WireGaugeCalc Free calculator · NEC cited · works offline
Range Wire Size
Range wire size is simple with WireGaugeCalc, since you enter the range load and the tool returns the conductor and breaker.
It reads the ampacity from NEC 310.16 for copper or aluminum at the termination temperature, so the wire matches the rating of the lugs.
You get a clear size for the 240V circuit at once, which makes wiring a kitchen range straightforward.
Open the calculatorSmallest conductor whose ampacity meets the load, NEC Table 310.16. Field aid only, verify against the current NEC and your local authority having jurisdiction.
Sizing the Conductor for an Electric Range
A 40A circuit on 8 AWG copper covers many ranges, while larger units may need a 50A circuit on 6 AWG.
Since the lugs usually carry a 75-degree rating, the calculator reads the 75-degree column so the wire is not over-rated.
It adjusts for copper or aluminum, so an aluminum feeder gets the larger size it needs for the same load.
What the Range Circuit Calculator Needs
Give the tool these values and it sizes the wire:
- Range nameplate load in amps or watts
- Copper or aluminum conductor
- Termination temperature, usually 75 degrees Celsius
- Suggested conductor size in AWG
- Matching breaker size for the circuit
- Ground conductor size for the run
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
Can a 40A circuit feed an electric range?
Yes, many freestanding ranges run on a 40A circuit with 8 AWG copper. Confirm the load against the range nameplate and the current NEC before you size the wire.
What size wire does a 50A range need?
A 50A range circuit usually takes 6 AWG copper at the 75-degree column. Aluminum runs one size larger, and your local authority having jurisdiction may have added rules.
Why does the calculator use the 75-degree column?
Most breakers and range terminals carry a 75-degree rating, so the conductor ampacity is read from that column in NEC 310.16. Using a hotter column could over-rate the wire for the termination.
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.