Convert Ohm Centimetres to Ohm Square Millimetres per Metre

Formula

Ω·mm²/m = Ω·cm × 10000

Derivation from SI units:

• 1 Ω·cm = 0.01 Ω·m
• 1 Ω·mm²/m = 10⁻⁶ Ω·m (resistance in Ω of a 1 m wire with 1 mm² cross-section)
• 1 Ω·cm = 0.01 Ω·m ÷ 0.000001 Ω·m per Ω·mm²/m = 10000 Ω·mm²/m

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

Worked examples

1. A reading of 10 Ω·cm converts to 100000 Ω·mm²/m.
   10 Ω·cm × 10000 = 100000 Ω·mm²/m
2. A value of 5000 Ω·cm is 50000000 Ω·mm²/m.
   5000 Ω·cm × 10000 = 50000000 Ω·mm²/m

Where it's used

Ohm Centimetres are used for silicon wafer resistivity (for example 1–10 Ω·cm), 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.

Ohm 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 .

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