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Wire Resistance from Resistivity Calculator — result sheet
Calculate the resistance of a uniform conductor from material resistivity, length, and cross-sectional area.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: R = ρL/A, where ρ is resistivity, L is length, and A is cross-sectional area.
A longer uniform conductor has more resistance, while a larger cross-section provides more parallel paths for charge flow. Material resistivity also changes with temperature, so this calculator should be read as a stated-condition estimate rather than a complete cable ampacity or thermal-design check.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Resistivity — Ω·m; minimum 1.0E-12; maximum 1000000000000
- Conductor length — m; minimum 1.0E-12; maximum 1000000000
- Cross-sectional area — mm²; minimum 1.0E-12; maximum 1000000000000
Worked example
| Input | Value |
|---|---|
| Resistivity | 1.72E-8 |
| Conductor length | 10 |
| Cross-sectional area | 2.5 |
A 10 m uniform conductor with 2.5 mm² area and copper-like resistivity has about 0.0688 Ω resistance.
Assumptions and limits
- The conductor is uniform and the entered dimensions use the stated SI-compatible units.
- The resistivity represents the material and temperature of interest.
- The result excludes contact resistance, skin effect, temperature rise, insulation limits, and installation rules.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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