Electrical resistivity converter

Supported units are ohm-metres, ohm-centimetres, microohm-centimetres, and ohm circular-mil per foot, plus everyday aliases such as Ω·m, ohm-m, Ω·cm, μΩ·cm, microohm-cm, and Ω·cmil/ft.

What the resistivity converter returns and which units it understands

A resistivity conversion answers a narrow question: given a material resistivity magnitude in one published unit, what is the equivalent magnitude in another unit that people print on conductor tables, semiconductor datasheets, plating specs, and laboratory reports. This calculator accepts a numeric value, a source unit, and a target unit, then returns the converted result rounded to a stable precision, the canonical from and to identifiers, human-readable labels, the intermediate value in ohm-metres, and the SI factors used for the bridge. Everyday spellings such as ohm-metre, ohm-meter, Ω·m, ohm-cm, Ω·cm, μΩ·cm, microohm-cm, and Ω·cmil/ft normalize to those ids so forms, query strings, and spreadsheets can reuse the same contract without inventing private enums. Canonical ids are ohm_m for the SI ohm-metre, ohm_cm for the ohm-centimetre, uohm_cm for the microohm-centimetre widely used for metals, and ohm_cmil_ft for the American wire unit ohm circular-mil per foot. There is no approximate temperature-coefficient path and no bulk resistance model of a particular wire length: the engine either multiplies and divides by fixed factors inside the supported magnitude range or rejects the input with invalid_input. Rejected cases include missing value, from, or to; non-finite numbers; magnitudes above the documented ceiling; and any unit string that is not on the supported list.

How factors are defined and how results stay reproducible

Optional scientific notation on the value string is allowed when it parses as a finite decimal; embedded spaces, hex prefixes, and non-numeric tokens are rejected with a clear message so a bad cell does not become a wrong materials entry. Zero is a valid value and simply yields zero in the target unit. Computation multiplies value by the source factor in ohm-metres, then divides by the target factor: one ohm-centimetre is exactly one hundredth of an ohm-metre; one microohm-centimetre is exactly ten to the minus eight ohm-metres; one ohm circular-mil per foot is exactly one point six six two four two six one one three times ten to the minus nine ohm-metres, matching the geometric definition of a circular mil and a foot in SI. The preferred fields are value for the resistivity magnitude, from for the source unit, and to for the target unit, with aliases amount, resistivity, rho, and quantity for the value, unit, from_unit, source, and input_unit for from, and target, to_unit, output_unit, and into for to so heterogeneous clients can share one contract. An optional precision field, with aliases decimals and dp, chooses how many decimal places to expose for value, result, and value_ohm_m, defaulting to ten and capped at fifteen so JSON goldens stay stable. Pair the free browser run on this page with the priced API when you need the identical mathematical result inside an automated pipeline without re-implementing unit tables yourself.

Where resistivity conversion fits in materials, wire tables, and software

On this page the work runs entirely in your browser; through the API each successful lookup costs $0.002, failed validation is not charged, and nothing is stored after the response returns. That split — free interactive exploration and a priced, identical API — matches the rest of the KIT tier-A catalog and lets you move from a classroom demo to an automated pipeline without changing the mathematical result.