Capacitor Charge Time Calculator
Calculate the RC time constant and charge/discharge curve of a capacitor through a resistor, including voltage over time, time to reach a target level, and a visual curve.
RC Parameters
Calculated Values
Voltage Curve
v(t) = Vmax × (1 − e^(−t/τ))5τ is practically considered fully charged (≈ 99.3%).
τ Milestones
| Multiple | Time | Charged |
|---|
How does this tool work?
Interactive RC calculator with charge/discharge curve, time constant τ = R·C, and time to reach any target voltage percentage.
Calculates the time constant τ = R × C, the voltage curve for charging v(t) = Vmax·(1 − e^(−t/τ)) and discharging v(t) = V0·e^(−t/τ), the time to reach a target voltage percentage, and the classic 1τ–5τ milestones (5τ ≈ 99.3% charged).
Where are my data processed?
100% Client-Side: Your data never leaves your browser.
All calculations, conversions, encodings, and file processing of this tool are executed exclusively locally via JavaScript on your client device. No inputs, passwords, cryptographic keys, texts, or uploaded files are ever sent to our servers or third parties. Once the page is loaded, the tool remains completely functional even offline.