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Version
3.3.3
Size
8.79 Mb
Updated
6 days ago
Released
31 Jan 2012
Screenshots
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.
Estimates
Search Keywords 1
| # | Term | Country | Place | Priority |
|---|---|---|---|---|
| 1 | circuit calc pro | #3 |
Competitors
Availability
Devices
iPhone3GS
iPhone4
iPodTouchFourthGen
iPad2Wifi
iPad23G
iPhone4S
iPadThirdGen
iPadThirdGen4G
iPhone5
iPodTouchFifthGen
iPadFourthGen
iPadFourthGen4G
iPadMini
iPadMini4G
iPhone5c
iPhone5s
iPadAir
iPadAirCellular
iPadMiniRetina
iPadMiniRetinaCellular
iPhone6
iPhone6Plus
iPadAir2
iPadAir2Cellular
iPadMini3
iPadMini3Cellular
iPodTouchSixthGen
iPhone6s
iPhone6sPlus
iPadMini4
iPadMini4Cellular
iPadPro
iPadProCellular
iPadPro97
iPadPro97Cellular
iPhoneSE
iPhone7
iPhone7Plus
iPad611
iPad612
iPad71
iPad72
iPad73
iPad74
iPhone8
iPhone8Plus
iPhoneX
iPad75
iPad76
iPhoneXS
iPhoneXSMax
iPhoneXR
iPad812
iPad834
iPad856
iPad878
Watch4
iPadMini5
iPadMini5Cellular
iPadAir3
iPadAir3Cellular
iPodTouchSeventhGen
iPhone11
iPhone11Pro
Watch5
iPadSeventhGen
iPadSeventhGenCellular
iPhone11ProMax
iPhoneSESecondGen
iPadProSecondGen
iPadProSecondGenCellular
iPadProFourthGen
iPadProFourthGenCellular
iPhone12Mini
iPhone12
iPhone12Pro
iPhone12ProMax
iPadAir4
iPadAir4Cellular
iPadEighthGen
iPadEighthGenCellular
WatchSE
WatchSECellular
Watch6
Watch6Cellular
iPadProThirdGen
iPadProThirdGenCellular
iPadProFifthGen
iPadProFifthGenCellular
iPhone13Pro
iPhone13ProMax
iPhone13Mini
iPhone13
iPadMiniSixthGen
iPadMiniSixthGenCellular
iPadNinthGen
iPadNinthGenCellular
Watch7
Watch7Cellular
iPhoneSEThirdGen
iPadAirFifthGen
iPadAirFifthGenCellular
iPhone14
iPhone14Plus
iPhone14Pro
iPhone14ProMax
Watch8
Watch8Cellular
WatchUltra
WatchSESecondGen
WatchSESecondGenCellular
iPadTenthGen
iPadTenthGenCellular
iPadPro11FourthGen
iPadPro11FourthGenCellular
iPadProSixthGen
iPadProSixthGenCellular
Pricing by country
| Country | Price |
|---|---|
| Canada | 2.99 CAD |
| China | 15 CNY |
| France | 1.99 EUR |
| Germany | 1.99 EUR |
| Italy | 1.99 EUR |
| Netherlands | 1.99 EUR |
| Portugal | 1.99 EUR |
| Spain | 1.99 EUR |
| Poland | 2.29 EUR |
| UK | 1.99 GBP |
| India | 199 INR |
| Japan | 300 JPY |
| Korea, Republic Of | 3300 KRW |
| Poland | 9.99 PLN |
| Russia | 199 RUB |
| Turkey | 99.99 TRY |
| USA | 1.99 USD |
| Korea, Republic Of | 2.19 USD |
| Ukraine | 1.99 USD |
Version History
Latest: 3.3.3
APPLE WATCH SUPPORT! Plus three phase total watt entry with back calculation added
v2.1
6 days ago
Reviews
All reviews →Great
Great app, so easy to use!! Saves tons of time. Love the three phase value calculator!!!!!
3 Phase Values At Last!
Great app. The only app that Ive found that properly calculates 3 phase values.
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.
Draftmen
This is a very good calculator one of the best I have ever used . Very well done.
awesome
works just like described, it does 3phase and single phase. Its also iphone and ipad compatible. 5 start app all the way
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+
Sparky
A lot of better free apps out there! Waste of money! Wish I can take my Money back.
