Convert Megaohm Centimetres to Ohm Circular Mils per Foot

Formula

Ω·cmil/ft = MΩ·cm × 6015304935757

Derivation from SI units:

• 1 MΩ·cm = 10⁶ Ω·cm = 10⁴ Ω·m
• 1 Ω·cmil/ft = (π/4 × (25.4 µm)²) ÷ 0.3048 m Ω ≈ 1.6624 × 10⁻⁹ Ω·m; a circular mil is the area of a 1-mil-diameter circle
• 1 MΩ·cm = 10000 Ω·m ÷ 1.662426112525 × 10⁻⁹ Ω·m per Ω·cmil/ft = 6015304935757 Ω·cmil/ft

Both units are defined exactly, so the factor is exact. Megaohm Centimetre definition: megaohm centimetre; Ohm Circular Mil per Foot definition: ohm circular mil per foot.

Worked examples

1. A reading of 2 MΩ·cm converts to 12030609870000 Ω·cmil/ft.
   2 MΩ·cm × 6015304936000 = 12030609870000 Ω·cmil/ft
2. A value of 15 MΩ·cm is 90229574040000 Ω·cmil/ft.
   15 MΩ·cm × 6015304936000 = 90229574040000 Ω·cmil/ft

Where it's used

Megaohm Centimetres are used for ultrapure and deionised water (18.2 MΩ·cm), while ohm circular mils per foot appear in US wire tables and AWG calculations. Both measure electrical resistivity, so the conversion is a fixed factor.

Megaohm Centimetre to other electrical resistivity units

Frequently asked questions

Sources

• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures .
• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "circular mil".
• Copper Wire Tables, NBS Handbook 100 (International Annealed Copper Standard), National Bureau of Standards (now NIST) .

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.