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Resistor colour code calculator
Read a resistor's value from its colour bands (4, 5 or 6 bands), or find the bands for a value.
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- Works on any device
About Resistor colour code calculator
Read the value of a resistor from its colored bands on 4, 5 or 6 band parts, or work backwards to find the bands for a value. In a 4 band resistor the first two bands are digits, the third is the multiplier and the fourth is tolerance, with gold meaning 5 percent.
How to use Resistor colour code calculator
- Enter your numbers above.
- The result updates instantly as you type.
- Change any value to compare different cases.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Available in 10 languages.
Also known as
Frequently asked questions
How do I know which end to start reading from?
Start from the end with bands closer together, away from the tolerance band. A gold or silver band is almost always the last one.
Is Resistor colour code calculator free?
Yes. Resistor colour code calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.