Precision
Calculators
Professional-grade tools for capacitor design. Calculate energy storage, convert units, and optimize circuit configurations—all free, no signup required.
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Energy Storage Calculator
Calculate energy stored in a capacitor using E=½CV². Essential for power supply design, flash circuits, and energy storage applications.
Capacitor Value Calculator
Convert between capacitance units (pF, nF, µF, mF, F) instantly. Calculate series and parallel combinations with visual diagrams.
Series & Parallel Calculator
Calculate total capacitance and safe voltage ratings for capacitor banks. Includes charge balance method for series voltage division.
Cross-Reference Tool
Find equivalent capacitors from different manufacturers. Enter any part number to discover compatible alternatives.
Formula Reference
Essential equations for capacitor circuit design.
JoulesCoulombsFaradsFaradsSecondsOhmsFrequently Asked Questions
How do I calculate energy stored in a capacitor?
Use the formula E = ½CV², where E is energy in Joules, C is capacitance in Farads, and V is voltage in Volts. For example, a 1000µF capacitor charged to 50V stores E = ½ × 0.001 × 50² = 1.25 Joules.
How do I convert between pF, nF, and µF?
1 µF = 1,000 nF = 1,000,000 pF. To convert: divide by 1000 to go up (pF→nF→µF), multiply by 1000 to go down (µF→nF→pF). Our calculator handles all conversions automatically.
How do capacitors add in series vs parallel?
In parallel, capacitances add directly: C_total = C1 + C2 + C3. In series, reciprocals add: 1/C_total = 1/C1 + 1/C2 + 1/C3. Series connections reduce total capacitance but increase voltage rating.
What is the formula for capacitor discharge time?
Discharge time depends on the RC time constant: τ = R × C. A capacitor discharges to ~37% after 1τ, ~14% after 2τ, ~5% after 3τ, and ~2% after 4τ. Full discharge is typically considered 5τ.
Are these capacitor calculators free to use?
Yes, all our capacitor calculators are completely free with no registration required. Use them as many times as you need for your engineering projects.
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