Wire Resistance Calculator

How Wire Resistance works

The numerical relationship is R = resistance per meter × length. Wire Resistance uses Resistance per meter, Conductor length to report Wire resistance.

With the loaded values, wire resistance evaluates to 0.21 Ω. A second case makes the effect of one changed measurement visible.

Inputs for Wire Resistance

Resistance per meter and Conductor length belong to Wire Resistance. Keep source units with resistance per meter.

Loaded numbers demonstrate the calculation; they are not equipment recommendations. Replace them with values from the case being evaluated.

Resistance per meter

Example entry: 0.007 Ω/m.

Conductor length

Example entry: 30 m.

Reading the Wire Resistance result

This output represents Wire Resistance.

The worksheet isolates arithmetic; final ratings need a broader equipment check.

Measurement and units

Treat these results as planning arithmetic; conductor and protective-device selection must follow the applicable electrical code and equipment instructions. Check prefixes on resistance per meter.

Matching units and measurement locations prevent false differences.

Limits of this calculation

Temperature and return-path length must match the installation. Use Junction Box Fill Calculator.

The result reflects the formula scope, not every connected component. Unentered effects remain outside Wire Resistance.

A useful Wire Resistance comparison

Record wire resistance before testing a different resistance per meter value. Continue to Current-Limiting Impedance Calculator for required impedance.

Document the alternate resistance per meter source.

Wire Resistance record notes

Record source and operating details for resistance per meter. Use Grounding Voltage Rise Calculator to a separate ground potential rise calculation.

Retain raw wire resistance beside its selected rating.

Questions about Wire Resistance