Resistor Color Decoder
Decode nominal resistance, tolerance and optional temperature coefficient from 4, 5 or 6 bands.
Read bands in the known direction. 4 bands use two digits; 5/6 use three. First digit must not be black. Tolerance and temperature bands show only supported standard choices; gray tolerance is 0.05%. Temperature coefficient is a marking, not an operating-temperature model. No physical identification or safety assessment.
R = N × M; Rmin = R × (1 − T/100); Rmax = R × (1 + T/100)
Result
A QUICK WALKTHROUGH
How to use this tool
- Choose the mode and enter the values.
- Read the formula and limitations before interpreting the result.
Formula and limits
Read bands in the known direction. 4 bands use two digits; 5/6 use three. First digit must not be black. Tolerance and temperature bands show only supported standard choices; gray tolerance is 0.05%. Temperature coefficient is a marking, not an operating-temperature model. No physical identification or safety assessment. R = N × M; Rmin = R × (1 − T/100); Rmax = R × (1 + T/100)
GOOD TO KNOW
Common questions
Does this evaluate a real component or circuit?
No. This is a nominal calculation from the inputs, not component selection or a safety assessment.