What you provide
What you provide
- Resistance expressed in ohm, using the same scenario as the other inputs
- Capacitance expressed in uF, using the same scenario as the other inputs
PHYSICS / CIRCUITS
RC Time Constant Calculator
Calculate the characteristic charging or discharging time of a first-order RC circuit. Inspect the governing equation, substituted SI values, output, and model boundaries in one guided workspace.
- 01 Calculated in this tab
- 02 Values stay in this browser tab
- 03 Use boundary
Use boundary
Calculation path
Calculate the characteristic charging or discharging time of a first-order RC circuit. The page evaluates the displayed equation from your supplied values and presents both symbolic and substituted KaTeX working so the arithmetic can be checked.
Calculation path
tau = RC
What you receive
What you receive
- Time constant in s from the stated equation
- A symbolic formula plus substituted working with your values
- Visible assumptions, field guidance, and an authoritative learning reference
Use boundary
Choose the maximum decimal places shown. This does not increase source accuracy.
Resistance and capacitance are ideal and constant, with no source or leakage impedance.
Use internally consistent units and retain extra precision when carrying the result into another calculation.
Reviewed reference factors