About The Resistor Color Code Decoder

The Resistor Color Code Decoder converts four resistor color bands into resistance and tolerance. It is useful when reading through-hole resistors on a bench, schematic, or repair job.

How to Use the Resistor Color Code Decoder Online

1. Select the first two digit bands from left to right.
2. Select the multiplier and tolerance band.
3. Decode the value and copy the result if needed.

Choosing Options Correctly

Orient the resistor so the tolerance band is last, usually separated slightly from the other bands. Confirm critical parts with a meter because resistor tolerance, aging, heat, and circuit paths can affect measured values.

Common Use Cases

• Identify unknown through-hole resistors.
• Check a part against a bill of materials.
• Verify resistor values while repairing or prototyping.

Quick FAQ

Does this support four-band resistors?
Yes, use the visible bands and tolerance option that match the resistor on the bench.

Should I still measure the resistor?
Yes. Old, overheated, or low-tolerance parts should be checked with a meter before reuse.

What if the colors are hard to read?
Try both orientations and compare the tolerance band location. Gold, brown, orange, and red can be easy to confuse on aged parts.

Can this identify power rating?
No. Color bands show resistance and tolerance, not wattage. Power rating depends on the physical package and datasheet.