CIRCUITSIM CALCULATORS
Calculate. Explore. Simulate.
Useful answers, with a circuit you can see and understand.
60 calculators
Basics & resistor networks
Voltage divider
Calculate output voltage, divider current and resistor power. Explore the schematic and try the circuit in CircuitSim.
Open calculator →Filters & frequency response
RC low-pass filter
Find cutoff frequency, gain and phase for a resistor-capacitor low-pass filter. Explore its frequency response and try the circuit in CircuitSim.
Open calculator →Filters & frequency response
RC band-pass filter
Calculate center frequency, bandwidth and gain for a passive RC band-pass filter. Explore both stage corners and the combined response.
Open calculator →Basics & resistor networks
Ohm’s law & power
Enter any two known values to calculate voltage, current, resistance and power. Explore the real circuit and try it in CircuitSim.
Open calculator →Basics & resistor networks
Series resistance
Calculate the total resistance of two to four series resistors, plus current, voltage drops and power. Edit the real schematic and try it in CircuitSim.
Open calculator →Basics & resistor networks
Parallel resistance
Calculate equivalent resistance for two to four parallel resistors. See branch currents and power, edit the live circuit and explore it in CircuitSim.
Open calculator →Basics & resistor networks
Current divider
Calculate how a total current splits between two parallel resistors. See branch currents, voltage and power with a live circuit and worked equations.
Open calculator →Diodes & LEDs
LED series resistor
Size an LED current-limiting resistor from supply voltage, forward voltage and current. Find an E24 value, actual LED current and resistor power.
Open calculator →Capacitors & timing
Series capacitance
Calculate equivalent capacitance and voltage sharing for two to four series capacitors. Edit the schematic, follow the worked math and try the circuit.
Open calculator →Capacitors & timing
Parallel capacitance
Calculate total capacitance and AC current sharing for two to four parallel capacitors. Edit a live schematic and try your circuit in CircuitSim.
Open calculator →Capacitors & timing
Capacitive reactance
Calculate capacitor reactance, impedance and AC current at any frequency. Edit a live schematic and try your circuit in CircuitSim.
Open calculator →Filters & frequency response
Inductive reactance
Calculate inductor reactance, impedance and voltage at any frequency. Edit a live schematic and try your circuit in CircuitSim.
Open calculator →Capacitors & timing
RC charge & discharge
Calculate the RC time constant and explore capacitor voltage and current during charging or discharging. Edit a live schematic and try your circuit in CircuitSim.
Open calculator →Filters & frequency response
RC high-pass filter
Calculate RC high-pass cutoff frequency, gain and phase, with an interactive frequency-response chart. Edit a live schematic and try your circuit in CircuitSim.
Open calculator →Filters & frequency response
RL low-pass filter
Calculate RL low-pass cutoff, voltage gain and phase across the resistor. Edit a live schematic and try your circuit in CircuitSim.
Open calculator →Filters & frequency response
RL high-pass filter
Calculate RL high-pass cutoff, voltage gain and phase across the inductor. Edit a live schematic and try your circuit in CircuitSim.
Open calculator →Filters & frequency response
Series RLC resonance
Find series RLC resonant frequency, Q, bandwidth, impedance and current. Edit a live schematic and try your circuit in CircuitSim.
Open calculator →Filters & frequency response
Parallel RLC resonance
Find parallel RLC resonant frequency, Q, bandwidth, input impedance and current. Edit a live schematic and try your circuit in CircuitSim.
Open calculator →Amplifiers
Inverting amplifier
Calculate inverting op-amp gain, output voltage and available supply headroom. Edit a live schematic and try your circuit in CircuitSim.
Open calculator →Amplifiers
Non-inverting amplifier
Calculate positive op-amp gain, output voltage and supply headroom from the feedback resistors.
Open calculator →Amplifiers
Voltage follower
Explore unity-gain buffering and compare loaded output with and without an op amp.
Open calculator →Amplifiers
Summing amplifier
Calculate a two-input inverting summer, including each weighted contribution and the total output.
Open calculator →Capacitors & timing
555 astable timer
Calculate 555 oscillator frequency, duty cycle and high/low times with a timing waveform.
Open calculator →Capacitors & timing
555 monostable timer
Calculate a 555 one-shot pulse width and see how a short active-low trigger starts the timing cycle.
Open calculator →Diodes & LEDs
Zener regulator
Calculate Zener output, load and diode currents, dropout and resistor dissipation.
Open calculator →Basics & resistor networks
Wheatstone bridge
Calculate bridge output, arm voltages and the resistance required for balance.
Open calculator →Basics & resistor networks
Delta to wye
Convert a three-resistor delta network to its equivalent wye and compare terminal resistances.
Open calculator →Basics & resistor networks
Loaded potentiometer
Calculate potentiometer output, loading error and output resistance at any wiper position.
Open calculator →Amplifiers
Difference amplifier
Calculate differential output, resistor-ratio mismatch and common-mode gain.
Open calculator →Basics & resistor networks
Preferred resistor combinations
Find two E24 series resistors close to a target resistance and compare practical alternatives.
Open calculator →Basics & resistor networks
Pull-up & pull-down
Compare released logic-input rise and fall times, leakage margins and resistor current.
Open calculator →Filters & frequency response
Sallen–Key low-pass
Calculate a second-order active low-pass response, natural frequency and Q.
Open calculator →Filters & frequency response
Sallen–Key high-pass
Calculate a second-order active high-pass response, natural frequency and Q.
Open calculator →Filters & frequency response
Multiple-feedback band-pass
Calculate center frequency, bandwidth and peak gain of an inverting MFB band-pass filter.
Open calculator →Filters & frequency response
Twin-T notch
Find the notch frequency and response of a balanced passive twin-T filter.
Open calculator →Filters & frequency response
RC shelving
Calculate a passive high-frequency shelf, its gain levels, pole and zero.
Open calculator →Filters & frequency response
Buffered RC band-pass
Calculate a buffered RC high-pass and low-pass cascade without interstage loading.
Open calculator →Amplifiers
Instrumentation amplifier
Calculate three-op-amp instrumentation gain, output and first-stage headroom.
Open calculator →Amplifiers
Transimpedance amplifier
Convert sensor current to voltage and estimate feedback-capacitor bandwidth.
Open calculator →Amplifiers
Practical integrator
Explore a leaky op-amp integrator, its transition frequency and AC gain.
Open calculator →Amplifiers
Practical differentiator
Explore an op-amp differentiator with input and feedback bandwidth limits.
Open calculator →Amplifiers
Schmitt trigger
Calculate inverting Schmitt-trigger thresholds and visualize switching hysteresis.
Open calculator →Diodes & LEDs
Half-wave rectifier
Calculate half-wave average and RMS output, peak current and load power.
Open calculator →Diodes & LEDs
Bridge rectifier
Calculate full-wave bridge output, ripple frequency and diode/load currents.
Open calculator →Power supplies
Reservoir capacitor ripple
Estimate full-wave smoothing ripple, average DC voltage and load current.
Open calculator →Power supplies
Linear regulator dissipation
Estimate LM317 output, regulator heat, load current and efficiency.
Open calculator →Power supplies
Buck converter
Calculate ideal buck output, inductor ripple and capacitor ripple for a fixed-duty power stage.
Open calculator →Power supplies
Boost converter
Calculate ideal boost output, inductor peak current and output ripple.
Open calculator →Power supplies
Inverting buck–boost
Calculate negative output voltage, current stress and ripple for an inverting power stage.
Open calculator →Transistors & switching
Flyback clamp
Estimate stored coil energy, switch voltage and current decay with a diode–Zener flyback clamp.
Open calculator →Transistors & switching
Common-emitter bias
Find the DC operating point and voltage headroom of a divider-biased NPN amplifier.
Open calculator →Transistors & switching
BJT switch
Check base drive, forced beta and estimated dissipation for a low-side NPN switch.
Open calculator →Transistors & switching
Low-side MOSFET switch
Estimate drain voltage, load current and on-state loss for a generic N-channel MOSFET.
Open calculator →Transistors & switching
Current mirror
Estimate the output current and compliance of a two-transistor NPN current mirror.
Open calculator →Timing & oscillators
555 PWM
Set a 555 oscillator’s frequency and duty cycle with separate charge and discharge resistors.
Open calculator →Timing & oscillators
RC debounce
Check how an RC input filter attenuates a short contact-bounce pulse.
Open calculator →Timing & oscillators
Wien bridge oscillator
Choose a Wien bridge oscillator’s frequency and check its startup gain.
Open calculator →Sensors & interfaces
ADC input settling
Estimate the remaining voltage error when an ADC sampling capacitor enters hold.
Open calculator →Sensors & interfaces
NTC divider
Calculate a thermistor divider’s voltage, sensitivity and self-heating power versus temperature.
Open calculator →Sensors & interfaces
RTD bridge
Calculate a platinum RTD bridge’s differential voltage and temperature sensitivity.
Open calculator →