Resistor Color Code Calculator
Decode 4-band and 5-band resistor color codes
How to Use
- Select the resistor mode (4-band, 5-band, or SMD)
- Choose the color for each band from the dropdown
- Click calculate to get the resistance value
- View the resistance in ohms, kilohms, or megohms
- See the tolerance range (min and max values)
- Copy the results to your clipboard for later use
About This Tool
Our free resistor color code calculator helps you decode resistor values from color bands or find the correct colors for a desired resistance. Support for 4-band and 5-band resistors covers most through-hole resistors, while SMD code support handles surface-mount devices. The calculator displays the resistance value in appropriate units (ohms, kilohms, megohms) along with the tolerance range. Perfect for electronics hobbyists, students, engineers, and anyone working with circuits. The visual color display helps you verify the correct band colors. All calculations happen instantly in your browser with complete privacy.
Frequently Asked Questions
How do I read resistor color codes?
For 4-band resistors: the first two bands are digits, the third is the multiplier, and the fourth is tolerance. For 5-band resistors: the first three bands are digits, the fourth is the multiplier, and the fifth is tolerance.
What are the standard resistor color codes?
Standard color codes are: Black(0), Brown(1), Red(2), Orange(3), Yellow(4), Green(5), Blue(6), Violet(7), Grey(8), White(9). Multipliers include Gold(×0.1) and Silver(×0.01).
What tolerance values are available?
Standard tolerance values are: Brown(±1%), Red(±2%), Green(±0.5%), Blue(±0.25%), Violet(±0.1%), Grey(±0.05%), Gold(±5%), Silver(±10%).
Does this calculator support SMD resistors?
Yes, the calculator supports SMD (surface mount device) resistor codes. You can enter the 3 or 4-digit SMD code to get the resistance value.
