June 9, 2026 RC Circuit Calculator Time Constant Transient Impedance Quick Presets -- Custom -- 1 kΩ, 1 µF 10 kΩ, 0.1 µF 47 kΩ, 0.1 µF 100 kΩ, 10 nF Resistance (R) Ω kΩ MΩ Capacitance (C) pF nF µF mF F Mode Charging (Vc rises to Vs) Discharging (Vc falls from V₀) Source Voltage (Vs) V Initial Voltage (V₀) V Resistance (R) Ω kΩ MΩ Capacitance (C) pF nF µF mF F Time (t) s ms µs Quick Presets -- Custom -- 1 kΩ, 1 µF, 1 kHz 10 kΩ, 0.1 µF, 10 kHz 1 kΩ, 0.1 µF, ~1592 Hz (fc) Configuration Series RC Parallel RC Frequency (f) Hz kHz MHz Resistance (R) Ω kΩ MΩ Capacitance (C) pF nF µF mF F Calculate Reset Copy Results Export PDF Copied! Results