Free Online Tool
Resistor Color Code Calculator
Select the first digit, second digit, multiplier, and tolerance colors to read a 4-band resistor.
The result will appear here.
How to Use
- Choose the first and second band colors.
- Choose multiplier and tolerance colors.
- Review resistance value and tolerance.
Examples
- Brown-black-red-gold is 1kΩ ±5%
- Yellow-violet-orange-gold is 47kΩ ±5%
Calculation and Conversion Notes
This calculator uses the 4-band resistor standard. Resistance is calculated as `(first digit × 10 + second digit) × multiplier`. Tolerance is displayed from the fourth band color.
FAQ
Does Resistor Color Code Calculator save my input?
No. Your input is not stored on a server. Supported actions run in your browser.
Can I use it on mobile?
Yes. The pages are responsive and work on desktop and mobile browsers.
Can I rely on the result?
Use the result as a quick reference. Important work should be checked separately.