// multi-utility computation suite · offline · instant · precise
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│ computation suite │
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eng.capacitor-charge-time Calculator
Calculates the time for a capacitor to charge to a percentage of supply voltage from RC time constant and target voltage ratio. The RC time constant τ = RC defines the characteristic charging timescale — the capacitor reaches 63.2% of supply voltage after one time constant.
Inputs
Capacitance Uf
Ability to store electric charge (F). Capacitors charge quickly and release energy fast. Common values: pF to μF.
Resistance Ohm
Opposition to current flow (Ω). V = IR. Resistors in series add; in parallel their reciprocals add.
Target Pct
Reference formula or conversion factor shown for context.
Results
time to reach
The computed duration or time value.
time constant τ = RC (s)
Time for the capacitor (or inductor) to reach 63.2% of its final value. τ = RC. After 5 time constants (~99.3%), the circuit is effectively at steady state.
time to full charge (~99.3%)
The computed duration or time value.
t = -RC × ln(1 - pct)
Sample size or count used in the calculation.
1τ = 63.2%, 2τ = 86.5%, 5τ = 99.3%
Reference formula or conversion factor shown for context.