Resistor Colour Code Calculator

Read the value straight off the bands. Pick the colours in order and the resistance, tolerance and the range it is actually guaranteed to fall within all appear below.

Number of bands

Resistance --

Shop resistors

The formula

value = (digit bands as a number) x multiplier

4 band:  digit digit  multiplier  tolerance
5 band:  digit digit digit  multiplier  tolerance
6 band:  as 5 band, plus temperature coefficient

How it works

The first two or three bands are digits, the next is the power of ten to multiply by, and the last is how far from that value the part is allowed to be.

Gold and silver appear in two roles. As a multiplier they mean x0.1 and x0.01, which is how you get resistances below 10 ohms. As a tolerance band they mean 5% and 10%.

Read from the end with the bands grouped closest together. If it is ambiguous, measure it — a meter settles it faster than an argument.

More calculators

Resistor colour code
Ohm's law
Voltage divider
Resistors in series
Resistors in parallel
LED resistor
Battery runtime
Capacitor code
Battery pack (S/P)
Stepper steps per mm
NTC thermistor
RC filter
555 timer
LED strip power

All calculators

Resistor Colour Code Calculator

+91 81231 09966

Customer Service

Our company

Calculators

Recently Viewed Products

+91 81231 09966