Conversion method
Resistivity is resistance times cross-sectional area divided by length. It is a material property at specified conditions.
Ω·cm = x × 100
10 Ω·m = 1000 Ω·cm.
| Ω·m | Ω·cm |
|---|---|
| 1 | 100 |
| 5 | 500 |
| 10 | 1000 |
| 25 | 2500 |
| 50 | 5000 |
| 100 | 10000 |
Unit definitions and sources
Resistivity is resistance times cross-sectional area divided by length. It is a material property at specified conditions.
| Unit and system | Use | Definition | Relationship |
|---|---|---|---|
| Ohm meter (Ω·m); si | Common units | Ohm meter: base (ohm-m) = value × 1. Common use: Electrical Resistivity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Ohm centimeter (Ω·cm); si | Common units | Ohm centimeter: base (ohm-m) = value × 0.01. Common use: Electrical Resistivity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Microohm centimeter (µΩ·cm); si | Specialist units | Microohm centimeter: base (ohm-m) = value × 1e-08. Common use: Electrical Resistivity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Ohm square millimeter per meter (Ω·mm²/m); si | Specialist units | Ohm square millimeter per meter: base (ohm-m) = value × 1e-06. Common use: Electrical Resistivity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Ohm inch (Ω·in); other | Specialist units | ohm inch = 0.0254 ohm-m, derived from the component SI/customary definitions. Common use: Electrical Resistivity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Microhm inch (µΩ·in); other | Specialist units | microhm inch = 2.54e-08 ohm-m, derived from the component SI/customary definitions. Common use: Electrical Resistivity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
Sources: NIST: SP 811 Appendix B.8: conversion factors; BIPM: SI prefixes
Precision of electrical resistivity conversions
All 6 electrical resistivity units convert through Ohm meter (Ω·m). 6 have an exact defined relationship to the base unit and 0 are conventional or measured values. Results and the tables on this page come from the same engine, so a table value can be checked against the converter directly.
Standard display shows up to six decimal places, switching to scientific notation for very large or small values. Calculation uses JavaScript binary floating point independently of display rounding, so extra digits are not a claim about measurement accuracy. Each unit lists its own source; a citation records where the definition comes from, not an independent review. See Conversion methodology for the review and correction process.