Electronics Calculators
Calculate circuit values, op-amp gains, filter response, and 555 timer timings, or decode component markings. Select a calculator below.
Calculators
17 CALCULATORS
Voltage Divider Calculator
Calculate output voltage, find resistor values, and check the effect of a connected load.
Ohm’s Law Calculator
Enter any two known values to solve voltage, current, resistance, and power.
Parallel Resistors Calculator
Find equivalent resistance, total current, and individual branch currents.
Inverting Op-Amp Calculator
Solve output voltage, input voltage, gain, or either resistor in an inverting amplifier.
Non-Inverting Op-Amp Calculator
Find output voltage, input voltage, gain, feedback resistance, or ground resistance.
Difference Amplifier Calculator
Analyze a four-resistor subtractor and solve either input, the output, or any resistor.
SMD Resistor Code Calculator
Decode 3-digit, 4-digit, R-decimal, and EIA-96 resistor markings into ohms, kΩ, and MΩ.
SMD Capacitor Code Calculator
Decode capacitor markings into pF, nF, and µF, with numeric, R-decimal, and EIA-198 codes.
Resistor Color Code Calculator
Read 4, 5, and 6-band resistor colors, resistance, tolerance range, and temperature coefficient.
RLC Circuit Calculator
Analyze series or parallel RLC resonance, impedance, phase, Q factor, and AC current.
Series Capacitors Calculator
Calculate series capacitance, ideal voltage division, charge, and stored energy.
Parallel Capacitors Calculator
Add parallel capacitances and calculate charge and stored energy at a chosen voltage.
RC Passive Filter Calculator
Design a low-pass or high-pass RC filter and inspect its gain and phase response.
RL Passive Filter Calculator
Design a low-pass or high-pass RL filter and inspect its gain and phase response.
Series Resistors Calculator
Add series resistances and calculate circuit current, voltage drops, and power.
555 Astable Timer Calculator
Find frequency, duty cycle, and high and low times for a standard 555 oscillator.
555 Monostable Timer Calculator
Calculate one-shot pulse duration, or find a timing resistor or capacitor.
App downloads
Electronics Tools & Calculator is available for iOS, Android, and Windows.
Screenshots and app details →
How these calculators work
Formulas and examples
Each calculator includes its equations, input instructions, and a worked example.
Units and assumptions
Select units for numerical inputs. Refer to the notes on each page for circuit assumptions and supported code formats.
Inputs and share links
Calculations run in your browser. A share link includes your selected input values.