Capacitor Charge Calculator

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Calculate charge time, voltage, and time constant for RC circuits

Resistance (Ω) Capacitance (µF) Target Voltage (%)

τ = RC Time Constant

τ = 0.100 s

Time to reach 63.2%: 0.100 s

τ (τ = RC)

0.10 s

5τ (Full Charge)

0.50 s

Target Time

0.10 s

C·R Product

0.100

About: The RC time constant τ = R × C determines how quickly a capacitor charges. After 1τ, the capacitor reaches 63.2% of full charge; after 5τ, it's essentially fully charged (99.3%). The voltage at time t is V(t) = V₀(1 - e^-t/τ).