Power Electronics Calculators

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Experience advanced mathematical functions, multiple themes, calculation history, and precision engineering calculations all in one powerful tool.

Scientific Functions Multiple Themes History Mobile Ready High Precision

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sin

cos

log

Basic Electrical & Ohm's Law Calculators

Power Calculator

Calculate power from voltage and current or resistance.

P = V × I

Voltage Calculator

Find voltage from current and resistance or power.

V = P ÷ I

Current Calculator

Calculate current from voltage, resistance, or power.

I = V ÷ R

Resistor Calculator

Find resistance using Ohm's Law or color code.

R = V ÷ I

Voltage Drop Calculator New

Voltage drop, % drop and power loss in copper or aluminium wire, 1-phase or 3-phase.

Wire Gauge / Ampacity New

Convert AWG to area and resistance, and find the gauge needed for a current.

Energy Cost Calculator New

Turn an appliance's wattage and usage into kWh and running cost per day/month/year.

Electric Charge Calculator New

Charge from current and time (Q=I·t), plus coulomb, Ah/mAh and electron conversions.

Decibel (dB / dBm) New

Convert power/voltage ratios to decibels and dBm to watts.

RMS Voltage Calculator

Calculate RMS (effective) voltage from peak values.

Energy & Efficiency Calculator

Calculate energy consumption and system efficiency.

Frequency Calculator

Calculate frequency (Hz) from time period or other parameters.

Resistors & Codes Calculators

Resistor Color Code

Decode resistor color bands for value and tolerance.

SMD Resistor Code Calculator

Decode SMD resistor codes and markings.

Series/Parallel Resistor

Calculate total resistance for series/parallel networks.

LED Series Resistor Calculator

Calculate current limiting resistor for LEDs.

Resistor Power Rating New

Power dissipated and the wattage to buy, plus max current/voltage for a rated resistor.

E-Series Value Finder New

Nearest E6–E192 standard value and the best two-resistor combination.

Pull-up / Pull-down New

General pull resistor current/power, and the correct I²C pull-up range.

Wheatstone Bridge New

Bridge output voltage, balance condition, and unknown resistor at null.

Thermistor (NTC) New

Resistance ↔ temperature via the Beta and Steinhart-Hart equations.

Potentiometer / Rheostat New

Wiper voltage with taper and load, plus rheostat resistance and current.

Capacitors & Inductors Calculators

SMD Capacitor Code Calculator

Decode SMD capacitor codes and values.

Series/Parallel Capacitor

Calculate total capacitance for series/parallel networks.

Capacitor voltage Divider Calculator

Design and analyze Capacitor voltage divider circuits.

R-C Time Constant Calculator

Calculate the time constant (τ) for resistor-capacitor (RC) circuits.

Reactance (Xc & XL) New

Capacitive and inductive reactance at any frequency — solve any variable.

Energy Stored (C & L) New

Energy in a capacitor (½CV²) or inductor (½LI²), solving for any value.

RL Time Constant New

τ = L/R, settling time, and the rising current at any moment.

RLC Resonance & Q New

Resonant frequency, quality factor Q, bandwidth and half-power points.

Coil Inductance New

Single-layer air-core (Wheeler) and toroidal coil inductance.

Ceramic Capacitor Code New

Decode a 3-digit ceramic cap code to pF/nF/µF, or a value back to its code.

Circuit Analysis Calculators

Voltage Divider Calculator

Design and analyze voltage divider circuits.

Current Divider Calculator

Calculate current distribution in parallel circuits.

KVL and KCL Calculator

Apply Kirchhoff's Voltage and Current Laws to solve circuits.

Mesh Analysis Calculator

Solve complex circuits using mesh current analysis method.

Thevenin Equivalent Circuit

Find Thevenin voltage and resistance for circuit simplification.

Norton Equivalent Circuit New

Convert Thevenin to Norton (IN, RN) and analyze load current.

Superposition Theorem New

Find each source's contribution to a shared node and sum them.

Delta-Wye (Δ-Y) Transformation New

Convert three-terminal resistor networks between Delta and Wye.

Maximum Power Transfer New

Find the optimal load resistance and maximum deliverable power.

Source Transformation New

Convert a voltage source to a current source, and back.

Millman's Theorem New

Find the common node voltage of parallel voltage-source branches.

AC & Power Systems Calculators

Three-Phase Power Calculator

Calculate three-phase power in delta and wye configurations.

Power Factor Calculator

Calculate power factor, reactive and apparent power.

Power Triangle Calculator New

Real, reactive, and apparent power from any two known values.

PF Correction Capacitor Calculator New

Size the capacitor bank to raise power factor to a target value.

THD Calculator New

Total Harmonic Distortion from harmonic RMS values or percentages.

AC Line Loss Calculator New

I²R feeder/transmission loss and loss percentage.

Synchronous Speed & Slip Calculator New

Synchronous speed, motor slip, and slip frequency.

Skin Effect Calculator New

Skin depth at frequency, and AC/DC resistance ratio.

Impedance Calculator (R-L-C) New

Series or parallel R-L-C impedance magnitude |Z| and phase angle.

Line & Phase Voltage/Current Calculator New

Convert line ↔ phase voltage and current for star and delta systems.

DC-DC Converters Calculators

Buck Converter

Step-down DC-DC converter design and analysis.

Vin > Vout

Boost Converter

Step-up DC-DC converter design and analysis.

Vin < Vout

Buck-Boost Converter

Design buck-boost DC-DC converter circuits.

Vin ≶ Vout

Cuk Converter

Cuk converter design and performance calculator.

Inverted Output

SEPIC Converter

SEPIC converter design and simulation.

Non-Inverted

ZETA Converter

ZETA converter design and simulation.

Dual Inductor

DC-DC Duty Cycle Calculator New

Ideal duty cycle for Buck, Boost, and Buck-Boost converters.

Inductor Ripple Current Calculator New

Ripple current from L, or required L for a target ripple.

Output Capacitor Ripple Calculator New

Output voltage ripple from C and ESR, or required capacitance.

Converter Efficiency Calculator New

Efficiency and power loss from measured values or loss breakdown.

CCM/DCM Critical Inductance New

Minimum inductance for CCM, or the DCM boundary load current.

Flyback Transformer Calculator New

Turns ratio from duty cycle, or duty cycle from turns ratio.

Forward Converter Calculator New

Turns ratio, max duty cycle, and switch voltage stress with reset winding.

Push-Pull Converter Calculator New

Center-tapped turns ratio, 2×Vin switch stress, and diode PIV.

Half/Full-Bridge Converter Calculator New

Turns ratio and switch stress for half-bridge and full-bridge topologies.

LLC Resonant Converter Calculator New

Resonant frequency, characteristic impedance, turns ratio, and quality factor Q.

Rectifiers & Inverters Calculators

Rectifier Average & RMS Calculator New

DC and RMS output of half-wave, full-wave and 3-phase rectifiers.

Ripple & Form Factor Calculator New

Form factor, ripple factor and rectification efficiency.

Rectifier Filter Capacitor Calculator New

Smoothing capacitor size for a target ripple, or ripple from C.

SCR Firing Angle Calculator New

DC output vs thyristor firing angle for controlled rectifiers.

Inverter Modulation Index Calculator New

Fundamental output of an SPWM inverter from the DC bus and m_a.

SPWM Duty Cycle Calculator New

Instantaneous sine-triangle PWM duty cycle at any angle.

RC / RCD Snubber Calculator New

Design a ringing-damping RC or turn-off RCD snubber.

Semiconductors Calculators

Diode Calculator New

Series resistor, forward current, and power dissipation for any diode.

Zener Diode Regulator New

Analyze a shunt regulator or design the series resistor and Zener wattage.

Linear Voltage Regulator New

78xx / LDO power dissipation, efficiency, junction temp and max current.

BJT Biasing Calculator New

Q-point, currents and operating region for voltage-divider and fixed bias.

MOSFET Power Loss New

Conduction, switching and gate losses plus junction temperature.

MOSFET Gate Resistor New

Peak gate current, switching time, and gate-drive power — or size the gate resistor.

IGBT Loss Calculator New

Conduction and switching loss from Vce(sat), Eon/Eoff, plus junction temperature.

Transistor as a Switch New

Base resistor for full saturation to drive relays, LEDs, and motors.

SCR / Thyristor New

Gate trigger resistor and phase-controlled output voltage and power.

Optocoupler (CTR) New

LED resistor, output current from CTR, and output saturation design.

Schottky Diode Selection New

Voltage/current ratings, power loss, and efficiency saved versus silicon.

EV & Battery Calculators

EV Range Calculator New

Driving range from battery size and energy consumption.

Battery Capacity Calculator New

Convert Ah ↔ Wh ↔ voltage and estimate runtime.

Battery C-Rate Calculator New

C-rate, charge/discharge current and time for any capacity.

State of Charge (SoC) Calculator New

Estimate SoC and DoD from voltage or coulomb counting.

Battery Internal Resistance Calculator New

Internal resistance from voltage drop, plus I²R loss.

EV Motor Power Calculator New

Tractive force and motor power for speed, grade and acceleration.

Regenerative Braking Energy Calculator New

Kinetic energy recovered to the battery when braking.

EV Charging Cost & Time Calculator New

Energy, cost and time to charge from the charger power and price.

Battery Cycle Life Calculator New

Cycle count, throughput and lifespan for a chosen DoD.

BMS Current Rating Calculator New

Size a BMS continuous current from C-rate or load power.

Battery Charging Time

Estimate charge time for any battery and charger.

Battery Pack Design New

Design custom battery packs and get BMS recommendations.

Battery Discharge Calculator New

Calculate discharge time and current drain for batteries.

Motors & Drives Calculators

Advanced Motor Calculator

Calculate motor power, torque, speed, and efficiency.

Motor Torque & Power Calculator New

Torque, power and speed with T = 9550·P/N, in N·m, lb-ft, kW, hp.

Motor Efficiency Calculator New

Efficiency and losses from powers or 3-phase line measurements.

Motor Full-Load Current (FLA) Calculator New

Rated current of 1φ, 3φ and DC motors from power and voltage.

Motor Starting Current Calculator New

Inrush current and torque for DOL, star-delta and soft starters.

VFD (V/f) Calculator New

V/f ratio, output voltage and motor speed under VFD control.

Back-EMF Calculator New

Back-EMF from Ke and speed, or from V − Ia·Ra.

HP to kW Converter New

Convert horsepower ↔ kilowatts (mechanical and metric hp).

Magnetics & Transformers Calculators

Transformer Calculator

Calculate transformer turns ratio, voltage, and current.

VA / kVA Sizing Calculator New

Apparent power of a load, or total connected load with diversity, chart included.

Efficiency & Voltage Regulation Calculator New

Efficiency vs load curve with peak point, plus % voltage regulation.

Core & Copper Loss Calculator New

Iron vs copper loss breakdown with a visual crossing-point chart.

Turns Calculator (Faraday's Law) New

N = V/(4.44·f·B·A) — required turns or voltage from turns.

Core Selection (Area Product) Calculator New

Required core area product A_p from power, B_max and current density.

Winding Wire Gauge Calculator New

AWG wire size from winding current, plus resistance and copper loss.

Thermal & Power Loss Calculators

Power Dissipation Calculator New

Component power loss from V×I, efficiency, or duty-cycled pulse.

Junction Temperature Calculator New

Tj from the thermal stack, with a stage-by-stage chart, or max safe power.

Switching Loss Calculator New

Crossover energy and switching power for any device, with a frequency chart.

PCB Trace Temperature Rise Calculator New

IPC-2221 temperature rise, or the trace width for a target rise.

Thermal Via Calculator New

Thermal resistance of a via array for spreading heat from a hot pad.

Heat Sink Calculator

Size the heat sink you need, or find the junction temperature.

PCB & Layout Calculators

PCB Trace Width Calculator New

Width for a current, or current for a width, with a visual chart.

Trace Resistance & Voltage Drop New

Resistance, voltage drop and power loss from trace geometry.

Via Current Capacity Calculator New

How much current a via or via array can safely carry.

Microstrip Impedance Calculator New

Z₀ from trace geometry, or width for a target 50 Ω.

Copper Weight Calculator New

Convert oz ↔ µm ↔ mils, with a thickness comparison chart.

Filters & Signal Calculators

RC Low/High-Pass Filter New

Cutoff frequency, attenuation and phase with a live Bode chart.

LC Filter Calculator New

Cutoff and impedance, or design L and C for a target filter.

Op-Amp Gain Calculator New

Inverting/non-inverting gain with a clipping-aware transfer chart.

Sallen-Key Active Filter New

2nd-order fc & Q, Butterworth design, live peaking chart.

555 Timer Calculator New

Astable frequency/duty cycle and monostable pulse width.

ADC Resolution Calculator New

LSB, quantization error and SNR, with a staircase diagram.

Slew Rate & Bandwidth Calculator New

Full power bandwidth and required slew rate, with a tradeoff chart.

Solar & Renewable Calculators

Solar Panel Sizing Calculator New

Required panel wattage from your daily load and sun hours.

Battery Backup Sizing Calculator New

Required Ah/kWh from load, autonomy days and DoD.

MPPT String Sizing Calculator New

Safe series/parallel panel count for your controller.

Charge Controller Sizing Calculator New

PWM and MPPT controller current rating, from your array.

Solar Inverter Sizing Calculator New

Continuous, surge, and DC:AC ratio inverter sizing.

Solar kWh Generation Calculator New

Daily/monthly/yearly generation estimate vs your load.

Wind Power Calculator New

Turbine power output from rotor size, wind speed and Cp.

Unit Conversion Calculators

Power Unit Conversion

Convert between different power units.

Current Unit Conversion

Convert between different current units.

Voltage Unit Conversion

Convert between different voltage units.

Energy Unit Conversion

Convert between different energy units.

Inductance Unit Conversion

Convert between different inductance units.

Capacitance Unit Conversion

Convert between different capacitance units.

Resistance Unit Conversion New

Convert between microohms, ohms, kiloohms and megaohms.

Frequency Unit Conversion New

Convert between Hz, kHz, MHz and GHz.

Charge Unit Conversion New

Convert between coulombs, mAh and Ah.

Temperature Unit Conversion New

Convert between Celsius, Fahrenheit and Kelvin.

Magnetic Flux Density Conversion New

Convert between Tesla and Gauss, plus total flux in Weber.

AWG to mm² Wire Size New

Convert AWG wire gauge to diameter and cross-section.

Angle Unit Conversion New

Convert between degrees, radians and gradians.

Math & Utilities Calculators

Scientific Calculator

General-purpose scientific calculator.

Complex Number & Phasor Calculator New

Rectangular↔polar, add/subtract/multiply/divide, live phasor diagram.

Number Base Calculator New

Binary, octal, decimal and hex conversion with a bit-pattern chart.

Percentage & Ratio Calculator New

X% of Y, percent change, and ratio simplification.

Matrix Calculator New

2×2/3×3 determinant, inverse, multiply, and solve systems.

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Power Converters & Conversion Calculators