About Resistor Calculator & SMD
Resistor Calculator for quick, accurate resistor calculations. Decode a resistor color code (resistor colour code) for 3 band, 4 band, and 5 band resistors, and convert an SMD resistor code into the correct resistance...
Resistor Calculator for quick, accurate resistor calculations. Decode a resistor color code (resistor colour code) for 3 band, 4 band, and 5 band resistors, and convert an SMD resistor code into the correct resistance value.
Use it during design, study, repairs, or breadboard prototyping to verify resistor values and common circuit results without doing the math by hand.
Tools included:
- 4 band / 5 band resistor color code calculator.
- SMD resistor value calculator (SMD resistor code).
- Resistors in series calculator (equivalent resistance).
- Resistors in parallel calculator (equivalent resistance).
- LED resistor calculator (pick a resistor for an LED circuit).
- Voltage divider calculator (output voltage).
- Resistivity calculator.
Designed to be simple and fast: enter the band colors or SMD marking, then get the resistance value in ohms (Ω) at a glance.
Ideal for electronics students, hobbyists, and engineers.
Previous Versions
Here you can find the changelog of Resistor Calculator & SMD since it was posted on our website on 2022-01-08 13:41:09.
The latest version is and it was updated on 2026-10-12 23:37:12. See below the changes in each version.
Resistor Calculator & SMD version
Updated At: 2026-06-14
Disclaimer
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