Capacitor Combination Calculator
Calculate the equivalent capacitance of two or more ideal capacitors in series and in parallel. The input list can include any number of positive capacitances in microfarads.
How to use this calculator
- Enter at least two positive capacitance values separated by commas or spaces, all expressed in microfarads.
- Check the labels and units before applying the result to a real task.
- Change one input at a time when comparing scenarios.
Formula and method
Cparallel = ΣCᵢ; 1/Cseries = Σ(1/Cᵢ)
- Cparallel = ΣCᵢ; 1/Cseries = Σ(1/Cᵢ)
- Actual capacitors have voltage ratings, tolerances, equivalent series resistance and leakage. This calculator handles ideal capacitance only.
Worked examples
Worked example
Combine capacitors of 10 µF and 20 µF.
In parallel the result is 30 µF; in series it is (1/10 + 1/20)⁻¹ = 6.667 µF.
In parallel the result is 30 µF; in series it is (1/10 + 1/20)⁻¹ = 6.667 µF.
Understanding the result
Calculate the equivalent capacitance of two or more ideal capacitors in series and in parallel. The input list can include any number of positive capacitances in microfarads.
Actual capacitors have voltage ratings, tolerances, equivalent series resistance and leakage. This calculator handles ideal capacitance only.
Important notes
Actual capacitors have voltage ratings, tolerances, equivalent series resistance and leakage. This calculator handles ideal capacitance only.
Displayed values are rounded for readability; retain appropriate precision when continuing a calculation.
Frequently asked questions
Why does parallel capacitance add?
Parallel capacitors share the same voltage and their charges add, so the equivalent capacitance is the sum of the individual capacitances.
Why is series capacitance smaller?
Series capacitors carry the same charge while voltage divides across them, which makes the reciprocal capacitances add.
Does this check capacitor voltage ratings?
No. It computes ideal equivalent capacitance only; voltage sharing and safe component selection require additional circuit analysis.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.