WireGaugeCalc Free calculator · NEC cited · works offline
How Many Amps Will 10 Gauge Wire Carry
How many amps will 10 gauge wire carry is quick to confirm with WireGaugeCalc.
You pick copper or aluminum and the termination temperature, and the calculator reads the matching NEC 310.16 ampacity value for 10 AWG.
So you stop guessing and size the breaker to the conductor that is actually allowed.
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.
Reading 10 AWG Ampacity By Termination Temperature
The number depends on the temperature column, since 10 AWG copper shows 30 amps at 60 degrees C and 35 amps at 75 degrees C.
Most breakers and lugs are rated 75 degrees C, but the device terminal rating can pull you back to the lower column.
The calculator keeps the column straight so you do not overstate the rating.
What Sets The Ampacity Of 10 Gauge Wire
A few inputs decide the amps your 10 AWG run can carry:
- Conductor material, since copper carries more than aluminum at the same size
- Termination temperature column at the breaker and the device
- Insulation type printed on the jacket, such as THHN or THWN-2
- Ambient heat and conductor bundling that trigger derating
- The 60 degrees C limit common on residential branch circuits
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
Is 10 gauge wire good for 30 amps?
Yes, 10 AWG copper is rated 30 amps in the 60 degrees C column and 35 amps at 75 degrees C. For typical 30 amp branch circuits the 30 amp figure is the one most installers use.
Why is my 10 AWG sometimes limited to the 60 degree column?
If the device or breaker terminals are rated only 60 degrees C, the conductor follows that lower column even with higher rated insulation. Always verify the listed terminal rating against the current NEC and your local authority having jurisdiction.
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.