Resistor color code calculator
Pick the band colors in order, starting from the band closest to one end of the resistor. The tool reads the value, tolerance and (for six bands) the temperature coefficient.
Reverse lookup: value to colors
How the numbers are worked out
The colors follow IEC 60062, as tabulated on Wikipedia’s Electronic color code page. Black to white stand for digits 0 to 9. A 4-band resistor has two digits, a multiplier and a tolerance; a 5-band or 6-band resistor has three digits, a multiplier and a tolerance, and the 6-band adds a temperature coefficient in ppm per kelvin. The multiplier band gives the power of ten, with gold meaning ×0.1 and silver ×0.01. With no tolerance band the standard gives ±20%. A resistor can be read from either end, so confirm the direction: the tolerance band is usually set slightly apart from the others, and gold or silver is typically on the tolerance end. Real parts do not always follow the four-or-five-band rule, so measuring with a multimeter settles any doubt.