WireGaugeCalc The calculator app electricians keep on the truck
Every NEC calculation, in one fast app.
Wire size, voltage drop, conduit fill, box fill, and ampacity. Enter your values, read a code-cited answer, and get back to work. Free, no signup, works offline.
Field aid, not a substitute for the NEC · verify with your local authority
Smallest conductor whose ampacity meets the load, NEC Table 310.16. Field aid only, verify against the current NEC and your local authority having jurisdiction.
Search it, run it, move on
WireGaugeCalc is a set of single-purpose calculators, not a blog with a tool buried at the bottom.
The answer is the page
Each page opens with the calculator you searched for, ready to run. No scrolling past an article to reach the tool.
Cited to the NEC
Every result shows the table or formula it came from, so you can check the method and learn the code as you go.
Works offline
The math runs on your device, so it keeps working in a basement, an attic, or anywhere with no signal.
Find the calculation you need
Each group opens to pages with the calculator embedded and the code cited.
A calculator for your exact job
Each opens with the tool ready to run. Pick yours:
How it works
Pick the calculation
Wire size, voltage drop, conduit fill, box fill, or ampacity.
Enter your values
Material, size, load, length. Plain fields, no manual lookups.
Read the cited answer
Get the number plus the NEC article behind it, in a tap.
One app for every NEC calculation
WireGaugeCalc keeps the calculations you reach for most in one place:
Free to use
Every calculator is free right now. No plans, no signup. Open one and run your number.