Resistor Color Code Calculator
Brown-black-red-gold shouldn't require a mnemonic you've forgotten. Photograph the resistor and get the value, tolerance and band-by-band math — no color-code chart required.
How to use the Resistor Color Code Calculator
- Upload or paste your photo — drag & drop, browse your files, or capture directly with your camera.
- Add any optional details in the form that could help the analysis.
- Press Submit — CoolMind reads the image and answers in seconds.
- Rate the tool or leave a comment to help others find it.
Why use this Resistor Color Code Calculator?
- 4, 5 and 6-band resistors decoded
- Value, tolerance and temp coefficient computed
- Band-by-band breakdown so you learn the code
- Free — perfect for students and makers
Frequently asked questions
Which band do I start reading from?
Start from the band closest to one end, with the tolerance band (often gold/silver) on the right — the tool confirms orientation from your photo.
Is this tool really free?
Yes — like every AICoolHub tool it is 100% free, unlimited, and works without any sign-up. Just open the page and use it.