Capacitor Code Calculator
Decode a capacitor's printed code into its capacitance value.
Result
100 nF
pF: 100000
nF: 100
µF: 0.1
Usage examples
Decoding the code printed on a ceramic capacitor
Enter a code like '104' printed on the component to instantly see its actual capacitance value.
Comparing pF, nF, and µF at once
Enter one code and see it converted to picofarads, nanofarads, and microfarads simultaneously.
Checking a tolerance rating
Use the tolerance letter at the end of a code (like J, K, or M) to see the capacitor's allowed tolerance range.
Frequently asked questions
Is what I enter sent to a server?
No. All calculations happen entirely in your browser and are never sent to a server.
Why does '104' mean 100nF?
104 is a standard capacitor code where the first two digits (10) are the significant figures and the last digit (4) is a power-of-10 multiplier, both in picofarads. 10 × 10⁴ = 100,000pF = 100nF = 0.1µF.
What does the letter at the end of a code (B, J, K, etc.) mean?
It's a standard letter indicating the capacitance tolerance. For example, J means ±5% and K means ±10%.
How do I read notation like '4n7'?
Unit letters like n (nano), p (pico), and u (micro) stand in for the decimal point. 4n7 means 4.7nF.