Enter a capacitance and a voltage to find the exact charge stored, using Q = C × V.
How to Use the Capacitance to Charge Conversion Calculator
Enter a capacitance value (with a µF/nF/pF unit dropdown) and a voltage. The stored charge appears immediately, auto-scaled to whichever unit — nanocoulombs up to full coulombs — actually fits the number.
This is the single-direction version of the Capacitance Calculator elsewhere on this site: that one lets you solve for any of charge, capacitance, or voltage depending on which two you already know, while this one only ever answers one question — given a capacitor's value and the voltage across it, how much charge is it holding? The math is the same formula, just locked to one direction:
Q = C × VCharge in coulombs equals capacitance in farads times voltage in volts — the entire calculation, no rearrangement involved. A 100 µF capacitor charged to 12V is holding 1.2 millicoulombs, a number nobody would want to write out in full coulombs (0.0012 C) or track through by hand every time a spec sheet needs checking.
Reach for this version specifically when capacitance and voltage are both already known quantities — reading a capacitor's printed value off its case and a supply rail voltage off a schematic, for instance — and charge is the only unknown. Need to instead solve backward from a target charge, or find whichever of the three values is actually missing? The Capacitance Calculator handles that broader case.