Wire Gauge AWG Current Capacity Calculator
Check typical current capacity (ampacity) of copper wire by AWG and see the voltage drop for a run.
Compare Your Options And Get Clear Answers
Check typical current capacity (ampacity) of copper wire by AWG and see the voltage drop for a run.
Wire Gauge AWG Current Capacity Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Results update as you change the inputs.
Review
Read the breakdown and the explanation.
Adjust
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Wire Quick Guide
Typical values for reference.
| Gauge | Typical ampacity | Diameter | Use |
|---|---|---|---|
| AWG 18 | 10 A | 1.02 mm | Chassis wiring |
| AWG 16 | 13 A | 1.29 mm | Chassis wiring |
| AWG 14 | 20 A | 1.63 mm | Chassis wiring |
| AWG 12 | 30 A | 2.05 mm | Chassis wiring |
| AWG 10 | 40 A | 2.59 mm | Chassis wiring |
| AWG 8 | 55 A | 3.26 mm | Chassis wiring |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Wire Gauge AWG Calculator FAQ
Answers to common questions about this calculator.
About 20 to 30 A depending on insulation and conditions.
No, building wiring needs local code and an electrician.
Ampacity from a standard table; voltage drop = round-trip resistance x current.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.