Electrical & Electronics

Amps To Kilowatts Calculator

Convert electrical current (amps) to power (kilowatts) for DC, AC single phase, and AC three phase circuits with power factor calculations.

Amps To kVA Calculator

Convert electrical current (amps) to apparent power (kilovolt-amperes) for single-phase and three-phase AC circuits with voltage type selection.

Amps To VA Calculator

Convert electrical current (amps) to apparent power (volt-amperes) for single-phase and three-phase AC circuits with line-to-line voltage calculations.

Amps to Volts Calculator

Convert amps to volts using power (watts) or resistance (ohms) with our free online calculator.

Amps To Watts Calculator

Convert electrical current in amperes (A) to power in watts (W) for DC, AC single phase, and AC three phase circuits with power factor calculations.

Electricity Calculator

Calculate electrical power, voltage, current, and resistance using Ohm's law and power formulas for DC and AC circuits.

Battery Life Calculator

Calculate battery life, runtime, and capacity for various devices. Input battery capacity, current draw, and efficiency to get accurate runtime estimates.

Voltage Drop Calculator

Calculate voltage drop in electrical wires based on wire size, material, length, current, and phase type. Free online voltage drop calculator for DC and AC circuits.

Resistor Calculator

Calculate resistor values using color codes, find total resistance in parallel/series circuits, and compute conductor resistance online.

Capacitor Design Calculator

Calculate capacitance, charge, voltage, and stored energy for capacitors using C=Q/V, U=½CV², parallel plate, and cylindrical capacitor formulas.

Capacitors Series Parallel Calculator

Calculate the equivalent capacitance of capacitors connected in series or parallel configurations. Supports multiple capacitors with unit selection (F, mF, µF, nF, pF).

Inductor Calculator

Calculate solenoid and flat spiral air core coil inductance with solve for turns, permeability, area, and coil length using L = μN²A/l and Wheeler formula.

Passive Crossover Calculator

Design passive crossover networks for speaker systems. Computes inductor and capacitor values for 1st to 4th order audio filters.

RC RL Time Constant Calculator

Calculate time constants for RC (resistor-capacitor) and RL (resistor-inductor) circuits online. Free electronics time constant calculator.

Resistance Converter

Convert electrical resistance values between ohms, kilohms, megohms, and milliohms with our free online resistance unit converter.

Soil Resistivity Calculator

Measure soil resistivity using the Wenner four-pin method. Solve for resistivity, electrode spacing, voltage, or current for grounding system design.

Decibel dB Calculator

Calculate power and voltage gain or loss in decibels, convert between dB and linear scale, and analyze signal levels with dBm and dBW conversions.

Impedance Calculator

Calculate the total impedance of RLC series and parallel circuits at any frequency. Get magnitude, phase angle, phasor diagram, resonant frequency, and Q factor instantly.

Karnaugh Map Solver

Minimize Boolean expressions using an interactive 2, 3, or 4 variable Karnaugh Map (K-Map) solver with SOP and POS results.

LED Resistor Calculator

Calculate the correct current-limiting resistor for LED circuits. Supports single and series LEDs, finds nearest E24 standard resistor values, and shows power dissipation.

RMS to Watts Converter

Convert between RMS watts and peak watts for audio equipment using the sine wave power formula.

Reactive Energy Converter

Convert reactive energy between volt-ampere reactive hour, kilovolt-ampere reactive hour, and megavolt-ampere reactive hour.

Solar Panel Calculator

Estimate solar array size, number of panels, and roof area needed based on electricity consumption and location.

Solar Panel Wattage Calculator

Calculate recommended solar panel wattage from annual electricity use, solar hours, and environmental factors.

Battery Charge Time Calculator

Calculate how long it takes to charge any battery based on capacity, charging current, state of charge, and battery type.

Appliance Depreciation Calculator

Calculate the actual cash value of your home appliances with our free depreciation calculator. Supports 30+ appliance types with preset rates.

Appliance Wattage Calculator

Estimate your household electricity consumption and cost. Add multiple appliances with wattage, quantity, and runtime to calculate daily and monthly energy usage.

Electricity Cost Calculator

Calculate your electricity costs based on power consumption, energy price, and usage time. Free online electricity cost calculator with daily and annual estimates.

Electricity Cost Single Usage

Calculate the cost of running a single electrical appliance for one usage session. Free online single-use electricity cost calculator.

Generator Wattage Calculator

Calculate the total wattage your generator needs to power your appliances. Enter rated and surge watts for each device to determine the right generator size.

Headphone Power Calculator

Calculate power, voltage, and current needed to drive your headphones. Find out if you need a headphone amplifier based on impedance and sensitivity.

LED Savings Calculator

Compare LED and traditional bulb costs including electricity and replacements. See total savings and break-even point instantly.

Lighting Calculator

Calculate required lumens and number of light bulbs for any room based on area, illumination level, and bulb type.

Microwave Wattage Converter

Convert microwave cooking times between different wattages with this free browser tool. Enter label power and your microwave setting to adjust recipes safely.

Recessed Lighting Calculator

Calculate optimal recessed lighting spacing and placement for any room. Plan your ceiling lighting layout with rows, columns, and center fixtures.

MVA Calculator

Calculate the Market Value Added (MVA) using current market value and capital invested. Free online MVA calculator with share price mode.

Phase Shift Calculator

Calculate the phase shift, amplitude, period, frequency, and vertical shift of any sine or cosine wave. This free browser tool gives instant results, no signup.

Battery Size Calculator

Size lead-acid or lithium-ion batteries from load power, voltage, runtime, and leftover charge using chemistry-specific capacity formulas.

Cable Impedance Calculator

Calculate characteristic impedance, capacitance, inductance, and propagation delay for coaxial and twisted pair cables from geometry and dielectric constant.

Crosstalk Calculator

Estimate PCB trace crosstalk coupling from trace geometry, substrate dielectric, rise time, and parallel route length for microstrip and stripline layouts.

Duty Cycle Calculator

Calculate duty cycle from pulse width and period, or from average and peak power, with duty factor and pulse energy.

Impedance Matching Calculator

Calculate L-network inductor and capacitor values for RF impedance matching between source and load impedances.

LM317 Calculator

Calculate LM317 output voltage and resistor values for adjustable linear voltage regulator circuits.

Logic Gate Calculator

Evaluate AND, OR, NOT, NAND, NOR, XOR, and XNOR logic gates with truth table output.

Op Amp Gain Calculator

Calculate operational amplifier voltage gain for inverting and non-inverting circuits from input and feedback resistor values.

PCB Impedance Calculator

Calculate PCB trace characteristic impedance for microstrip and stripline layouts using trace width, substrate height, and dielectric constant.

PCB Trace Current Calculator

Estimate maximum safe current for PCB copper traces from width, copper weight, layer location, and allowed temperature rise using IPC-2221.

PCB Trace Resistance Calculator

Calculate DC resistance of a PCB trace from length, width, copper thickness, and optional temperature coefficient.

PCB Trace Width Calculator

Find the minimum PCB trace width needed for a target current, copper weight, layer location, and temperature rise using IPC-2221.

Pi Attenuator Calculator

Calculate pi attenuator resistor values for equal or unequal impedance RF circuits from attenuation in dB and source/load impedance.

Total Harmonic Distortion Calculator

Calculate total harmonic distortion (THD%) from fundamental and harmonic amplitude values for audio and power systems.

100 Amp Wire Size Calculator

Find the correct wire gauge for 100 amp circuits using NEC ampacity tables, voltage drop, and conductor material.

12V Wire Size Calculator

Calculate minimum wire gauge for 12V DC circuits based on current, length, and allowable voltage drop.

220V Wire Size Calculator

Calculate the right wire gauge for 220V circuits by entering amps, distance, and conductor material. This free tool checks NEC ampacity and voltage drop.

24V Wire Size Calculator

Calculate the minimum wire gauge for 24V DC systems using current draw, cable length, and allowed voltage drop. Get safe sizing free in your browser, no signup.

3 Phase Motor Amperage Calculator

Calculate three-phase motor full-load amperage from horsepower, voltage, efficiency, and power factor.

AC Wattage Calculator

Calculate AC wattage from voltage, current, and power factor for resistive and reactive loads.

Amp to Wire Size Calculator

Enter amps, conductor material, and voltage drop to find the minimum NEC wire gauge for your circuit. This free browser calculator gives safe, fast results.

Attenuation Calculator

Calculate signal attenuation in decibels from power or voltage ratios for RF and audio engineering.

Boost Converter Calculator

Design DC-DC boost converters by calculating output voltage, duty cycle, inductor current, and power. Free browser tool, no signup, get instant results.

Breaker Size Calculator

Calculate required circuit breaker amperage from load watts, voltage, and number of phases with NEC sizing guidance.

Bridge Rectifier Calculator

Calculate peak, average, and RMS output voltage of a bridge rectifier from AC input with and without load capacitor.

Buck Converter Calculator

Calculate output voltage, duty cycle, inductor ripple current, and efficiency for DC-DC buck converter circuits.

Capacitive Transformerless Power Supply Calculator

Calculate dropping capacitor value, output current, and power dissipation for transformerless supplies, then size zener and LED circuits safely for free.

Capacitor Size Calculator

Calculate required capacitor size for power supply ripple filtering based on load current, frequency, and acceptable ripple voltage.

Copper Wire Weight Calculator

Calculate copper wire weight from AWG gauge, length, and wire type for electrical installations.

Current Divider Calculator

Calculate branch currents in parallel resistor networks using the current divider rule.

Cutoff Frequency Calculator

Calculate RC and LC filter cutoff frequencies for low-pass and high-pass circuits.

dB Gain Calculator

Convert voltage or power ratios to decibel gain. Use 20 log for voltage and 10 log for power with step-by-step calculations.

DC Wire Size Calculator

Recommend DC wire gauge (AWG) from current, run length, and voltage drop limit using standard copper and aluminum resistance tables.

Delta to Wye Calculator

Convert delta (Δ) resistor networks to equivalent wye (Y) resistors using Ra, Rb, and Rc formulas with step-by-step solutions.

EIRP Calculator

Calculate effective isotropic radiated power (EIRP) from transmitter power and antenna gain for RF compliance.

Electrical Power Calculator

Calculate electrical power from voltage, current, and resistance using P = VI, P = I²R, and P = V²/R formulas.

Electric Motor Torque

Calculate electric motor torque from power and RPM using metric or imperial formulas, plus synchronous speed and slip for AC motors.

Flyback Converter Calculator

Design flyback SMPS circuits: compute duty cycle, peak currents, and inductance from input voltage, output power, and switching frequency.

Forward Converter Calculator

Calculate forward converter output voltage and ripple current from duty cycle, windings, inductance, and switching frequency.

Free Space Path Loss Calculator

Calculate FSPL in dB from frequency, distance, and antenna gains for RF link budget analysis.

Fresnel Zone Calculator

Calculate Fresnel zone radius for RF links from frequency, distance, and zone number for line-of-sight planning.

Generator Power Calculator

Calculate generator power output from voltage, current, efficiency, and power factor for AC and DC systems.

HP to Amps Calculator

Convert horsepower to amps for DC and AC motors using voltage, efficiency, and power factor.

High Pass Filter Calculator

Calculate RC high-pass filter cutoff frequency, capacitor value, or resistance for audio and electronics circuits.

Ideal Transformer Calculator

Calculate secondary voltage, primary current, and turns ratio for ideal transformers from primary voltage and load current.

Inductive Reactance Calculator

Find inductive reactance from inductance and frequency, or solve for either value, with this free browser tool. No signup needed for quick XL = 2πfL results.

Inductor Energy Calculator

Calculate energy stored in an inductor from inductance and current using E = ½LI².

Insertion Loss Calculator

Calculate insertion loss in decibels from power or voltage before and after network insertion.

Internal Resistance Calculator

Calculate internal resistance and power loss from EMF, terminal voltage, and load current.

Inverting Buck Boost Converter Calculator

Calculate output voltage and duty cycle for inverting buck-boost DC-DC converters.

Joule Heating Calculator

Calculate power dissipated and heat generated by electrical current through a resistor.

J-Pole Antenna Calculator

Calculate J-pole antenna element lengths and feed point for VHF and UHF ham radio bands.

KVA Calculator

Calculate kilovolt-amperes (kVA) from voltage, current, and power factor.

KVA to Amperage Calculator

Convert kVA to amperes for single-phase and three-phase electrical systems.

LC Filter Calculator

Calculate LC tank resonant frequency, inductance, or capacitance for filter and oscillator circuits.

Magnetic Force on Current Wire Calculator

Calculate magnetic force on a current-carrying wire in a magnetic field using F = BIL sin θ.

Low Pass Filter Calculator

Calculate cutoff frequency, resistor, and capacitor values for RC low-pass filters.

Magnetic Field Straight Wire Calculator

Calculate magnetic field around a straight current-carrying wire from current and distance. Free browser tool uses Ampere law and shows results instantly.

Magnetic Force Between Wires Calculator

Calculate attractive or repulsive force between parallel current-carrying wires.

NE555 Astable Calculator

Calculate NE555 astable multivibrator frequency and duty cycle from resistor and capacitor values.

MOSFET Calculator

Calculate MOSFET drain current in linear and saturation regions from gate voltage, threshold voltage, and K parameter.

MOSFET Threshold Voltage Calculator

Estimate MOSFET threshold voltage from oxide capacitance, substrate doping, surface potential, and body effect. Get fast Vth results for MOSFET design.

Modulation Calculator

Calculate AM and FM modulation index, bandwidth, and sideband levels for radio signals.

Natural Frequency Calculator

Calculate natural frequency for spring-mass and pendulum systems from stiffness, mass, and geometry. Free browser tool for quick f_n results and design checks.

Noise Figure Calculator

Calculate noise figure and noise factor from input and output signal-to-noise ratios in dB.

Ohms Law Calculator

Solve Ohms law for voltage, current, and resistance with real-time calculations and step-by-step electrical formulas.

Ohms Law Current Calculator

Calculate electric current from voltage and resistance using Ohms law with instant results and formula breakdown.

Ohms Law Power Calculator

Calculate electrical power from voltage and current, or resistance and current, using Ohms law power formulas.

Parallel Resistor Calculator

Calculate the equivalent resistance of two or more parallel resistors instantly. This free browser tool shows step-by-step math, so you can verify results fast.

Ohms Law Resistance Calculator

Find electrical resistance from voltage and current with Ohm's law. Enter volts and amps to get R = V/I instantly, with step-by-step work. Free, no signup.

Parallel Capacitor Calculator

Add any number of capacitors in parallel and get total equivalent capacitance instantly, with the step-by-step formula shown. Free, browser-based, no signup.

Parallel Inductors Calculator

Calculate equivalent inductance of inductors connected in parallel using reciprocal sum formulas.

Power Dissipation Calculator

Calculate power dissipation in a resistor from voltage, current, or resistance using Joule heating formulas with step-by-step math.

Power Factor Calculator

Calculate power factor from real and apparent power or from phase angle with step-by-step electrical engineering formulas.

RC Circuit Calculator

Calculate RC circuit time constant, capacitor voltage, and charging current over time with step-by-step exponential decay formulas.

Resistor Noise Calculator

Calculate Johnson-Nyquist thermal noise voltage and power spectral density for resistors at given temperature and bandwidth.

Resonant Frequency LC Calculator

Calculate resonant frequency of LC circuits from inductance and capacitance values with step-by-step formulas.

RLC Circuit Calculator

Calculate impedance, resonant frequency, and quality factor of series and parallel RLC circuits with step-by-step AC analysis.

RLC Impedance Calculator

Calculate total impedance magnitude and phase angle of RLC circuits at any frequency with reactance breakdown.

RMS Voltage Calculator

Calculate RMS voltage from peak, peak-to-peak, or average AC voltage values

Series Inductors Calculator

Calculate total inductance for up to six inductors wired in series and view the step-by-step math. This free browser tool needs no signup and runs instantly.

Series Resistor Calculator

Calculate total resistance of resistors connected in series with support for up to six resistors and step-by-step math.

Shockley Diode Calculator

Calculate diode forward current using the Shockley diode equation with saturation current, ideality factor, and thermal voltage.

Signal to Noise Ratio Calculator

Calculate SNR in decibels from signal and noise power (10 log) or amplitude (20 log) ratios.

Solenoid Inductance Calculator

Calculate solenoid inductance from number of turns, coil area, length, and core permeability using L = mu*N^2*A/l.

Solenoid Magnetic Field Calculator

Calculate the magnetic field inside a solenoid from current, turns per length, and core permeability. This free browser calculator gives instant results.

Spherical Capacitor Calculator

Calculate the capacitance of a spherical capacitor quickly from inner and outer radii and the dielectric constant. Free browser tool, no signup required.

Three Phase Calculator

Calculate three-phase real power, apparent power, and phase voltage for balanced wye and delta AC systems. Free browser tool runs instantly with no signup.

Transformer Sizing

Size transformers from load kVA, voltage, and power factor.

Transistor Biasing

Calculate base current, collector current, and collector voltage for a fixed-bias BJT transistor circuit.

Transistor Biasing Calculator

Calculate base current, collector current, and collector voltage for a fixed-bias BJT transistor circuit.

Voltage Divider Calculator

Calculate output voltage from input voltage and resistor values in a voltage divider circuit.

Voltage Regulation Calculator

Calculate voltage regulation percentage from no-load and full-load voltages for power supply and transformer analysis.

Watt Calculator

Calculate electrical power in watts from voltage, current, and resistance using P=VI, P=I²R, and P=V²/R.

Wattage to Amperage Calculator

Convert watts to amps for DC and AC circuits using voltage, power factor, and phase type.

VSWR Calculator

Calculate VSWR from reflection coefficient, forward and reflected power, or max and min voltage in transmission lines.

Watt Hours Calculator

Calculate watt-hours from power and time, then convert to kilowatt-hours, joules, or amp-hours at a given voltage. Free, instant, browser-based, no signup.

Watts to Amps Calculator

Convert watts to amps for DC, single-phase AC, and three-phase AC circuits with power factor.

Watts to Heat Calculator

Convert electrical watts to BTU per hour and estimate heating output for electric heaters and appliances instantly with this free browser tool, no signup needed

Wheatstone Bridge Calculator

Calculate unknown resistance in a Wheatstone bridge circuit from three known resistors.

Wire Gauge Calculator

Convert AWG wire gauge to diameter, cross-sectional area, and resistance per length.

Wire Resistance Calculator

Calculate electrical wire resistance from length, cross-section, and resistivity with temperature correction.

Battery Capacity Calculator

Estimate battery amp-hour and watt-hour capacity from voltage, current, and runtime for electronics and backup power.

LCR Calculator

Estimate liquidity coverage ratio from high-quality liquid assets and net cash outflows for banking metrics.