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Free capacitor calculator. Calculate capacitance, charge, energy, and electrical properties of capacitors with step-by-step solutions. Our calculator uses electrical engineering principles to determine all capacitor parameters from any given inputs.
Last updated: February 2, 2026
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100.00 μF
1.000e-4 F
1200.00 μC
1.200e-3 C
7.20 mJ
7.200e-3 J
12 V
0.00 mA
0.00 ms
1.59 Ω
Charge Formula
Q = C × V
Energy Formula
E = ½ × C × V²
Time Constant
τ = R × C
Capacitive Reactance
Xc = 1 / (2πfC)
Formulas used
Q = C × V, E = ½ × C × V²
Calculates charge and energy from capacitance and voltage
Formula used
Q = C × V
Direct relationship between charge, capacitance, and voltage
Formula used
E = ½ × C × V²
Calculates energy storage from capacitance and voltage
Formula used
τ = R × C
Calculates time constant for RC circuit analysis
Formula used
Xc = 1 / (2πfC)
Calculates capacitive reactance for AC analysis
Features
DC & AC Analysis
Comprehensive electronic circuit calculations
For capacitance = 100 μF, voltage = 12 V:
Charge
1.2 mC
Energy
7.2 mJ
Reactance
1.59 kΩ
Our capacitor calculator uses the fundamental principles of electrical engineering to calculate all capacitor parameters from any given inputs. The calculation applies electrical formulas and circuit analysis to determine charge, energy, reactance, and time constants.
Q = C × VE = ½ × C × V²Xc = 1 / (2πfC)τ = R × CThese formulas form the foundation of capacitor analysis and allow calculation of all electrical properties from any combination of known values. They apply to both DC and AC circuit analysis.
Shows the relationships between charge, voltage, energy, and reactance
Capacitors are fundamental components in electrical circuits that store energy in electric fields. They exhibit unique behavior in DC and AC circuits, making them essential for filtering, timing, and energy storage applications in electronic systems.
Need help with other electrical calculations? Check out our circuit calculator and power calculator.
Get Custom Calculator for Your PlatformResult: Charge = 1.2 mC, Energy = 7.2 mJ, Reactance = 1.59 Ω
The capacitor stores 1.2 millicoulombs of charge and 7.2 millijoules of energy.
100 μF capacitor with 1 kΩ resistor
Time constant τ = 100 ms
100 μF capacitor at 1 MHz
Reactance Xc = 1.59 mΩ
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