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Capacitor Charge and Time Constant Calculator
The time constant is a measurement of the time needed to charge a capacitor by approximately 63.2% or discharge a capacitor by about 36.8% of the difference between the old value and the new value after an impulse that induces a change has been applied. The time constant also defines the response of the circuit to a step (or constant) voltage input. Consequently, the cutoff frequency of the circuit is defined by the time constant.
Time Constant = Voltage (V) x Capacitance (μF) x Load Resistance (Ω)
To calculate the energy (E) and time constant (RC) in a capacitor for the given voltage across it, we need two different values from the calculator:
- Energy stored on a capacitor (E) can be determined by providing all three inputs: voltage (V), capacitance (C), and load resistance (R).
- Time constant (T) can be determined from the values of capacitance (C) and load resistance (R).
All electrical or electronic circuits or systems suffer from some form of “time-delay” between their input and output when a signal or voltage, either continuous (DC) or alternating (AC), is firstly applied to it.
This delay is generally known as the time delay or time constant of the circuit, and it is the time response of the circuit when a step voltage or signal is firstly applied. The resultant time constant of any electronic circuit or system will mainly depend upon the reactive components, either capacitive or inductive, connected to it and is a measurement of the response time with units of Tau – τ.
When an increasing DC voltage is applied to a discharged capacitor, the capacitor draws a charging current and "charges up." When the voltage is reduced, the capacitor discharges in the opposite direction. Because capacitors are able to store electrical energy, they act like small batteries and can store or release the energy as required.
The charge on the plates of the capacitor is given as: Q = CV. This charging (storage) and discharging (release) of a capacitor's energy are never instant but take a certain amount of time to occur, with the time taken for the capacitor to charge or discharge to within a certain percentage of its maximum supply value being known as its time constant (τ).
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Electronic Circuits Calc Pro is your ultimate electronics toolkit — featuring over 130 calculators, circuit tools, and guides for beginners and professionals alike.
Perfect for electronics enthusiasts, students, hobbyists, and engineers alike, Electronic Circuits Calculator Pro is a powerful reference tool covering essential electronics concepts, components, and circuit design. Whether you're just getting started or need a quick calculation on the go, this app has you covered.
Key Features:
• Multilingual support: English, French, German, Indonesian, Italian, Polish, Portuguese, Russian, Spanish, Turkish, and Ukrainian
• Full-text search for instant access to any topic
• Designed for both light & dark modes
Categories Included:
Basic calculators
• Ohm's Law
• Power, voltage and current
• Resistive voltage divider
• Wheatstone Bridge
• RC circuit time constant
• Battery Life
• Additional resistor for voltmeter
• Shunt resistor for ammeter
Resistors
• Resistor color codes
• SMD resistor codes
• EIA-96 Encoding
• Standard values finder for resistor
• Series resistors
• Parallel resistors
• E series
Capacitors
• Ceramic disc capacitors codes
• Film capacitors codes
• Capacitor working voltage codes
• Film capacitors colour codes
• SMD Tantalum electrolytic capacitors codes
• Series capacitors
• Parallel capacitors
Inductors
• Inductor color codes
• SMD inductors codes
• Series inductors
Diodes
• Diodes
• Rectifier diodes
• Signal diodes
• Schottky diode
• Tunnel diode
• Varicap
• Zener diode
Transistors
• Bipolar transistors
• Metal-Oxide-Semiconductor Field-Effect Transistor
• Junction Field-Effect Transistor
• Unijunction transistor
• Insulated gate bipolar transistor
• Darlington transistor pair
Thyristors
• Thyristors
• Gate Turn-Off Thyristor
• TRIAC
• DIAC
• IGCT thyristor
• MOS-Controlled Thyristor
• Programmable unijunction transistor
PowerSupplies
• AC parameters and rectified value
• Half-wave rectifier
• Full-wave rectifier
• Bridge rectifier
• Capacitive power supply
• Power source internal resistance
• Symmetrical voltage doubling rectifier circuit
• Three-Phase Half-Wave Rectifier
• Three-phase bridge rectifier
• Voltage multiplier
Voltage and current regulators
• LM317 Voltage regulator calculator
• Bipolar voltage regulator for LM317 and LM337
• LM317 Current Source calculator
• Zener reference voltage source
• Thermally compensated voltage reference
• Calculation of the stabilizer on TL431
• The TL431 stabilizer with additional transistor
LED
• Introduction of LEDs
• LED Single Resistor calculator
• LED Series Resistor calculator
• LED Parallel Resistor calculator
• 7-segment LED display
• Decoder (driver) for 7-segment displays CD4511
Photocells
• Photodiode
• Photoresistor
• Phototransistor
• Optocoupler
OP
• Non-Inverting OP Amplifer Gain calculator
• Inverting OP Amplifier Gain calculator
• Inverting amplifier with T-bridge in feedback
• Inverting summing OP Amplifier
• Differential OP amplifier
• OP Voltage integrator
• OP Voltage Differentiator
• OP Voltage comparator
Frequency
• Capacitor reactance
• Reactance of an inductance coil
• Gain conversion to decibels
• dBm to Watts conversion
• T-Attenuator
• Pi-Attenuator
• L-Attenuator
• Bridged T-Attenuator
• Capacitive AC Voltage Divider
• Inductive Voltage Divider
• Frequency and wavelengths
Filters
• RC Low Pass Filter
• RC High Pass Filter
• RC Band pass filter
• RL low-pass filter
• RL high-pass filter
• LC Low Pass Filter
• LC High Pass Filter
Timers
• Astable multivibrator
• Monostable (waiting) multivibrator
• Bistable multivibrator
• Multivibrator with additional diodes
• NE555 Astable Multivibrator
• NE555 Monostable Multivibrator
Logic gates:
- AND. OR, NOT, NAND, NOR, XOR, XNOR
The application is being actively developed and supplemented with new calculators. Keep for updates!
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January 18, 2026