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Electrical Resistance Calculator
Resistance of a wire from material, length and diameter.
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Wire resistance
Compare Your Options And Get Clear Answers
Resistance of a wire from material, length and diameter.
Electrical Resistance Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: R = rho L / A.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Electrical Quick Guide
Typical values for reference.
| rho | Length m | Dia mm | Resistance |
|---|---|---|---|
| 1.68 | 10 | 2 | 0.0535 ohm |
| 2.82 | 50 | 2.5 | 0.2872 ohm |
| 1.68 | 100 | 1 | 2.1390 ohm |
| 1.68 | 5 | 4 | 0.0067 ohm |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Electrical Resistance Calculator FAQ
Answers to common questions about this calculator.
Material, length and cross-sectional area.
Less area for current to flow.
Yes, resistance rises with heat.
It assumes 20 C and a solid round wire.