Surface Current Density Converter
Convert between 6 current density units instantly. Enter a value, pick your units and get the result with the formula, a full conversion table and worked examples.
2 A/mm² in all current density units
Updates live as you type. Click a row to set it as the target unit.
| Unit | Symbol | Value |
|---|---|---|
| Ampere per sq metre | A/m² | 2,000,000 |
| Milliampere per sq centimetre | mA/cm² | 200,000 |
| Ampere per sq inch | A/in² | 1,290.32 |
| Ampere per sq centimetre | A/cm² | 200 |
| Ampere per sq millimetre | A/mm² | 2 |
| Abampere per sq centimetre | abA/cm² | 20 |
How to Convert Current Density Units
Current density is the current flowing per unit cross sectional area of a conductor. The SI unit is ampere per square metre (A/m²); busbar and cable design use A/mm².
Every unit on this page is stored as a fixed factor relative to one reference unit, the ampere per sq metre (A/m²). Converting is a two step multiply and divide:
- Multiply your value by the factor of the source unit to get the value in A/m².
- Divide that result by the factor of the target unit.
Ampere per sq millimetre to Ampere per sq inch conversion table
| Ampere per sq millimetre (A/mm²) | Ampere per sq inch (A/in²) |
|---|---|
| 1 A/mm² | 645.16 A/in² |
| 2 A/mm² | 1,290.32 A/in² |
| 3 A/mm² | 1,935.48 A/in² |
| 4 A/mm² | 2,580.64 A/in² |
| 5 A/mm² | 3,225.8 A/in² |
| 6 A/mm² | 3,870.96 A/in² |
| 7 A/mm² | 4,516.12 A/in² |
| 8 A/mm² | 5,161.28 A/in² |
| 9 A/mm² | 5,806.44 A/in² |
| 10 A/mm² | 6,451.6 A/in² |
| 15 A/mm² | 9,677.4 A/in² |
| 20 A/mm² | 12,903.2 A/in² |
| 25 A/mm² | 16,129 A/in² |
| 30 A/mm² | 19,354.8 A/in² |
| 40 A/mm² | 25,806.4 A/in² |
| 50 A/mm² | 32,258 A/in² |
| 75 A/mm² | 48,387 A/in² |
| 100 A/mm² | 64,516 A/in² |
| 250 A/mm² | 161,290 A/in² |
| 500 A/mm² | 322,580 A/in² |
| 1,000 A/mm² | 645,160 A/in² |
Current Density Units and Conversion Factors
Value of one unit expressed in A/m².
| Unit | Symbol | In A/m² |
|---|---|---|
| Ampere per sq metre | A/m² | 1 |
| Milliampere per sq centimetre | mA/cm² | 10 |
| Ampere per sq inch | A/in² | 1,550.0031 |
| Ampere per sq centimetre | A/cm² | 10,000 |
| Ampere per sq millimetre | A/mm² | 1,000,000 |
| Abampere per sq centimetre | abA/cm² | 100,000 |
Frequently Asked Questions
What is the SI unit of current density?
The SI unit of current density is the ampere per sq metre (A/m²). Current density is the current flowing per unit cross sectional area of a conductor.
How do I convert A/mm² to A/in²?
To convert ampere per sq millimetre (A/mm²) to ampere per sq inch (A/in²), multiply the value in A/mm² by 645.16. For example, 1 A/mm² = 645.16 A/in².
How do I convert A/cm² to A/m²?
To convert ampere per sq centimetre (A/cm²) to ampere per sq metre (A/m²), multiply the value in A/cm² by 10,000. For example, 1 A/cm² = 10,000 A/m².
How do I convert A/in² to A/mm²?
To convert ampere per sq inch (A/in²) to ampere per sq millimetre (A/mm²), multiply the value in A/in² by 0.00155. For example, 1 A/in² = 0.00155 A/mm².
Can I see a value in every current density unit at once?
Yes. Enter a value and choose the source unit; the "all units" table below the converter instantly lists the equivalent in all 6 supported units. Click any row to make it the target unit.
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