Convert Microohm Metres to Ohm Circular Mils per Foot

Formula

Ω·cmil/ft = µΩ·m × 601.5304935757

Derivation from SI units:

• 1 µΩ·m = 10⁻⁶ Ω·m = 1 Ω·mm²/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 µΩ·m = 0.000001 Ω·m ÷ 1.662426112525 × 10⁻⁹ Ω·m per Ω·cmil/ft = 601.5304935757 Ω·cmil/ft

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

Worked examples

1. A reading of 0.1 µΩ·m converts to 60.15304936 Ω·cmil/ft.
   0.1 µΩ·m × 601.5304936 = 60.15304936 Ω·cmil/ft
2. A value of 1 µΩ·m is 601.5304936 Ω·cmil/ft.
   1 µΩ·m × 601.5304936 = 601.5304936 Ω·cmil/ft

Where it's used

Microohm Metres are used for resistance and heating alloys, 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.

Microohm 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.