Physics & Engineering
Resistor Color Code
4-band value (first two digits × multiplier).
Educational estimates only. Not medical, legal, tax, or financial advice.
Guide: Resistor Color Code
What it does
Combines digit bands and multiplier into resistance.
How to use it
Select band colors or digit values as provided, then decode.
Formula
R = (10×d1 + d2) × multiplier.
Example
Bands 4–7–×100 → 4700 Ω.
FAQs
What about 5-band precision?
This simplified tool focuses on a basic 4-band decode.
Reading direction?
Tolerance band is often gold/silver on the right—orient accordingly.
Surface-mount codes?
SMD uses numeric codes; this page targets axial color bands.