Series & Parallel Calc.](https://appshunter.io/ios/app/elec-series-and-parallel-calc/id511296315) - [Universal Converter.](https://appshunter.io/ios/app/universal-converter/id519552652) All apps by V PUGAZHENTHI: https://appshunter.io/developer/491898049 ## Related topics [electric circuit calculator](https://appshunter.io/ios/topics/electric-circuit-calculator) · [ohms law calc](https://appshunter.io/ios/topics/ohms-law-calc) · [ohms law](https://appshunter.io/ios/topics/ohms-law) · [the ohms law calc](https://appshunter.io/ios/topics/the-ohms-law-calc) · [electronics calculator](https://appshunter.io/ios/topics/electronics-calculator) · [solenoid magnetic field calc](https://appshunter.io/ios/topics/solenoid-magnetic-field-calc) · [electric calculator](https://appshunter.io/ios/topics/electric-calculator) · [electricity calculator](https://appshunter.io/ios/topics/electricity-calculator) · [electrical calculations](https://appshunter.io/ios/topics/electrical-calculations) · [ohms](https://appshunter.io/ios/topics/ohms) · [wattage calculator](https://appshunter.io/ios/topics/wattage-calculator) · [electrical power calculator](https://appshunter.io/ios/topics/electrical-power-calculator) · [v pugazhenthi](https://appshunter.io/ios/topics/v-pugazhenthi) · [transformer lineman](https://appshunter.io/ios/topics/transformer-lineman) · [electrical calculator](https://appshunter.io/ios/topics/electrical-calculator) · [circuit calculator](https://appshunter.io/ios/topics/circuit-calculator) · [available fault current calculator](https://appshunter.io/ios/topics/available-fault-current-calculator) · [resistor calculator](https://appshunter.io/ios/topics/resistor-calculator) · [electrical calculator plus](https://appshunter.io/ios/topics/electrical-calculator-plus) · [wire size calc](https://appshunter.io/ios/topics/wire-size-calc) --- *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 2026-08-28.*