Convert Nanoohm Metres to Ohm Circular Mils per Foot

Formula

Ω·cmil/ft = nΩ·m × 0.6015304935757

or Ω·cmil/ft = nΩ·m ÷ 1.662426112525

Derivation from SI units:

• 1 nΩ·m = 10⁻⁹ Ω·m = 0.1 µΩ·cm
• 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 nΩ·m = 1 × 10⁻⁹ Ω·m ÷ 1.662426112525 × 10⁻⁹ Ω·m per Ω·cmil/ft = 0.6015304935757 Ω·cmil/ft

Both units are defined exactly, so the factor is exact. Nanoohm Metre definition: nanoohm metre; Ohm Circular Mil per Foot definition: ohm circular mil per foot.

Worked examples

1. A reading of 26.5 nΩ·m converts to 15.94055808 Ω·cmil/ft.
   26.5 nΩ·m × 0.6015304936 = 15.94055808 Ω·cmil/ft
2. A value of 100 nΩ·m is 60.15304936 Ω·cmil/ft.
   100 nΩ·m × 0.6015304936 = 60.15304936 Ω·cmil/ft

Where it's used

Nanoohm Metres are used for physics and materials handbooks, 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.

Nanoohm Metre 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.