Capacitor Charge Calculator
Capacitor Charge
Calculate RC circuit charge time to a target level.
Formula
Time = -R x C x ln(1 - target%)
Frequently Asked Questions
What is a time constant?
Tau = R x C. It is the time to reach 63.2% charge.
How long to fully charge a capacitor?
About 5 time constants to reach 99.3% of full charge.