How to Use Capacitance Calculator
The Capacitance Calculator covers five common capacitance-related calculations. Select the mode that matches your known values.
- Choose a mode — Select one of: Capacitance (C), Charge (Q), Voltage (V), Energy (E), or Parallel Plate at the top of the Capacitance Calculator.
- Enter the required inputs — The Capacitance Calculator shows only the inputs relevant to the selected mode.
- Read the result — The Capacitance Calculator instantly displays the result with automatically chosen units (e.g. μF, nF, pF).
For the parallel-plate mode, enter the permittivity of the dielectric material, the plate area in m², and the plate separation in m. The Capacitance Calculator then returns the resulting capacitance.
Formula & Theory — Capacitance Calculator
The Capacitance Calculator implements the following standard formulas:
C = Q / V (Capacitance from charge and voltage)
Q = C × V (Charge from capacitance and voltage)
V = Q / C (Voltage from charge and capacitance)
E = 0.5 × C × V² (Stored energy in joules)
C = ε × A / d (Parallel-plate capacitance)
| Symbol | Meaning |
|---|---|
| C | Capacitance (farads, F) |
| Q | Electric charge (coulombs, C) |
| V | Voltage across the capacitor (volts, V) |
| E | Stored energy (joules, J) |
| ε | Permittivity of the dielectric (F/m) |
| A | Area of one capacitor plate (m²) |
| d | Distance between the plates (m) |
Unit Conversion Reference
The Capacitance Calculator automatically scales results to a readable unit:
| Unit | Value |
|---|---|
| 1 F | 1 farad |
| 1 mF | 10⁻³ F |
| 1 μF | 10⁻⁶ F |
| 1 nF | 10⁻⁹ F |
| 1 pF | 10⁻¹² F |
Use Cases for Capacitance Calculator
The Capacitance Calculator is a versatile tool for physics, electronics, and engineering:
- Basic physics — Students use the Capacitance Calculator to solve textbook problems involving charge, voltage, and energy stored in a capacitor.
- Circuit analysis — Electronics engineers use the Capacitance Calculator to determine the charge or energy stored in decoupling and bypass capacitors at given supply voltages.
- Component selection — When designing power supplies or filter circuits, the Capacitance Calculator helps select the right capacitor value given voltage and charge requirements.
- Energy storage estimation — The Capacitance Calculator computes the energy stored in supercapacitors or capacitor banks used in energy harvesting and UPS systems.
- Parallel-plate experiments — Physics lab students use the Capacitance Calculator to verify measured capacitance against the theoretical parallel-plate formula using known plate dimensions and dielectric materials.
- Sensor design — MEMS and proximity sensor designers use the Capacitance Calculator to model how changes in plate area or gap distance affect capacitance in capacitive sensing applications.