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Engineering

Capacitor Charge Calculator

Stored charge and energy in a capacitor.

Enter your values

Enter the capacitance in µF.

Enter the voltage in V.

Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.

Results
Stored charge
12.000 mC
Stored energy
72.000 mJ
Capacitance
1000 µF

Quick answer

Charge Q = C x V; energy E = 0.5 x C x V^2.

Q = CV, E = 0.5CV^2

At a glance

What it doesStored charge and energy in a capacitor.
CategoryEngineering
Inputs neededCapacitance, Voltage
Main outputStored charge
FormulaQ = CV, E = 0.5CV^2
CostFree — no sign-up, no download

How to use the Capacitor Charge Calculator

  1. 1Enter the capacitor's rated capacitance in microfarads.
  2. 2Enter the voltage across the capacitor.
  3. 3Read the stored charge and energy.

Inputs explained

Capacitance(µF)
Enter the capacitance in µF.
Voltage(V)
Enter the voltage in V.

Worked example

Using the values the calculator loads with:

Inputs

  • Capacitance1000 µF
  • Voltage12 V

Results

  • Stored charge12.000 mC
  • Stored energy72.000 mJ
  • Capacitance1000 µF

Frequently asked questions

Why do capacitors store less energy than batteries?

Capacitors store charge on plates directly, which is far less dense than the chemical storage in batteries.

Is it safe to touch a charged capacitor?

Large capacitors can hold a dangerous charge even when disconnected — always discharge safely first.

What do I need to enter into the Capacitor Charge Calculator?

Just 2 values: capacitance, voltage. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.

How does the Capacitor Charge Calculator work out the answer?

Charge Q = C x V; energy E = 0.5 x C x V^2. It applies the formula Q = CV, E = 0.5CV^2 and shows the working so you can check each step by hand.

Is the Capacitor Charge Calculator free, and do I need an account?

It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.

Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.