Decode Capacitor Markings Instantly
A free browser-based capacitor code decoder that converts 3-digit ceramic and film capacitor markings to picofarads (pF), nanofarads (nF), and microfarads (µF). Includes tolerance letter codes, voltage rating codes, a unit converter, and series/parallel calculator.
Convert capacitor markings to actual values with a single click
Features
How to Decode Capacitor Codes
- Enter the code. Type the 1-3 digit number printed on the capacitor (e.g. 104, 473, 222). Optionally add the tolerance letter.
- Read the result. The decoder shows the capacitance in pF, nF, and µF simultaneously, plus tolerance and voltage if codes are provided.
- Use the converter. Switch between units or calculate total capacitance for series and parallel combinations.
FAQ
How does the 3-digit capacitor code work?
The first two digits are the significant figures. The third digit is the number of zeros to add (multiplier). The result is in picofarads (pF). Example: 104 = 10 + 0000 = 100,000 pF = 100 nF = 0.1 µF.
What do the tolerance letters mean?
Letters after the code indicate tolerance. Common ones: J = ±5%, K = ±10%, M = ±20%. Precision capacitors use: B = ±0.1pF, C = ±0.25pF, D = ±0.5pF, F = ±1%, G = ±2%.
What about the voltage code?
Some capacitors have a voltage code letter: 0G = 4V, 0J = 6.3V, 1A = 10V, 1C = 16V, 1E = 25V, 1H = 50V, 2A = 100V, 2D = 200V, 2E = 250V, 2G = 400V, 2J = 630V.
What is the difference between pF, nF, and µF?
1 µF = 1,000 nF = 1,000,000 pF. Picofarads (pF) are used for small ceramic caps, nanofarads (nF) for medium, and microfarads (µF) for large electrolytic capacitors.
How do series and parallel capacitors combine?
Parallel: total = C1 + C2 + C3 (add up). Series: 1/total = 1/C1 + 1/C2 + 1/C3 (opposite of resistors). Parallel increases capacitance, series decreases it.
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