How this calculator works
Enter resistance (ω), capacitance (µf), target charge (%). CalcStack applies the displayed formula and reports each intermediate planning value with the units shown.
Formula / method
t = −RC ln(1 − target fraction)
Worked example
10 kΩ and 100 µF reach 99% charge in about 4.605 seconds.
Assumptions and limitations
Supply voltage is constant and the capacitor starts discharged.
Leakage, ESR, load current, tolerance and nonlinear circuits are excluded.