Time Constant Calculator Time Constant Calculator Time Constant Calculator Resistance Ω (Ohms) kΩ (Kilo-ohms) MΩ (Mega-ohms) Capacitance pF (Picofarads) nF (Nanofarads) µF (Microfarads) mF (Millifarads) F (Farads) Calculate Understanding Time Constant The time constant (τ) is a measure of the response time of an RC circuit to a step input. It represents the time it takes for the circuit to reach approximately 63.2% of its final value. Formula: τ = R × C Where: τ (tau) is the time constant in seconds R is the resistance in ohms (Ω) C is the capacitance in farads (F) Example: Let's calculate the time constant for an RC circuit with: Resistance (R) = 10 kΩ = 10,000 Ω Capacitance (C) = 100 µF = 0.0001 F Time Constant (τ) = 10,000 Ω × 0.0001 F = 1 second Subscribe to Updates Get the latest creative news from SmartMag about art & design. By signing up, you agree to the our terms and our Privacy Policy agreement.