Current Density Converter
Current density is how much current flows through each unit of cross-sectional area. The SI unit is the ampere per square meter. PCB and wire sizing normally works in amperes per square millimeter or per circular mil, since that is what sets conductor heating.
7 units supported Base unit ampere per square meter (A/m²)
Multiply the number of amperes per square meter by 0.0001 to get amperes per square centimeter. How this is calculated
About current density conversion
Current Density conversion is commonly needed when wire and PCB trace sizing, busbar design, and electroplating. US wire tables state area in circular mils, so ampacity is often quoted per circular mil rather than per square millimetre.
Convert Ampere per Square Meter to other current density units
1 A/m² expressed in every other current density unit on this site.
- Ampere per Square Meter A/m² 1
- Ampere per Square Centimeter A/cm² 0.0001
- Ampere per Square Millimeter A/mm² 0.000001
- Ampere per Square Inch A/in² 0.00064516
- Ampere per Square Mil A/mil² 6.4516e-10
- Ampere per Circular Mil A/cmil 5.0670748e-10
- Abampere per Square Centimeter abA/cm² 0.00001
Complete list of current density units
All 7 units this converter supports, each stated against the ampere per square meter (A/m²).
| Unit | Symbol | System | In amperes per square meter | Conversions |
|---|---|---|---|---|
| Ampere per Square Meter | A/m² | SI | base unit (A/m²) | — |
| Ampere per Square Centimeter | A/cm² | SI | 1 A/cm² = 10,000 A/m² | — |
| Ampere per Square Millimeter | A/mm² | SI | 1 A/mm² = 1,000,000 A/m² | — |
| Ampere per Square Inch | A/in² | Imperial | 1 A/in² = 1,550.00310001 A/m² | — |
| Ampere per Square Mil | A/mil² | US | 1 A/mil² = 1,550,003,100.01 A/m² | — |
| Ampere per Circular Mil | A/cmil | US | 1 A/cmil = 1,973,525,241.39 A/m² | — |
| Abampere per Square Centimeter | abA/cm² | Other | 1 abA/cm² = 100,000 A/m² | — |
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Frequently asked questions
What is the base unit for current density?
Current Density conversions on this site are calculated against the ampere per square meter (A/m²).
Which current density units can I convert?
You can convert between 7 units, including ampere per square meter, ampere per square centimeter, ampere per square millimeter, ampere per square inch, and more.
Where is current density conversion useful?
It is commonly needed when wire and PCB trace sizing, busbar design, and electroplating.
Does this converter mix measurement systems?
The converter supports SI, Imperial, US, Other units and keeps their exact definitions separate so results stay accurate.
Related categories
Conversion factors are based on internationally agreed unit definitions. See our methodology and sources for details on how these values are verified.