Amperes per square millimeter to circular mils per amp
Type a value in A/mm² to get it in cmil/A instantly.
493.4cmil/A
That's 1.33× as hard-worked as a transformer winding, while house cable at full load is 2× higher. Through ordinary 2.5 mm² cable that is 10 A.
Convert the other way: cmil/A to A/mm²
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 A/mm² to cmil/A
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 A/mm² = 493.381 cmil/A.
Every unit
Your current density in every unit
Tables
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 |
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 |
Quick answers
Quick answers
- How many cmil/A is 1 A/mm²?
- 1 A/mm² is 1,973.53 cmil/A.
- How many cmil/A is 10 A/mm²?
- 10 A/mm² is 197.353 cmil/A.
- How many cmil/A is 4 A/mm²?
- 4 A/mm² is 493.381 cmil/A.
The units
About these units
Amperes per square millimeter (A/mm²)
The practical unit for wires and windings.
Circular mils per amp (cmil/A)
How US electricians size conductors. Higher runs cooler.
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