Polyester Capacitor Color Code Calculator

Select values from all select boxes and click on calculate. Result will be displayed.

What is a Polyester Capacitor Color Code Calculator?

A Polyester Capacitor Color Code Calculator is a tool used to determine the capacitance value of polyester film capacitors based on their color bands. These capacitors often use a color-coded marking system similar to resistors instead of numeric values.

Why is it Used?

Many small polyester capacitors lack space for printed values, so manufacturers use color bands to indicate:

  • Capacitance value (in picofarads, pF)
  • Tolerance
  • Voltage rating

A calculator helps quickly decode these values without manually referring to charts.

How Does it Work?

  1. Identify the number of color bands (usually 4 or 5).
  2. Enter the colors into the calculator.
  3. The calculator processes the input using standard coding rules.
  4. It outputs the capacitance in pF, nF, or µF, along with tolerance and voltage.

When is it Needed?

  • When dealing with old or unmarked capacitors.
  • During repairs and troubleshooting.
  • When component markings are unclear or partially erased.