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Capacitor Charging Voltage Calculator

Find capacitor voltage after an ideal DC charging step.

Ideal component relationshipsUnits and assumptions explained below

Circuit parameters

Runs on your device

CIRCUIT RESULT

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter voltage, resistance, capacitance, elapsed time.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Capacitor voltage = supply × [1 − exp(−time/(RC))].

A WORKED EXAMPLE

Using voltage = 12 V, resistance = 100 Ω, capacitance = 0.0001 F, elapsed time = 0.01 s, the result is 7.58544671 V. Change these example inputs to match your task; use the method above to check each step.

What to keep in mind

Capacitor starts uncharged; resistance and capacitance are constant. Ideal-component calculation for study and estimation. It does not select safe wiring, protective devices or component ratings for an installation.

Common questions

Which inputs does this calculation need?

Find capacitor voltage after an ideal DC charging step. Enter voltage in V, resistance in Ω, capacitance in F, elapsed time in s. The filled example is editable and is not a saved personal record.

How should I interpret the result?

Capacitor starts uncharged; resistance and capacitance are constant. Ideal-component calculation for study and estimation. It does not select safe wiring, protective devices or component ratings for an installation.

Methodology maintained by ClarityKit. How these tools are built and checked.