Capacitance Value Calculator for Molded Mica

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Square Mica capacitors with colored dots to indicate value are commonly found in many pieces of vintage equipment, especially equipment based on vacuum tubes, such as radios.

This page is designed to help you determine the value of any of these mica capacitors which you may have. Simply enter the colors of the dots on your capacitor in the order in which they appear and the value of your capacitor will be calculated. Please note that the locations of the dots on your capacitor do not read left to right on 6-dot capacitors.

How many dots on your capacitor? *

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