Convert Coulombs per square metre to Coulombs per square foot
Convert Coulombs per square metre (C/m²) to Coulombs per square foot (C/ft²) instantly and accurately.
Conversion Formula
C/ft² = C/m² × 0.09290304
About Coulombs per square metre
The coulomb per square metre (C/m²) is the SI coherent unit of surface charge density, equal to 1 A·s·m⁻². A parallel-plate capacitor with 1 C/m² on each plate produces a gap field of 1/ε₀ ≈ 113 GV/m; realistic capacitor plate densities are 10-100 µC/m²; charge density on a sphere at electrical breakdown of air is about 27 µC/m². 1 C/m² = 10³ mC/m² = 10⁶ µC/m².
About Coulombs per square foot
The coulomb per square foot (C/ft²) equals exactly 1/(0.3048)² C/m² ≈ 10.7639 C/m², used in North American electrostatic specifications for insulating flooring, workbench surfaces, and static-dissipative materials. ANSI/ESD standards specify electrostatic charge decay and surface charge limits in C/ft²; antistatic mat and flooring performance is rated in C/ft². 1 C/ft² ≈ 10.764 C/m².
Quick Reference Table
| Coulombs per square metre (C/m²) | Coulombs per square foot (C/ft²) |
|---|---|
| 1 C/m² | 0.092903 C/ft² |
| 2 C/m² | 0.185806 C/ft² |
| 5 C/m² | 0.464515 C/ft² |
| 10 C/m² | 0.92903 C/ft² |
| 25 C/m² | 2.32258 C/ft² |
| 50 C/m² | 4.64515 C/ft² |
| 100 C/m² | 9.2903 C/ft² |