WireGaugeCalc Free calculator · NEC cited · works offline
Electrician Calculator Software
Electrician calculator software is simple with WireGaugeCalc, since one page covers wire size, voltage drop, conduit fill, box fill, and ampacity.
You pick a calculator, enter the circuit details, and read the result, so you skip the paper tables.
That keeps the math on your phone where the work happens.
Open the calculatorEnter any two values and read the rest.
Ohm’s law: V = I × R and P = V × I. Field aid only, verify against the current NEC and your local authority having jurisdiction.
Tools Built For The Trade
Each calculator uses NEC values, so the answer matches the code you install to.
Results show the conductor, fill percent, or box volume plainly, since clear output saves a second trip to the truck.
You can run several quick checks back to back without reloading.
Calculators In The Toolset
The software groups the daily math into one place:
- Wire size by NEC 310.16 and termination temp
- Voltage drop with the 3% branch-circuit target
- Conduit fill at 40% for EMT, PVC, and RMC
- Box fill counts under NEC 314.16(B)
- Ampacity by the 60, 75, and 90 degree C columns
- Copper and aluminum conductor options
One app for every NEC calculation
WireGaugeCalc keeps the calculations you reach for most in one place:
- Voltage drop and wire sizing for any run
- Conduit fill for EMT, PVC, and RMC
- Box fill and junction box sizing
- Ampacity and temperature derating
- Motor circuit and load calculations
- Conduit bend offsets and saddles
Built for the field, works offline
The whole app runs on your phone, so it keeps working in a basement, an attic, or a job site with no signal.
There is no account to create and nothing to load. Open it, run the number, and get back to work.
- No signup and no signal needed
- Answers in a tap, not a spreadsheet
- Same tool on phone, tablet, and desktop
Every result cites the NEC article
Each answer shows the table or formula it came from, so you can check the method and learn the code as you go.
That makes the app useful on the job and during exam prep, since the reasoning is right next to the number.
Switch the code year your job runs on
Jurisdictions adopt the NEC at different times, so you can match the calculation to the code in force:
- NEC 2017, 2020, and 2023 tables
- Copper and aluminum conductors
- 60, 75, and 90 degree C terminations
- Single-phase and three-phase systems
Run the number, then get back to work
Stop flipping through a paper book or hopping between calculator sites. Enter your values, read the code-cited answer, and move on. Free to use, no signup.
Open the calculatorFrequently asked questions
Do I need to install anything to use the software?
No, it runs in your browser on a phone, tablet, or laptop. There is nothing to download or update.
Are the results accurate enough for an inspection?
They follow NEC tables and give a reliable starting point. Confirm the final numbers against the current NEC and your local authority having jurisdiction before you close it out.
Is WireGaugeCalc free to use?
Yes. Every calculator is free to run with no signup. A paid tier adds saved projects, PDF reports, and extra code years, but the core math stays free.
Does it work without internet?
Yes. The app runs on your device, so it keeps working with no signal on a job site, in a basement, or in an attic.
Are the results code accurate?
Results follow published NEC tables and standard formulas, and each answer shows the article it came from. It is a field aid, not a stamp of approval, so verify against the current code and your local authority before you wire anything.
Which NEC code year does it use?
You can switch between NEC 2017, 2020, and 2023, since jurisdictions adopt the code at different times. Pick the year your job runs on.