Conversion method
Current per cross-sectional area (A/m²). This differs from sheet current density A/m.
A/cm² = x × 0.0001
10 A/m² = 0.001 A/cm².
| A/m² | A/cm² |
|---|---|
| 1 | 0.0001 |
| 5 | 0.0005 |
| 10 | 0.001 |
| 25 | 0.0025 |
| 50 | 0.005 |
| 100 | 0.01 |
Unit definitions and sources
Current per cross-sectional area (A/m²). This differs from sheet current density A/m.
| Unit and system | Use | Definition | Relationship |
|---|---|---|---|
| Ampere per meter² (A/m²); si | Common units | Ampere per meter²: base (a-m) = value × 1. Common use: Surface Current Density. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Ampere per centimeter² (A/cm²); si | Common units | Ampere per centimeter²: base (a-m) = value × 10000. Common use: Surface Current Density. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Ampere per millimeter² (A/mm²); si | Specialist units | Ampere per millimeter²: base (a-m) = value × 1000000. Common use: Surface Current Density. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Milliampere per meter² (mA/m²); si | Specialist units | Milliampere per meter²: base (a-m) = value × 0.001. Common use: Surface Current Density. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Ampere/square inch (A/(in²)); other | Specialist units | ampere/square inch = 1550.0031000062002 a-m, derived from the component SI/customary definitions. Common use: Surface Current Density. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
Sources: NIST: SP 811 Appendix B.8: conversion factors; BIPM: SI prefixes
Precision of surface current density conversions
All 5 surface current density units convert through Ampere per meter² (A/m²). 5 have an exact defined relationship to the base unit and 0 are conventional or measured values. Results and the tables on this page come from the same engine, so a table value can be checked against the converter directly.
Standard display shows up to six decimal places, switching to scientific notation for very large or small values. Calculation uses JavaScript binary floating point independently of display rounding, so extra digits are not a claim about measurement accuracy. Each unit lists its own source; a citation records where the definition comes from, not an independent review. See Conversion methodology for the review and correction process.