A camera flash is a capacitor showing off. It sips charge from the battery for a few seconds, stores it, then dumps everything in a millisecond — a burst far brighter than the battery alone could ever produce. The charge sitting on a capacitor follows one clean rule: charge equals capacitance times voltage. In symbols: Q = C × V. Double the voltage and you double the stored charge; double the capacitance and you double it again.

This is the same math inside a defibrillator's charging cycle and the power supply of every desktop computer. It also explains capacitor safety ratings: a capacitor charged to 300 volts holds far more punch than its size suggests, which is why technicians short them with a resistor before handling.

This calculator works all three directions. Pick what to solve for in the Calculate dropdown — charge, capacitance, or voltage. Type the two values you know: capacitance in farads in the Capacitance (C) box and voltage in volts in the Voltage (V) box, or charge in coulombs in the Charge (Q) box. The Computed Value box shows the answer instantly, so you can check a flash circuit's stored charge or verify a replacement capacitor's rating before you buy.

With the pre-filled defaults — Calculate Charge (Q = C * V), Charge (Q) 0.0012 C (Coulombs), Capacitance (C) 0.0001 F (Farads), Voltage (V) 12 V — the Capacitor Charge Calculator returns Computed Value 0.001200. Change any input and those results update instantly, so you can see exactly how each number you enter moves the answer.