Capacitors in Parallel Calculator

Calculate total capacitance of multiple capacitors connected in parallel. Supports pF, nF, µF, mF, F units. Real‑time interactive input.

Formula: Ctotal = C1 + C2 + ... + Cn (parallel connection)

All capacitors must have the same voltage rating in practice.

Add Capacitor
10µF + 10µF (20µF) 100µF ×3 (300µF) 4.7µF + 10µF (14.7µF) 0.1µF + 0.1µF (0.2µF) 1000µF + 1000µF (2000µF) 22pF + 22pF (44pF)
Total Capacitance
20.0 µF
Total Capacitance (Ctotal)
Calculation details
10.0 µF + 10.0 µF = 20.0 µF
Equivalent series & parallel notes
In parallel, capacitances add directly. The voltage rating of the combination equals the lowest individual voltage rating.

Understanding Capacitors in Parallel

When capacitors are connected in parallel, the total capacitance is the sum of the individual capacitances. This configuration is often used to increase the total capacitance in a circuit (e.g., for power supply filtering).

Mathematical formula: Ctotal = C1 + C2 + ... + Cn

Voltage rating: The parallel combination can withstand a voltage equal to the lowest rated capacitor in the group. Always ensure all capacitors have a voltage rating at least as high as the circuit voltage.

Unit Conversion

Unit Symbol Value in Farads
Picofarad pF 10−12 F
Nanofarad nF 10−9 F
Microfarad µF 10−6 F
Millifarad mF 10−3 F
Farad F 1 F

Practical Applications

  • Power supply filtering: Large electrolytic capacitors are paralleled to reduce ripple.
  • Energy storage: Increasing total capacitance stores more energy.
  • Timing circuits: Combining capacitors to achieve non‑standard values.
  • Decoupling: Small ceramic capacitors paralleled with bulk capacitors to filter high‑frequency noise.

⚡ Note: This calculator assumes ideal capacitors. In real life, tolerances and parasitic elements (ESR, ESL) may affect performance.

Frequently Asked Questions

Yes, it's common. For example, a large electrolytic in parallel with a small ceramic provides both bulk capacitance and high‑frequency decoupling. However, ensure voltage ratings are sufficient.

The parallel combination should not exceed the lowest voltage rating of any individual capacitor. Exceeding that can cause the lowest‑rated capacitor to fail.

This calculator handles mixed units automatically by converting everything to farads before summing, then converting the result to a human‑readable unit (µF, nF, or pF) based on magnitude.