Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Supply voltage (V)

Required number input.

Resistance (ohm)

Required number input.

Capacitance (F)

Required number input.

Time (s)

Required number input.

Compute the charging voltage across an RC network after a given elapsed time. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Capacitor voltage (V)

The resulting capacitor voltage returned as a number.

• Capacitance, ESR, leakage, ripple rating, lifetime, and self-resonance vary with frequency, temperature, DC bias, aging, dielectric, package, and mounting. Nominal capacitance alone does not determine in-circuit impedance or reliability.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• RC Discharging Voltage

  Compute the remaining voltage across a discharging RC network after a given elapsed time.

• RC Time To Threshold

  Calculate RC charging time to a target voltage.

• Holdup Cap Value

  Compute the capacitance required to hold up a load from the input voltage down to a minimum voltage for a given time at constant power.