Resistor Calculator
Resistance = (Band1×10 + Band2) × 10^Multiplier ± Tolerance%(1×10+0)×100=1000Ω=1kΩ±5%
Free online tool
Resistor Calculator
Enter the color codes for bands 1, 2, multiplier and tolerance.
Instant calculation
Resistor Calculator
Enter the color codes for bands 1, 2, multiplier and tolerance.
Your result
Calculation
Your numbers stay in this browser. Nothing is uploaded or saved.
Three clear steps
How to use this calculator
- 01
Enter band colors
Type the digit codes for bands 1 and 2 (0-9).
- 02
Enter multiplier
Type the multiplier color code (0-9).
- 03
Enter tolerance
Type the tolerance color code.
The formula
How this calculation works
Standard 4-band resistor color code decoding.
Check the method
Worked examples
Each example follows the same formula used by the calculator.
Brown(1), Black(0), Red(×100), Gold(±5%) — resistance?
(1×10+0)×100=1000Ω=1kΩ±5%1,000 Ω (1 kΩ) ±5%Common questions
Questions about this calculation
What is the Resistor Calculator?
The Resistor Calculator helps you calculate resistor value from 4-band color codes. Enter your values and select Calculate to get an instant result.
How is the result calculated?
Standard 4-band resistor color code decoding.
Can you show an example?
Example: Brown(1), Black(0), Red(×100), Gold(±5%) — resistance? — 1,000 Ω (1 kΩ) ±5%.
Is my data saved when I use the Resistor Calculator?
No. All calculations run locally in your browser. Your inputs and results are never uploaded, stored or shared with anyone.
Is the Resistor Calculator free to use?
Yes. The Resistor Calculator is completely free. No account, sign-up or payment is required. It works on mobile, tablet and desktop.
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