Convert electrical resistivity between ohm-metres, engineering micro scales, and the wire-design ohm-circular-mil per foot constant with grouped result sheets.
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Conversions
An electric resistivity converter rewrites one resistivity value across the material-property units common in engineering and the conductor constant used in wire-design references. It is useful when a table quotes Ω·m, a lab note uses µΩ·cm, or a cable calculation expects Ω·cmil/ft instead.
This page converts a non-negative resistivity across Ω·m, Ω·cm, Ω·mm²/m, µΩ·m, µΩ·cm, and Ω·cmil/ft.
Those units cover broad materials work, small conductor-property scales, and the wire-design constant that still appears in cable and conductor sizing references.
The converter first resolves the entered unit into ohm-metres. Every other result is then just the same resistivity restated in a scale that may be more practical for the source you are reading.
Keeping the Ω·m baseline visible helps when you move between materials-property tables and wire-design constants without losing track of the actual resistivity behind the notation.
1 Ω·cm = 0.01 Ω·m
Centimetre-based resistivity is the same quantity expressed on a shorter length basis.
1 Ω·mm²/m = 10^-6 Ω·m
The square-millimetre engineering form is common in conductor and cable work.
1 µΩ·m = 10^-6 Ω·m; 1 µΩ·cm = 10^-8 Ω·m
Micro scales make small conductor-property values easier to compare.
Resistivity is a material property. Resistance is the total effect for a particular path with a particular length and cross-section. Changing units here does not turn a property value into the resistance of a finished part or wire run.
That distinction matters because geometry can dominate the actual resistance seen in a circuit even when the material resistivity stays fixed.
This calculator does not estimate path resistance, temperature coefficients, conductivity, or voltage drop from a resistivity value. It converts the resistivity quantity itself between units only.
Use it as a planning and educational reference. If the next step depends on conductor length, area, or circuit behaviour, switch to the calculator that models that relationship directly.
Frequently asked questions
Because many conductor and alloy resistivity values are very small, and microohm-centimetre notation is often easier to read and compare than the equivalent decimal in ohm-metres.
It is a wire-design resistivity constant used in conductor sizing and legacy cable calculations. It is included here so those references can be compared directly against modern metric property units.
No. Actual resistance depends on resistivity together with conductor length and cross-sectional area. This page only converts resistivity units.
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