Convert Coulombs per metre to Coulombs per inch
Convert Coulombs per metre (C/m) to Coulombs per inch (C/in) instantly and accurately.
Conversion Formula
C/in = C/m × 0.0254
About Coulombs per metre
The coulomb per metre (C/m) is the SI coherent unit of linear charge density, equal to 1 A·s·m⁻¹. A typical lightning return stroke carries about 2-5 C/m along the channel; heavily charged surfaces like Van de Graaff sphere surfaces are described in C/m² (surface), but a thin wire coated with 1 C of charge per metre has a C/m linear density. Textbook Gauss's law problems routinely use C/m for infinite line-charge problems. 1 C/m = 10³ mC/m.
About Coulombs per inch
The coulomb per inch (C/in) equals exactly 1/0.0254 C/m ≈ 39.370 C/m, used in insulation specifications and dielectric withstand testing at the component level. Dielectric tape and insulating sleeve charge retention is sometimes expressed in C/in in US industry datasheets; PCB creepage and clearance charge density specifications for high-voltage designs appear in C/in. 1 C/in = 1/0.0254 C/m ≈ 39.370 C/m.
Quick Reference Table
| Coulombs per metre (C/m) | Coulombs per inch (C/in) |
|---|---|
| 1 C/m | 0.0254 C/in |
| 2 C/m | 0.0508 C/in |
| 5 C/m | 0.127 C/in |
| 10 C/m | 0.254 C/in |
| 25 C/m | 0.635 C/in |
| 50 C/m | 1.27 C/in |
| 100 C/m | 2.54 C/in |