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How to use this calculator

1. Type the code printed on the ceramic capacitor (e.g. 104, 223, 4R7 or 104K).
2. The value in pF, nF and µF appears instantly, with the tolerance letter if present.

How capacitor codes work

Small ceramic capacitors are marked with a 3-character code. The first two digits are the significant figures and the third is the number of zeros (the power-of-ten multiplier), giving a value in picofarads (pF):

A letter R stands for a decimal point (so 4R7 = 4.7 pF). One- and two-digit codes are read directly in pF. A trailing letter indicates the tolerance.

Common codes

常见问题

What does 104 mean on a capacitor?

10 followed by 4 zeros in picofarads: 100,000 pF = 100 nF = 0.1 µF.

What does the K mean, like in 104K?

The trailing letter is the tolerance — K means ±10% (J is ±5%, M is ±20%).

How do I read 4R7?

The R is a decimal point, so 4R7 = 4.7 pF.