How do capacitors add in parallel?

Capacitors in parallel add directly: Ctotal = C1 + C2 + C3.

How do capacitors add in series?

For capacitors in series, reciprocal capacitance adds: 1/Ctotal = 1/C1 + 1/C2 + 1/C3.

Does voltage rating increase in series?

In theory, series capacitors can increase voltage rating, but real designs need balancing resistors because leakage differences can cause uneven voltage sharing.

Capacitor Series and Parallel Calculator

Calculate equivalent capacitance for capacitors in series or parallel, plus voltage rating, charge, stored energy and practical voltage-sharing notes.

⚡ Key Insight: Capacitors behave opposite to resistors. In parallel, capacitance adds directly. In series, equivalent capacitance becomes smaller and voltage sharing can become important.

🔋 Capacitors in Series vs Parallel

Applied Voltage Optional

Balancing Resistor Note

Result

Presets:3 × 10µF100µF + 220µFHV stack

Applied Voltage Optional

Voltage Rating Rule

Result

Presets:10+22+47µFbulk capsdecoupling

Single Capacitor Value

Single Capacitor Voltage

Series Count

Parallel Strings

Applied Voltage Optional

Topology

Presets:2 in series2S3P bank4 parallel

📐 Formula Reference

Parallel Capacitors

Ceq = C1 + C2 + C3 + ...
Voltage rating = lowest rating
Q = C × V

Series Capacitors

1/Ceq = 1/C1 + 1/C2 + ...
Equal capacitors: Ceq = C / N
Voltage divides inversely with capacitance

Stored Energy

E = 1/2 × C × V²
Use C in farads
Result in joules

Capacitor Bank

Cbank = Csingle × Parallel / Series
Vrating ≈ Vsingle × Series
Use balancing resistors in HV series banks

📋 Quick Reference

🔵 Unit Conversion

1 F1000 mF

1 mF1000 µF

1 µF1000 nF

1 nF1000 pF

🟢 Parallel Use

Increase capacitanceyes

Voltage ratinglowest cap

Common usefiltering

🟠 Series Use

Increase voltagepossible

Capacitancedecreases

HV designbalance needed

📚 Engineering Notes

Parallel capacitors increase capacitanceParallel connection is used when you need more total capacitance, lower impedance, or better decoupling across a wider frequency range.

Series capacitors need voltage balancingIn theory, voltage rating adds in series. In real circuits, leakage current differences can cause uneven voltage distribution, so balancing resistors are often used.

Energy can become dangerousLarge capacitor banks can store enough energy to shock, spark, or damage components. Discharge safely before touching circuits.

ESR and ripple current matterThis calculator handles ideal capacitance. For power supplies, also check ESR, ripple current rating, temperature and lifetime from the datasheet. For matching passive-network workflows, compare this page with the resistor series/parallel calculator and the upcoming inductor series/parallel calculator.

What is a Capacitor Series and Parallel Calculator?

A capacitor series and parallel calculator finds the equivalent capacitance of multiple capacitors connected in series, parallel, or a mixed capacitor bank. It is useful for electronics repair, power supply filtering, timing circuits, decoupling networks and capacitor bank design.

When should capacitors be connected in series or parallel?

Use parallel capacitors when you want to increase capacitance. Use series capacitors when you need a higher voltage rating, but remember that capacitance decreases and voltage sharing must be considered. For related work, use the Reactance Calculator, RC & RL Filter Calculator, Capacitor Code Calculator and Power Dissipation Calculator. If you are comparing passive networks, the Resistor Series and Parallel Calculator is useful for resistance equivalents, and the upcoming Inductor Series and Parallel Calculator will cover equivalent inductance in the same style.

❓ Frequently Asked Questions

No. Capacitors in series use the reciprocal formula, so the equivalent capacitance becomes smaller than the smallest capacitor.

Yes. Parallel capacitors add directly, so 10 µF + 22 µF + 47 µF = 79 µF.

Theoretically yes, but in real high-voltage designs you should use balancing resistors because leakage current differences can make voltage sharing uneven.