Convert Nanoohm Metres to Ohm Square Millimetres per Metre

Formula

Ω·mm²/m = nΩ·m ÷ 1000

Derivation from SI units:

• 1 nΩ·m = 10⁻⁹ Ω·m = 0.1 µΩ·cm
• 1 Ω·mm²/m = 10⁻⁶ Ω·m (resistance in Ω of a 1 m wire with 1 mm² cross-section)
• 1 nΩ·m = 1 × 10⁻⁹ Ω·m ÷ 0.000001 Ω·m per Ω·mm²/m = 0.001 Ω·mm²/m

Both units are defined exactly, so the factor is exact. Nanoohm Metre definition: nanoohm metre; Ohm Square Millimetre per Metre definition: ohm square millimetre per metre.

Worked examples

1. A reading of 26.5 nΩ·m converts to 0.0265 Ω·mm²/m.
   26.5 nΩ·m × 0.001 = 0.0265 Ω·mm²/m
2. A value of 100 nΩ·m is 0.1 Ω·mm²/m.
   100 nΩ·m × 0.001 = 0.1 Ω·mm²/m

Where it's used

Nanoohm Metres are used for physics and materials handbooks, while ohm square millimetres per metre appear in cable and wire resistance (R = ρ × length ÷ mm²). 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 .

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