WireGaugeCalc Free calculator · NEC cited · works offline
10 Ga Wire Amp Rating
10 ga wire amp rating is simple with WireGaugeCalc, since you pick the material and temperature column and it shows the rated current for 10 AWG.
The values come from NEC 310.16 so the number matches the code book.
You see at a glance what a 10 AWG conductor can carry before you set the breaker.
Open the calculatorAllowable ampacity from NEC Table 310.16 at the chosen termination temperature. Field aid only, verify against the current NEC and your local authority having jurisdiction.
Read the 10 AWG ampacity by column
Copper 10 AWG is rated 30 amps at 60 and 75 degrees C, and 40 amps in the 90 degree C column.
Aluminum 10 AWG is rated 25 amps at 60 degrees C and 30 amps at 75 and 90, since aluminum carries less current.
The tool shows each value so you connect to the right termination rating.
What the 10 AWG rating depends on
A few inputs change the answer for 10 AWG wire:
- Copper versus aluminum conductor
- 60, 75, or 90 degree C termination column
- Common 30 amp copper rating at the 75 column
- 40 amp copper value used for derating
- Aluminum values for the same size
- Ampacity pulled from NEC 310.16
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 I put 10 AWG copper on a 40 amp breaker?
Usually no, even though the 90 degree C column lists 40 amps. That column is generally for derating, and the standard rating for 10 AWG copper at a 75 degree C termination is 30 amps. Verify with the current NEC and your local authority having jurisdiction.
What amperage is 10 AWG copper rated for at the 75 degree column?
10 AWG copper is rated 30 amps in the 75 degree C column of NEC 310.16, which is the value most installations use.
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.