Enter the resistor value and
choose its tolerance.
RESISTOR VALUE
—
Select resistor colours or enter
a resistance value.
RESISTANCE
—
TOLERANCE
—
MINIMUM VALUE
—
MAXIMUM VALUE
—
TEMP COEFFICIENT
—
BAND COUNT
—
Tip:
The tolerance band is often spaced
slightly farther from the other bands
and can help you determine which end
of the resistor to read first.
🎨 Resistor colour key
How resistor colour codes work
Resistors use coloured bands to represent
their resistance value and tolerance.
4-band resistor
The first two bands are significant
digits, the third is the multiplier,
and the fourth shows tolerance.
5-band resistor
The first three bands are significant
digits, followed by the multiplier
and tolerance bands.
6-band resistor
A six-band resistor uses the same first
five bands as a five-band resistor and
adds a sixth band for the
temperature coefficient,
normally expressed in parts per million
per kelvin (ppm/K).
For example, a 4-band resistor with
yellow · violet · red · gold
is:
4.7 kΩ ±5%
The tolerance tells you how far the
resistor's actual resistance may vary
from its nominal value.