Free Wire Gauge Ampacity Calculator
Estimated safe current-carrying capacity by AWG size.
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Result
Ampacity (NEC Table 310.16, copper)
20 A
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Short answer
Estimated safe current-carrying capacity by AWG size.
What is the Wire Gauge Ampacity Calculator?
Estimated safe current-carrying capacity by AWG size.
How does the Wire Gauge Ampacity Calculator work?
Enter the inputs above and read the result.
Formula
Variables
Explanation
Actual safe ampacity depends on insulation type, ambient temperature, and number of current-carrying conductors.
Examples
Applications
Advantages
Limitations
Common mistakes
Tips
Related concepts
The Wire Gauge Ampacity Calculator sits inside the Everyday & Utility Calculators hub, in the science & electrical cluster. Physics, chemistry and electrical engineering formulas. Understanding the terms below makes the output easier to interpret and easier to compare against neighbouring measures.
Practical use cases and industry applications
Understanding Wire Gauge Ampacity
Estimated safe current-carrying capacity by AWG size. Within everyday & utility calculators, wire gauge ampacity belongs to the science & electrical cluster, where it shares terminology and assumptions with closely related tools.
Learning how wire gauge ampacity is calculated
Actual safe ampacity depends on insulation type, ambient temperature, and number of current-carrying conductors. Working through the variables one at a time — — makes the result reproducible by hand and easier to sanity-check.
Using wire gauge ampacity to make a decision
Because outputs depend on the assumptions you enter, run more than one scenario before committing to a figure.
How wire gauge ampacity compares with related measures
voltage, current, resistance, ampacity all describe adjacent aspects of science & electrical. Comparing this calculator's output against those measures — using the related tools listed on this page — prevents a single metric from being read in isolation.
Frequently asked questions
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