Case 1
- Capacitance
- 0.001F
- Voltage
- 12V
0.012000C
Open with these valuesCapacitor Charge Calculator
0.012000C
Result: 0.012000 CCharge is capacitance times voltage: a 1000 µF capacitor at 12 V holds 0.012 C. Double the voltage and it holds twice the charge — but four times the energy, because energy goes with the square.
The numbers at a glance
Held fixed: Capacitance 0.001000000 F.
| Voltage (V) | Result (C) |
|---|---|
| 0.00 | 0.000000 |
| 5.00 | 0.005000 |
| 10.00 | 0.010000 |
| 12.00Your value | 0.012000 |
| 15.00 | 0.015000 |
| 20.00 | 0.020000 |
Worked examples
Case 2
- Capacitance
- 0.0001F
- Voltage
- 10V
0.001000C
Open with these valuesCase 3
- Capacitance
- 0.000001F
- Voltage
- 5V
0.000005C
Open with these valuesHow it's calculated
Q = C × V
- StepEnter the capacitance in farads — 1000 µF is 0.001.
- StepEnter the voltage across the capacitor's terminals.
- ResultMultiply; the result is the stored charge in coulombs.
Reference table
| Capacitance, voltage | What that is | Charge |
|---|---|---|
| 0.000001, 5 | 1 µF on a 5 V rail | 0.000005 |
| 0.0001, 10 | 100 µF at 10 V | 0.001 |
| 0.01, 1 | A 10 mF supercap at 1 V | 0.01 |
| 0.001, 12 | 1000 µF on a 12 V supply | 0.012 |
Questions
How much charge does a capacitor hold?
Its capacitance in farads times the voltage across it, giving coulombs. A 1000 µF capacitor at 12 V holds 0.012 C.
How much energy is that?
Energy is half the capacitance times the voltage squared, so the same part holds 0.072 J. Note that doubling the voltage doubles the charge but quadruples the energy.
What happens at zero volts?
The charge is exactly zero. A capacitor with no voltage across it stores nothing, however large its capacitance.
Can I exceed the printed voltage rating?
No. The rating is a limit on the dielectric, not a suggestion, and an electrolytic that is pushed past it can vent or fail short. Stay well below it, especially where ripple or transients are present.
Sources and last check
Information, not professional advice.