Example field question
Use this calculator when a design review or site issue requires a quick engineering check before a detailed manufacturer selection.
VoltCheck24 Engineering Calculator
AWG to mm2 Calculator and Wire Size Conversion Table
Convert common AWG wire gauges to approximate mm2 cross-sectional area and compare resistance, ampacity, and practical use cases.
How to use this calculator
- Collect the values below from the equipment nameplate, data sheet, or field measurement.
- Enter values using one consistent unit system and use worst-case operating conditions.
- Review the result, margin, and engineering note before selecting hardware.
- Cross-check the result with the related calculator and save the review for your project record.
Input checklist
- AWG gauge number
- Metric mm2 equivalent needed
- Resistance or ampacity reference
- Manufacturer cable data sheet
Common mistakes to avoid
Do not mix nominal values with measured worst-case values. Keep units consistent and include cable, temperature, duty, and derating assumptions where applicable.
Standards and validation
Review the result against local codes, IEC/NEC/NFPA/ISO practices when applicable, project specifications, and the latest manufacturer data sheet.
Formula and Inputs
AWG conversion compares standard gauge numbers with approximate conductor cross-sectional area in square millimeters and resistance per length.
Industrial Use Cases
Use this table when switching between US AWG specifications and IEC or metric mm2 cable sizes for international projects.
Engineering Note
AWG-to-mm2 values are approximate nominal references. Always use manufacturer data for exact conductor construction, resistance, insulation, and current rating.
DC wire sizing workflow for global projects
DC wiring problems usually start with a simple question: will the load still receive enough voltage after current flows through a long conductor? VoltCheck24 treats wire size as a voltage-drop and verification workflow, not only a gauge lookup. Start with the real load current, one-way route length, system voltage, and acceptable voltage drop. Then compare the result with ampacity, fuse or breaker size, terminal limits, insulation temperature, and local code requirements.
DC source+Supply conductor resistance+Load current=Terminal voltage margin
| Use case | Common search intent | What to verify after voltage drop |
|---|---|---|
| 12V battery, RV, marine, LED | 12V wire size calculator, battery cable size | Fuse location, flame rating, vibration, wet or outdoor environment |
| 24V PLC, sensor, solenoid, IO-Link | 24V cable calculator, sensor voltage drop | Device minimum voltage, inrush current, shared returns, SMPS tolerance |
| Solar DC and off-grid wiring | solar DC cable size calculator, PV voltage drop | UV rating, connector current, temperature derating, PV code rules |
| International panel wiring | AWG to mm2, wire size calculator DC | AWG/mm2 conversion, terminal range, IEC or NEC project standard |
Important: voltage-drop calculators support preliminary sizing only. Final conductor selection must be checked against the latest local electrical code, manufacturer data sheets, protection coordination, and measured field conditions.
International AWG and mm2 conversion
Use this page when drawings, procurement, and field stock use different conductor conventions. The conversion is approximate and does not transfer a manufacturer ampacity rating.
Worked field question: Example: translate an AWG drawing into a metric procurement candidate, then confirm the exact conductor resistance and terminal compatibility from the data sheet.
FAQ
Is AWG 12 bigger than AWG 14?
Yes. In AWG, a smaller number is a larger wire. AWG 12 has a larger conductor area than AWG 14.
Is mm2 the same as SQ?
In many industrial contexts, SQ informally refers to conductor cross-sectional area in square millimeters, but final documentation should use the project standard notation.
Preliminary engineering reference only. Confirm final selections against current standards, project specifications, and manufacturer data.