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.

Initial (V) (V)

Required number input.

Elapsed (s) (s)

Required number input.

Leakage Resistance (Ω) (Ω)

Required number input.

Capacitance (F) (F)

Required number input.

Estimate supercapacitor voltage after time through a constant parallel leakage resistance using V(t)=V0e^(−t/RC). 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]

Voltage (V) (V)

The resulting voltage (v) returned as a number.

• Supercapacitor energy and self-discharge models depend on capacitance tolerance, ESR, leakage that changes with voltage and time, balancing, temperature, aging, and safe cell voltage. A single RC model may poorly represent long-duration behavior.
• 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.

• Supercapacitor RC Time Constant

  Calculate τ=RC for a supercapacitor and a series or load resistance. This ideal first-order time constant does not model voltage-dependent capacitance or leakage.

• Supercapacitor Leakage Current

  Estimate steady leakage current from an equivalent parallel leakage resistance using I=V/R. Real supercapacitor leakage can depend on voltage, temperature, and settling time.

• RC Charging Voltage

  Compute the charging voltage across an RC network after a given elapsed time.