Capacitor Charge Time Calculator
Estimate RC charge and discharge voltage over time using the time constant model.
Inputs
Result
Example Inputs: R = 1k, C = 100uF, Vs = 5V, t = 0.1s
Example Output: tau = 0.1s, Vc(charge) ≈ 3.16V
Live Result: Enter values and click Calculate.
Formula
tau = R * C; charge Vc = Vs * (1 - e^(-t/tau)); discharge Vc = V0 * e^(-t/tau)
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
At one time constant, a charging capacitor reaches about 63.2% of final voltage.
Worked Example
For tau = 0.1s and Vs = 5V, charge voltage at t=0.1s is approximately 3.16V.