Overview
What Is a Capacitor Calculator?
This tool calculates a capacitor's stored charge and energy based on its capacitance and applied voltage.
Calculate capacitance, charge, and energy.
This tool calculates a capacitor's stored charge and energy based on its capacitance and applied voltage.
Useful for circuit design and understanding capacitor behavior in electronics coursework.
Input the capacitor's rated capacitance in microfarads.
Input the applied voltage.
Both results update automatically.
Q = C × V, where Q is charge in Coulombs, C is capacitance in Farads, and V is voltage.
E = ½ × C × V², where E is energy in Joules.
Capacitance in microfarads (µF), voltage in Volts, charge in microCoulombs, and energy in Joules.
Because energy storage in a capacitor increases quadratically with the voltage across it, unlike charge which scales linearly.
No, calculations happen entirely in your browser.
Circuit design, power supply filtering, and energy storage applications all use these fundamental capacitor relationships.
The SI unit of capacitance - practical capacitors are often measured in much smaller units like microfarads or picofarads.
Yes, in real-world capacitors temperature can slightly affect actual capacitance, though this calculator uses the rated ideal value.
Yes, understanding charge and energy storage is fundamental to capacitor selection in power supply circuits.
Yes, completely free with no sign-up required.