Electrical & Electronics
Choose a calculator for power, components, timing, op-amps or transistors.
31 tools
Basics & Power
4–20 mA Signal Scaling Calculator
Convert loop current to engineering units or calculate current from a measured value.
Ah · Wh · h
Battery Runtime Calculator
Estimate battery life from Ah or Wh, device loads, reserve charge and conversion efficiency.
dB · dBm · W
dB, dBm & Watts Converter
Convert power and RMS voltage levels, or calculate gain and loss ratios.
V · AWG · mm²
DC Voltage Drop Calculator
Calculate cable voltage drop, load voltage and power loss with copper or aluminium, AWG or mm².
W · kWh
Electricity Cost & kWh Calculator
Estimate energy use and electricity costs for multiple appliances, including operating schedules and standby power.
V · A · Ω · W
Ohm’s Law & DC Power Calculator
Calculate voltage, current, resistance and power from two known values, with a live circuit diagram.
PoE · W · PSE
PoE Power Budget Calculator
Plan switch power and port capacity for PoE devices, with reserve and per-port checks.
W · A · kVA
Watts to Amps & AC Power Calculator
Convert watts, amps and VA for single-phase or balanced three-phase AC with power factor.
Components & Timing
555 Timer Calculator
Calculate 555 oscillator timing and one-shot pulse width, or choose standard resistors for a target frequency or pulse.
DC/DC · µH · µF
Buck & Boost Converter Calculator
Size or check a buck or boost converter inductor, estimate current and output ripple, and compare capacitor and power requirements.
LED · Ω · W
LED Resistor Calculator
Find a standard resistor for one LED or a series string, with estimated current and power dissipation.
LDO · V · W
Linear Regulator & LDO Calculator
Estimate linear-regulator power loss, efficiency, dropout margin, junction temperature and load limits.
PCB · mm · A
PCB Trace Width & Current Capacity Calculator
Estimate PCB trace width or current capacity, with copper thickness, resistance, voltage drop and power loss.
RC · s · Hz
RC Timing & Filter Calculator
Calculate RC time constants, capacitor charging and discharging, and passive low-pass or high-pass filter response.
Ω · SMD
Resistor Color Code & SMD Decoder
Decode 4, 5 or 6 resistor bands and SMD markings, or turn a resistance value into a color code.
Ω · H · F
RLC Impedance & Resonance Calculator
Calculate series or parallel RLC impedance, phase, resonance, quality factor and bandwidth with a frequency plot.
Ω · F
Series & Parallel Component Calculator
Calculate equivalent resistance or capacitance for multiple components connected in series or parallel, with a circuit diagram.
V · Ω
Voltage Divider Calculator
Calculate output voltage with load and tolerance, or find standard resistor pairs for a target voltage.
Zener · Ω · W
Zener Diode & Series Resistor Calculator
Choose or check a Zener regulator resistor across supply and load extremes, including tolerance and power.
Op-Amps
Active Filter Calculator
Design low-pass, high-pass and band-pass filters with component selection and response plots.
V · Ω · VHYS
Comparator & Schmitt Trigger Calculator
Calculate switching thresholds and hysteresis, or choose standard feedback resistors.
ΔV · G · Ω
Instrumentation Amplifier Calculator
Calculate gain, choose gain resistors and check internal output voltages.
MHz · V/µs
Op-Amp Bandwidth & Slew Rate Calculator
Estimate op-amp bandwidth, sine-wave slew requirements and amplitude or frequency limits.
V/V · Ω
Op-Amp Gain & Feedback Calculator
Calculate inverting or non-inverting op-amp gain and output, or find standard feedback resistor pairs for a target gain.
Σ · V/V · Ω
Op-Amp Summing & Difference Calculator
Calculate weighted sums or voltage differences, choose matched resistor pairs and check output limits.
TIA · V/A · pF
Transimpedance Amplifier Calculator
Convert sensor current to voltage, choose a feedback resistor and estimate capacitance and bandwidth.
Transistors
BJT Amplifier & Emitter Follower Calculator
Calculate bias, loaded gain, resistance and signal swing for NPN/PNP amplifiers.
BJT · IC · VCE
BJT Bias & Operating Point Calculator
Calculate NPN/PNP bias currents, voltages and operating region, with a DC load line.
BJT · Ω · mA
BJT Switch & Base Resistor Calculator
Size NPN or PNP switching base resistors and estimate base current and resistor/transistor dissipation.
MOSFET · W · nC
MOSFET Loss & Gate Drive Calculator
Estimate DC or PWM conduction and switching losses, gate-drive power and charging current.
°C · W · °C/W
Transistor Thermal & Heatsink Calculator
Estimate junction temperature, thermal margin, maximum dissipation and required heatsink resistance.
Electrical & Electronics
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