--- title: "OHMs Law Calc - Reviews, Revenue and Downloads in United States | Apple App Store" description: "A precision electrical calculator for electricians, engineers, students, and AV/lighting pros — built for iPhone, iPad, and Mac. Single-Phase Calculator Enter any two of Volts, Amps, Watts, or Ohms a" --- # OHMs Law Calc — United States ![OHMs Law Calc App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/aa/70/d1/aa70d140-c268-49fd-87e8-ef33422c9aac/AppIcon-0-0-1x_U007epad-0-1-85-220.png/434x0w.png) **Developer:** [Jonathan Mellen](https://apptail.io/developer/jonathan-mellen-VuM) **Category:** Reference **Rating:** 4.0/5 (3 ratings) **Price:** $1.99 **Bundle ID:** com.CaladanSoftware.OHMCalc **Store:** Apple App Store **Country:** United States **Version:** 3.3.3 (released 2026-06-07) **Original Release:** 2012-01-31 **Languages:** English **App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id497274523) **AppTail Page:** [https://apptail.io/app/ohms-law-calc-vZOf/united-states](https://apptail.io/app/ohms-law-calc-vZOf/united-states) ## OHMs Law Calc Description A precision electrical calculator for electricians, engineers, students, and AV/lighting pros — built for iPhone, iPad, and Mac. Single-Phase Calculator Enter any two of Volts, Amps, Watts, or Ohms and the app solves the other two instantly. Results are displayed on a classic Ohm's Law pie chart with a live readout hub, so you can see the relationship between values at a glance. Three-Phase Calculator A spreadsheet-style grid for balanced or unbalanced three-phase loads. Enter per-leg voltage, current, or power and the app fills in the rest, including line and phase totals. Toggle between Delta and Wye/Star configurations — the math adjusts automatically. Power Factor A collapsible PF panel on both screens lets you apply any power factor from 0 to 1. Real Power, Apparent Power (VA), and Reactive Power (VAR) are calculated and clearly labeled. Your PF setting is remembered between sessions. NEC-Compliant Breaker Sizing Full Load Amps (FLA) and recommended breaker sizes are calculated automatically using NEC sizing rules, so you can spec circuits with confidence. Visualization Mode Tap Visualize from any calculation to see five live, interactive diagrams powered by your current values: Delta wiring topology Wye / Star wiring topology Bus-bar distribution view Phasor diagram with power triangle (P, Q, S, and PF angle) Dashboard — an all-in-one overview combining schematic, per-leg cards, and KPI readouts Print & Share Send any visualization straight to AirPrint as a clean, light-mode page — handy for job folders, submittals, or classroom handouts. Universal & Responsive One app, every Apple device. Optimized layouts for iPhone portrait, iPhone landscape, iPad split-view, and Mac Catalyst, with full dark-mode support and high-contrast yellow input cells for readability on the job site. Keyboard & Input Polish Tap-to-select-all on any field, a Done bar above the keyboard, and auto-scroll that keeps the focused field visible while you type. ## OHMs Law Calc Screenshots - [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/a0/ab/1e/a0ab1eba-b344-ad18-7d53-1aef35df9245/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-05-11_at_12.01.12.png/1320x2868.png) - [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/2f/cd/43/2fcd438e-b293-3b02-b582-cc0d0eeb7ea6/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-05-11_at_12.01.35.png/1320x2868.png) - [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/3e/2e/08/3e2e08bb-1331-d858-8dff-0f1704ab94cd/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-05-11_at_12.02.09.png/1320x2868.png) - [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/10/c4/86/10c486f8-952e-9214-3fc8-809fe1ba4106/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-05-11_at_12.02.35.png/1320x2868.png) - [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/71/ae/e7/71aee76f-1b81-bbf5-a41b-a9bfc9940e8f/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-05-11_at_12.01.52.png/1320x2868.png) - [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/09/24/6d/09246d32-58fb-3f6f-3190-44b3bf5576e9/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-05-11_at_12.01.59.png/1320x2868.png) - [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/60/c7/e3/60c7e38b-78e3-028c-fc75-b0a883aa63c1/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-05-11_at_12.02.19.png/1320x2868.png) - [Screenshot 8](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/e6/6e/09/e66e09e7-45dc-3fd1-c90c-acaeda7b2bb0/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-05-11_at_12.03.02.png/2868x1320.png) ## OHMs Law Calc Rating Breakdown in United States - 5 stars: 2 (67%) - 4 stars: 0 (0%) - 3 stars: 0 (0%) - 2 stars: 1 (33%) - 1 stars: 0 (0%) ## OHMs Law Calc Reviews in United States ### ***** "Quick and Easy!" This app really does calculate Three Phase correctly... Not just using the old "lazy engineers" trick of multiplying by 1.732... But rather doing the actual VECTOR MATH to properly calculate BOTH balanced and unbalanced loads. Works great for resistive AC circuits too! The app does exactly what it says, makes single and three phase calculations a breeze. I'll never get the wrong Three Phase Breaker again! -- Talobab, 2015-03-28 ### **--- "Incorrectly calculates for AC" Good attempt, but this calculator works 100% correctly ONLY for DC. For AC, it ignores Power Factor (PF), caused by ever present out-of-phase Reactive currents. All AC "Power" results are really in "Volt-Amps" (VA) not Watts. For 3-Ph AC it incorrectly calculates VA, when given Voltage & Current. The correct method is: V x A x 1.73 (Sq Root of 3) = VA Power in Watts is then: VA x PF = Watts PF is always a number between 0 & 1, with 1 being in-phase (purely resistive) current, and 0 being 90 deg out-of-phase (purely reactive) current. For calculations (where actual PF is unknown) a PF of 0.8 is typically used. Resistance alone in never the only factor in AC Circuits. -- DAVEOFFUTT, 2015-03-22 ### *---- "Sparky" A lot of better free apps out there! Waste of money! Wish I can take my Money back. -- Nickname taken(v1.1), 2012-09-01 ### ***** "Best ohms law app I have ever used!" This is the best ohms law app I have in my electronics folder! I really like this app! Good job!A+ -- Msweany, 2012-04-24 ### ***** "awesome" works just like described, it does 3phase and single phase. It's also iphone and ipad compatible. 5 start app all the way -- Hosboss2002, 2012-03-03 ### ***** "Draftmen" This is a very good calculator one of the best I have ever used . Very well done. -- JPerley, 2012-02-28 ### ***** "Wow." 3 Phase works!!! Finally an app with 3 phase that works. Great app, highly recommended. Very easy to use UI, saves a lot of time and mistakes. Helpful guide provided on website as well. A must have. -- hackerxbella, 2012-02-09 ### ***** "3 Phase Values At Last!" Great app. The only app that I've found that properly calculates 3 phase values. -- Bethhawking2012, 2012-01-31 [View all OHMs Law Calc reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews) ## OHMs Law Calc Store Rankings | Chart | Country | Category | Rank | |-------|---------|----------|------| | Top Paid | Norway | Reference | #109 | | Top Paid | Denmark | Reference | #113 | | Top Paid | Pakistan | Reference | #145 | | Top Paid | Sweden | Reference | #148 | | Top Paid | Belarus | Reference | #216 | | Top Paid | Finland | Reference | #220 | | Top Paid | New Zealand | Reference | #225 | ## OHMs Law Calc Discovered Keywords - ohms law calc ## Apps Similar to OHMs Law Calc - [Electrical Engineering Pack](https://apptail.io/app/electrical-engineering-pack-csOd/united-states) - [Formula MAX](https://apptail.io/app/formula-max-eWUd/united-states) - [How the House Works](https://apptail.io/app/how-the-house-works-yMde/united-states) - [iAttenuation](https://apptail.io/app/iattenuation-lVaf/united-states) - [SCIPIA ROBOCON](https://apptail.io/app/scipia-robocon-vQKm/united-states) - [Comic Art Mastery](https://apptail.io/app/comic-art-mastery-VuQp/united-states) - [iDroidSim](https://apptail.io/app/idroidsim-JLjq/united-states) - [TAPS CS](https://apptail.io/app/taps-cs-DfWx/united-states) - [Morse Trainer Pro](https://apptail.io/app/morse-trainer-pro-fEXx/united-states) - [My Laurus](https://apptail.io/app/my-laurus-hHXz/united-states) ## OHMs Law Calc Available In - [United States](https://apptail.io/app/ohms-law-calc-vZOf/united-states) - [Mexico](https://apptail.io/app/ohms-law-calc-vZOf/mexico) - [Austria](https://apptail.io/app/ohms-law-calc-vZOf/austria) - [Australia](https://apptail.io/app/ohms-law-calc-vZOf/australia) - [Azerbaijan](https://apptail.io/app/ohms-law-calc-vZOf/azerbaijan) - [Belgium](https://apptail.io/app/ohms-law-calc-vZOf/belgium) - [Brunei](https://apptail.io/app/ohms-law-calc-vZOf/brunei) - [Brazil](https://apptail.io/app/ohms-law-calc-vZOf/brazil) - [Belarus](https://apptail.io/app/ohms-law-calc-vZOf/belarus) - [Canada](https://apptail.io/app/ohms-law-calc-vZOf/canada) - [China](https://apptail.io/app/ohms-law-calc-vZOf/china) - [Colombia](https://apptail.io/app/ohms-law-calc-vZOf/colombia) - [Cyprus](https://apptail.io/app/ohms-law-calc-vZOf/cyprus) - [Czechia](https://apptail.io/app/ohms-law-calc-vZOf/czechia) - [Denmark](https://apptail.io/app/ohms-law-calc-vZOf/denmark) - [Dominican Republic](https://apptail.io/app/ohms-law-calc-vZOf/dominican-republic) - [Ecuador](https://apptail.io/app/ohms-law-calc-vZOf/ecuador) - [Estonia](https://apptail.io/app/ohms-law-calc-vZOf/estonia) - [Finland](https://apptail.io/app/ohms-law-calc-vZOf/finland) - [France](https://apptail.io/app/ohms-law-calc-vZOf/france) - [United Kingdom](https://apptail.io/app/ohms-law-calc-vZOf/united-kingdom) - [Hong Kong SAR China](https://apptail.io/app/ohms-law-calc-vZOf/hong-kong) - [Hungary](https://apptail.io/app/ohms-law-calc-vZOf/hungary) - [Ireland](https://apptail.io/app/ohms-law-calc-vZOf/ireland) - [Israel](https://apptail.io/app/ohms-law-calc-vZOf/israel) - [South Korea](https://apptail.io/app/ohms-law-calc-vZOf/south-korea) - [Kuwait](https://apptail.io/app/ohms-law-calc-vZOf/kuwait) - [Kazakhstan](https://apptail.io/app/ohms-law-calc-vZOf/kazakhstan) - [Madagascar](https://apptail.io/app/ohms-law-calc-vZOf/madagascar) - [Malaysia](https://apptail.io/app/ohms-law-calc-vZOf/malaysia) - [Netherlands](https://apptail.io/app/ohms-law-calc-vZOf/netherlands) - [Norway](https://apptail.io/app/ohms-law-calc-vZOf/norway) - [Philippines](https://apptail.io/app/ohms-law-calc-vZOf/philippines) - [Russia](https://apptail.io/app/ohms-law-calc-vZOf/russia) - [Saudi Arabia](https://apptail.io/app/ohms-law-calc-vZOf/saudi-arabia) - [Singapore](https://apptail.io/app/ohms-law-calc-vZOf/singapore) - [Taiwan](https://apptail.io/app/ohms-law-calc-vZOf/taiwan) - [Vietnam](https://apptail.io/app/ohms-law-calc-vZOf/vietnam) - [United Arab Emirates](https://apptail.io/app/ohms-law-calc-vZOf/united-arab-emirates) - [South Africa](https://apptail.io/app/ohms-law-calc-vZOf/south-africa) - [Argentina](https://apptail.io/app/ohms-law-calc-vZOf/argentina) --- ## About AppTail [AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. 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