Resistivity is the material property behind every wire choice an electrician makes: copper's famously low resistivity is why your house is wired with it, and the numbers are quoted in ohm-meters — or, in American industry, in ohm-centimeters and microhm-inches. The conversions are straightforward: multiply Ω·m by 100 for Ω·cm, and by 39,370,078.7 for µΩ·in. Type copper's resistivity, 0.0000000168, into the Resistivity (Ω·m) box and the Ohm-centimeters (Ω·cm) readout shows about 0.00000168, while the Microohm-inches (µΩ·in) box shows about 0.661 — the figure US wire tables actually print. Aluminum runs about 60% higher, which is why aluminum feeders need thicker gauges for the same current. Transformer designers, motor winders, and grounding engineers all juggle these units when datasheets come from different countries. Resistivity also rises with temperature, so the numbers here are room-temperature references — but the unit conversion itself never changes. Semiconductor engineers run the same conversions in reverse, turning wafer spec sheets quoted in Ω·cm into the Ω·m that simulation software expects.

With the pre-filled defaults — Resistivity (Ω·m) 0 — the Electric Resistivity Converter returns Ohm-centimeters (Ω·cm) 0.0000017200, Microohm-inches (µΩ·in) 0.677165. Change any input and those results update instantly, so you can see exactly how each number you enter moves the answer.