Ohm Metre (Ω·m)
The ohm metre is the SI unit of resistivity (ρ), the property that sets how strongly a material resists current: R = ρL/A. Copper is about 1.72 × 10⁻⁸ Ω·m at 20 °C.
Symbol: Ω·m (ASCII: ohm*m)
Quantity: electrical resistivity
SI relation: Ω·m is the coherent SI unit of electrical resistivity.
Derivation: The SI unit of electrical resistivity: resistance (Ω) × cross-section (m²) ÷ length (m)
Exact: yes, by definition
Typical uses
- Conductor and alloy data sheets
- Semiconductor and soil resistivity
- Wire resistance calculations (R = ρL/A)
Convert ohm metres to other units
| Conversion | 1 Ω·m equals | Reverse |
|---|---|---|
| ohm metre to microohm centimetre | 100000000 µΩ·cm | microohm centimetre to ohm metre |
| ohm metre to ohm centimetre | 100 Ω·cm | ohm centimetre to ohm metre |
| ohm metre to ohm square millimetre per metre | 1000000 Ω·mm²/m | ohm square millimetre per metre to ohm metre |
| ohm metre to megaohm centimetre | 0.0001 MΩ·cm | megaohm centimetre to ohm metre |
| ohm metre to microohm metre | 1000000 µΩ·m | microohm metre to ohm metre |
| ohm metre to nanoohm metre | 1000000000 nΩ·m | nanoohm metre to ohm metre |
| ohm metre to ohm circular mil per foot | 601530493.6 Ω·cmil/ft | ohm circular mil per foot to ohm metre |
| ohm metre to kiloohm centimetre | 0.1 kΩ·cm | kiloohm centimetre to ohm metre |
Open the Electrical Resistivity Converter to convert any value between all units.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures .
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Ohm Metre (Ω·m). Retrieved October 25, 2026, from https://scientificconverters.com/units/ohm-meter/
IEEE
Scientific Converters, "Ohm Metre (Ω·m)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/ohm-meter/