Calculator KB-32
Capacitor markings: code decoder
Enter the marking on the case and the calculator will decode it for you.
Result
In brief: How to decode capacitor markings: three-digit codes, 4n7 and 1u0 notation, letter-coded tolerance, and operating voltage codes. Convert to pF, nF, and µF. Example: Capacity: 100 nF.
Calculation example
| Capacitor code | 2A104K |
|---|
| Capacity | 100 nF |
|---|---|
| In picofarads | 100 000 pF |
| In nanofarads | 100 nF |
| In microfarads | 0.1 µF |
| Tolerance | 10 % |
| Operating voltage | 100 V |
How it is calculated
4n7 = 4,7 nF, 1u0 = 1 µF
In a three-digit code, the first two digits are significant figures, the third gives the number of zeros, and the result is in picofarads. A trailing letter indicates the tolerance, while a digit and letter at the beginning indicate the operating voltage: for example, 2A means 100 V.
What to look for
- Small SMD capacitors usually have no markings at all: you can only find their capacitance with a meter.
- A code of one or two digits usually gives the capacitance directly in picofarads.
Frequently asked questions
What does the marking 104 on a capacitor mean?
10 followed by four zeros in picofarads: 100,000 pF, or 100 nF or 0.1 µF.
What does the letter at the end of a capacitor code mean?
Tolerance: J means 5%, K means 10%, and M means 20%. Code 472J means 4.7 nF ±5%.
How do you decode 2A104K?
2A means a rated voltage of 100 V, 104 means 100 nF, and K means 10% tolerance. Other codes include 1H for 50 V and 2J for 630 V.
