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.

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.

Convert capacitor markings to actual values with a single click

Enter a 1-3 digit code from the capacitor marking

Tolerance Letter

Result

Picofarads (pF)

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Nanofarads (nF)

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Microfarads (µF)

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3-Digit Code

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Tolerance

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Unit Converter

pF = nF = µF

Common Capacitor Codes

Tolerance Codes

Features

Decode 3-digit codes (104, 473, etc.) to pF, nF, and µF — or encode values back to codes Tolerance letter decoder (B=0.1pF, C=0.25pF, D=0.5pF, F=1%, G=2%, J=5%, K=10%, M=20%) Voltage rating code table and series/parallel capacitance calculator Runs in your browser — works offline

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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Who is this tool for?

🔌 Electronics Enthusiasts

Published 06 Apr 2026 Updated 21 May 2026