Circular mils per amp to amperes per square millimeter
Type a value in cmil/A to get it in A/mm² instantly.
493.4A/mm²
That's 62× as hard-worked as house cable at full load, while copper wiring inside a chip is 20× higher. Through ordinary 2.5 mm² cable that is 1,233 A.
Convert the other way: A/mm² to cmil/A
What it means
How hard is the conductor working?
Wiring figures are rough guidance only. Real cable ratings depend on insulation, bundling and air temperature, so follow your local wiring rules.
The math
How to convert cmil/A to A/mm²
Current density is current ÷ cross-section. 1 A/mm² is 100 A/cm² or 10,000 A/dm², and 500 circular mils per amp is about 3.95 A/mm².
Example: 4 cmil/A = 493.381 A/mm².
Every unit
Your current density in every unit
Tables
cmil/A to A/mm² conversion table
| cmil/A | A/mm² |
|---|---|
| 0.01 cmil/A | 197,353 A/mm² |
| 0.03 cmil/A | 65,784.2 A/mm² |
| 0.1 cmil/A | 19,735.3 A/mm² |
| 0.5 cmil/A | 3,947.05 A/mm² |
| 1 cmil/A | 1,973.53 A/mm² |
| 2 cmil/A | 986.763 A/mm² |
| 3 cmil/A | 657.842 A/mm² |
| 4 cmil/A | 493.381 A/mm² |
| 5 cmil/A | 394.705 A/mm² |
| 6 cmil/A | 328.921 A/mm² |
| 8 cmil/A | 246.691 A/mm² |
| 10 cmil/A | 197.353 A/mm² |
A/mm² to cmil/A conversion table
| A/mm² | cmil/A |
|---|---|
| 0.01 A/mm² | 197,353 cmil/A |
| 0.03 A/mm² | 65,784.2 cmil/A |
| 0.1 A/mm² | 19,735.3 cmil/A |
| 0.5 A/mm² | 3,947.05 cmil/A |
| 1 A/mm² | 1,973.53 cmil/A |
| 2 A/mm² | 986.763 cmil/A |
| 3 A/mm² | 657.842 cmil/A |
| 4 A/mm² | 493.381 cmil/A |
| 5 A/mm² | 394.705 cmil/A |
| 6 A/mm² | 328.921 cmil/A |
| 8 A/mm² | 246.691 cmil/A |
| 10 A/mm² | 197.353 cmil/A |
Quick answers
Quick answers
- How many A/mm² is 1 cmil/A?
- 1 cmil/A is 1,973.53 A/mm².
- How many A/mm² is 10 cmil/A?
- 10 cmil/A is 197.353 A/mm².
- How many A/mm² is 4 cmil/A?
- 4 cmil/A is 493.381 A/mm².
The units
About these units
Circular mils per amp (cmil/A)
How US electricians size conductors. Higher runs cooler.
Amperes per square millimeter (A/mm²)
The practical unit for wires and windings.
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