Resistor Color Code Calculator
Determine the value of a resistor based on its color bands.
Calculator Inputs
Results
Resistance Value
1 kΩ ±5%
Valid Range: 950 Ω to 1.05 kΩ
How to Read Resistor Color Codes
Resistors use a system of colored bands to indicate their resistance value and tolerance. This calculator automates the process. Simply select the number of bands on your resistor and choose the color for each band from left to right.
Frequently Asked Questions
How do I read a 4-band resistor?
The first two bands represent the significant digits, the third band is the multiplier (the power of 10 to multiply by), and the fourth band is the tolerance.
How is a 5-band resistor different?
A 5-band resistor is more precise. The first three bands are significant digits, the fourth is the multiplier, and the fifth is the tolerance. They are often used when more accuracy is needed.
What if there is no tolerance band?
If the fourth band on a 4-band resistor is missing, the tolerance is assumed to be ±20%.