Capacitance and inductance
Capacitors in parallel
- where
- total capacitance (F)
- individual capacitances (F)
Explain this equation
Works out the total capacitance of capacitors connected across the same two points. Used when combining capacitors to reach a value.
Cₜ is the total capacitance. C₁, C₂ and C₃ are the individual capacitances, all with the same voltage across them.
Parallel capacitors act like one bigger set of plates. Each holds its own charge at the shared voltage, so the capacitances add.
Sense check: 100 + 200 + 300 µF gives 600 µF. The total is always bigger than any single capacitor.
Watch out: this is the opposite of resistors. And the lowest voltage rating among them sets the safe working voltage.
Capacitors in parallel share voltage and their charge capacities add. Sum their capacitances using one consistent unit.
Unlike parallel resistors, parallel capacitors increase the total capacitance. Component voltage ratings still matter.
Enter your values to see the result.
Common mistake
Applying the parallel-resistance reciprocal rule.
Limits
Ideal capacitors across the same two nodes.
Sources
The tools calculate the displayed equation. They do not automatically choose cable sizes, approve installations, supply current regulatory tables, certify equipment or replace inspection and testing.