Convert Ohm Square Millimetres per Metre to MΩ·cm

Formula

MΩ·cm = Ω·mm²/m ÷ 10000000000

Derivation from SI units:

• 1 Ω·mm²/m = 10⁻⁶ Ω·m (resistance in Ω of a 1 m wire with 1 mm² cross-section)
• 1 MΩ·cm = 10⁶ Ω·cm = 10⁴ Ω·m
• 1 Ω·mm²/m = 0.000001 Ω·m ÷ 10000 Ω·m per MΩ·cm = 1 × 10⁻¹⁰ MΩ·cm

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

Worked examples

1. A reading of 0.0282 Ω·mm²/m converts to 2.82 × 10⁻¹² MΩ·cm.
   0.0282 Ω·mm²/m × 1 × 10⁻¹⁰ = 2.82 × 10⁻¹² MΩ·cm
2. A value of 0.72 Ω·mm²/m is 7.2 × 10⁻¹¹ MΩ·cm.
   0.72 Ω·mm²/m × 1 × 10⁻¹⁰ = 7.2 × 10⁻¹¹ MΩ·cm

Where it's used

Ohm Square Millimetres per Metre are used for cable and wire resistance (R = ρ × length ÷ mm²), while megaohm centimetres appear in ultrapure and deionised water (18.2 MΩ·cm). Both measure electrical resistivity, so the conversion is a fixed factor.

Ohm Square Millimetre per 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.