Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Electronics & Hardware Engineering
AWG Wire Ampacity Calculator — Safe Current Capacity
AWG selected from NEC ampacity table for chassis wiring at 75°C.
Recommend copper wire gauge for a target current load. Planning estimates only — verify with production tools and vendor pricing where applicable.
Inputs
1200
1500
110
Smart analysis
Recommendations
Tailored to your live inputs and result—guidance only, not professional advice.
- Interpret
Treat this as a planning estimate
Primary result: Recommended gauge = 14 AWG. Re-run with optimistic and pessimistic inputs to understand the range—not just a single point.
Scenario studio
Compare A vs B
Capture two sets of inputs on this device, then see which outcome wins. Share either scenario with a link.
Scenario A
Adjust inputs, then capture this slot.
Scenario B
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Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Current (A)
The “Current (A)” value used in this tool’s formula. Adjust it to see results update live.
Wire length (ft)
The “Wire length (ft)” value used in this tool’s formula. Adjust it to see results update live.
Max voltage drop (%)
The “Max voltage drop (%)” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
Recommend copper wire gauge for a target current load. Planning estimates only — verify with production tools and vendor pricing where applicable. AWG selected from NEC ampacity table for chassis wiring at 75°C. Example: 20 A continuous load → 12 AWG copper (25 A rating).
AWG selected from NEC ampacity table for chassis wiring at 75°C.
Example: 20 A continuous load → 12 AWG copper (25 A rating).
When to use this Wire Gauge (AWG) Ampacity
Common use cases
- Recommend copper wire gauge for a target current load.
- Sanity-check with this case: 20 A continuous load → 12 AWG copper (25 A rating).
- The relationship is: AWG selected from NEC ampacity table for chassis wiring at 75°C.
Localized examples
- Electronics & Hardware Engineering: the example on this page uses the same formula as the widget.
What you get
- Fields: Current (A), Wire length (ft), Max voltage drop (%)
- AWG selected from NEC ampacity table for chassis wiring at 75°C.
- Example on the page: 20 A continuous load → 12 AWG copper (25 A rating).
How to Calculate Wire Gauge (AWG) Ampacity Step-by-Step
- 1Enter Current (A), Wire length (ft), Max voltage drop (%). Use the values you have, not a catalog average, unless that is all you know.
- 2AWG selected from NEC ampacity table for chassis wiring at 75°C.
- 3Worked case: 20 A continuous load → 12 AWG copper (25 A rating).
- 4Compare the result to last month’s invoice or a vendor calculator before you commit capacity.
Governing formula
AWG selected from NEC ampacity table for chassis wiring at 75°C.
20 A continuous load → 12 AWG copper (25 A rating).
Example: set Current (A) = 20, Wire length (ft) = 50, Max voltage drop (%) = 3, then read the result.
Variable definitions
- currentA
Current (A)
The “Current (A)” field. Default 20; typical range 1–200.
- wireLengthFt
Wire length (ft)
The “Wire length (ft)” field. Default 50; typical range 1–500.
- maxVoltageDropPct
Max voltage drop (%)
The “Max voltage drop (%)” field. Default 3; typical range 1–10.
- Closed-form math (AWG selected from NEC ampacity table for chassis wiring at 75°C.) misses idle time, egress, packet loss, and reserved capacity on the real bill.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
AWG selected from NEC ampacity table for chassis wiring at 75°C.
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Reviews & Ratings
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4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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