Capacitor Formulas Calculator
Review key capacitor equations with mini tools for charge, energy, reactance, and RC time.
Inputs
Result
Example Inputs: C = 100 uF, V = 12, f = 60 Hz, R = 1k
Example Output: Q = 1.2 mC, E = 7.2 mJ, Xc approx 26.5 Ohms, tau = 0.1 s
Live Result: Enter values and click Calculate.
Formula
C = Q/V; Q = C * V; E = 1/2 * C * V^2; Xc = 1/(2*pi*f*C); tau = R * C
Worked Example
Use the example inputs and outputs above to walk through the calculation step-by-step.
FAQ
Which formula should I choose?
Select the mode that matches your task, such as charge, energy, reactance, or time constant.
What units are expected?
You can use unit selectors or engineering notation like 100uF, 1k, and 60Hz.
What is tau (τ)?
τ is the RC time constant. At one τ, a charging capacitor reaches about 63.2% of final voltage.
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View ProductFormula Notes
This content-forward calculator summarizes core capacitor equations used in electronics.
Worked Example
At 100 uF and 12V, stored energy is 7.2 mJ.