Convert Coulombs per foot to Coulombs per metre
Convert Coulombs per foot (C/ft) to Coulombs per metre (C/m) instantly and accurately.
Conversion Formula
C/m = C/ft × 3.280839895
About Coulombs per foot
The coulomb per foot (C/ft) equals exactly 1/0.3048 C/m ≈ 3.2808 C/m, used in North American electrical engineering for charge per unit length on power cables and conductor specifications. High-voltage DC cable charge density ratings are sometimes quoted in C/ft in ANSI/NEMA specifications; lightning protection standards may express charge density per foot of conductor. 1 C/ft = 1/0.3048 C/m ≈ 3.2808 C/m.
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.
Quick Reference Table
| Coulombs per foot (C/ft) | Coulombs per metre (C/m) |
|---|---|
| 1 C/ft | 3.28084 C/m |
| 2 C/ft | 6.56168 C/m |
| 5 C/ft | 16.4042 C/m |
| 10 C/ft | 32.8084 C/m |
| 25 C/ft | 82.021 C/m |
| 50 C/ft | 164.042 C/m |
| 100 C/ft | 328.084 C/m |