Wire Gauge Conversion (AWG to mm) Quick Reference Guide
Authentic reference chart and data matrix for Wire Gauge Conversion (AWG to mm) in Jewelry & Wire Wrapping. Use the interactive table below or print it / save it as a PDF with the button below.
Quick-Reference Table
The full data from this cheat sheet, right on the page.
| Conductor Size (Copper) | 60°C Ampacity (NM-B / Romex) | 75°C Ampacity (THHN Conduit) | 90°C Ampacity (Derating Only) | Max Breaker / OCPD (NEC 240.4(D)) | 80% Max Continuous Load (NEC 210.20) | Permitted Residential / Commercial Applications |
|---|---|---|---|---|---|---|
| 14 AWG Copper (2.08 mm²) | 15 Amps | 20 Amps | 25 Amps | 15A Max Breaker (NEC 240.4(D)) | 12.0 Amps (1,440 Watts at 120 VAC) | General lighting branch circuits, 15A bedroom & living room convenience receptacles |
| 12 AWG Copper (3.31 mm²) | 20 Amps | 25 Amps | 30 Amps | 20A Max Breaker (NEC 240.4(D)) | 16.0 Amps (1,920 Watts at 120 VAC) | Kitchen small appliance circuits (NEC 210.52(B)), bathrooms, laundry rooms, outdoor GFCI |
| 10 AWG Copper (5.26 mm²) | 30 Amps | 35 Amps | 40 Amps | 30A Max Breaker (NEC 240.4(D)) | 24.0 Amps (5,760 Watts at 240 VAC) | Electric clothes dryers (NEC 220.54), 30A residential electric water heaters, 30A RV receptacles |
| 8 AWG Copper (8.37 mm²) | 40 Amps | 50 Amps | 55 Amps | 40A (60°C) / 50A (75°C) | 32.0 Amps (60°C) / 40.0 Amps (75°C) | Electric cooking ranges (up to 8.75 kW), central heat pump compressor units, 40A subpanels |
| 6 AWG Copper (13.30 mm²) | 55 Amps | 65 Amps | 75 Amps | 55A (60°C) / 60A standard OCPD (75°C) | 44.0 Amps (60°C) / 48.0 Amps (75°C, 11.52 kW) | EV Level 2 chargers (48A continuous charge requires 60A breaker per NEC 625.42), subpanel feeders |
| 4 AWG Copper (21.15 mm²) | 70 Amps | 85 Amps | 95 Amps | 70A (60°C) / 85A standard (75°C) | 56.0 Amps (60°C) / 68.0 Amps (75°C) | 100A residential subpanel feeders (75°C rated lugs), multi-circuit electric tankless heaters |
| 2 AWG Copper (33.62 mm²) | 95 Amps | 115 Amps | 130 Amps | 95A (60°C) / 100A–115A (75°C) | 76.0 Amps (60°C) / 92.0 Amps (75°C) | 100A residential main service entrance conductors (NEC 310.12), heavy workshop subpanels |
How to Use This Chart
Pin this chart where you work: it packs 7 entries and 7 columns (Conductor Size (Copper), 60°C Ampacity (NM-B / Romex), 75°C Ampacity (THHN Conduit), 90°C Ampacity (Derating Only), Max Breaker / OCPD (NEC 240.4(D)), 80% Max Continuous Load (NEC 210.20), Permitted Residential / Commercial Applications) into one printable page, built for quick lookups.
Scan down the Conductor Size (Copper) column to your item, then read across for 60°C Ampacity (NM-B / Romex), 75°C Ampacity (THHN Conduit).
Example: for 14 AWG Copper (2.08 mm²), the chart gives 60°C Ampacity (NM-B / Romex) of 15 Amps.
- Compare values down a single column to spot the pattern before you commit to a choice.
- When two rows look close, the Permitted Residential / Commercial Applications column usually breaks the tie.
- Print it once and keep it where you work — that's the whole point of a cheat sheet.
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Download Your Free Printable Sheet
Download the printable PDF below. It is the same sheet shown in the preview above, ready to print on US Letter or A4 — open it and choose Print, with Scale set to Fit to Page.
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