Resistor Color Code Calculator
Decode 4-, 5- and 6-band resistor colour codes.
Runs in your browser — nothing is uploaded—
Details
For learning, hobby and prototyping use. Not professional electrical design advice — follow applicable codes and standards.
How to use Resistor Color Code Calculator
- Enter your values — the unit for each field is shown next to it.
- The result updates instantly as you type.
- Copy the results, or change inputs to compare scenarios.
Formula & assumptions
Value = digits × multiplier (± tolerance)
Example: Yellow–violet–red–gold = 47 × 100 = 4.7 kΩ ±5%.