Resistor Color Code Calculator (4-Band)
Science ToolsRead the value of a 4-band resistor
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All history →Resistor Color Code Calculator (4-Band) — at a glance
Choose the four colour bands and read the value.
Brown, Black, Red, Gold
Calculate
1 kohm ±5%
How to use it — step by step
Just your input — nothing to install or sign up for.
1
Enter your values
Fill in the boxes. Sample values are already there so you can see how it works.
2
Calculate
Press the button to get your answer instantly.
3
Read the result
The main answer is shown in a large card with extra details below it.
4
Copy it
Use the copy button to save the result anywhere.
Pro tips
Small things that make the result better.
✦Hold the resistor so the gold or silver band is on the right, then read from the left.
✦The first two bands are digits, the third is the multiplier and the fourth is the tolerance.
Quick facts
Freeno signup, no limit
Instantresult in a moment
Privatenothing is uploaded
Any devicephone, tablet or PC
Frequently Asked Questions
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.
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