Capacitor Code Calculator
Enter the 3-digit or 4-digit code found on a ceramic or film capacitor to determine its capacitance value.
Result will appear here
Enter a code to calculate
How to Read Capacitor Markings Before Calculating
Normalize the printed marking before converting a capacitor value. For the common three-digit code, the first two digits are significant figures and the third is the number of added zeros in picofarads. Thus 104 means 100,000 pF, which equals 100 nF or 0.1 µF. This rule does not cover every manufacturer code.
- Three digits: interpret the result in pF first, then convert units.
- Decimal notation: a letter may replace the decimal point, so
4R7commonly denotes 4.7 pF. - Tolerance: suffixes such as J, K, and M commonly mean ±5%, ±10%, and ±20%; do not treat them as value digits.
- Cross-check: voltage, dielectric, temperature coefficient, and vendor-specific marks require the part datasheet or series table.
