Electronics Tools

Solve balanced three-phase systems for real power (kW), apparent power (kVA), reactive power (kVAR), line current or line voltage. Includes a power triangle, a Wye vs Delta table, and suggested wire gauge and breaker size.

Calculate frequency, period, and duty cycle for 555 timer circuits in astable and monostable modes. Enter R1, R2, and C values to get instant results with waveform visualization and step-by-step formulas.

Convert amps to watts for DC, AC single-phase and AC three-phase circuits. Enter current, voltage and power factor to get real power in watts plus apparent power (VA) and reactive power (VAR) on an animated power triangle.

Calculate antenna length from any frequency for half-wave dipoles, quarter-wave verticals, ground planes, full-wave loops and 5/8-wave verticals. Get metres and feet, each leg or radial, wavelength and an adjustable velocity factor.

Work out how long a battery lasts from its capacity (mAh, Ah or Wh) and the device's draw (mA, A or W). Includes an animated battery visual, efficiency adjustment and runtime breakdowns for phones, laptops and IoT devices.

Calculate stored charge (Q=CV), energy (E=½CV²), and reactance (Xc=1/2πfC) for capacitors. Decode 3-digit ceramic capacitor codes instantly. Interactive animated diagram with step-by-step solutions.

Calculate NEC conduit fill percentage from your conductors and conduit. Mix wire sizes and insulation types, pick EMT, PVC, RMC or IMC or auto-find the smallest legal trade size, and check the 53%, 31% and 40% limits.

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

Find out what size generator you need. Pick appliances from a library of running and surge wattages, and the calculator sizes it properly - total running watts plus only the single largest motor surge, since not everything starts at once.

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

Calculate inductive reactance with XL = 2*pi*f*L, solving for reactance, frequency or inductance with automatic engineering units. See the 90-degree phase lag on a waveform, a reactance-versus-frequency curve and RMS current.

Convert between kVA, kW, amps and volts for DC, single-phase and three-phase systems. Enter any two values to get apparent, real and reactive power, current and voltage on a to-scale power triangle, with generator and UPS sizing tips.

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

Build and simulate digital logic circuits online with AND, OR, NOT, NAND, NOR, XOR and XNOR gates. Get instant truth tables, animated circuit diagrams, canonical Boolean forms and step-by-step evaluation.

Convert lumens to watts and compare the equivalent wattage across LED, CFL, halogen and incandescent bulbs. Enter a brightness in lumens or an old incandescent rating to see what each bulb draws and how much switching to LED saves.

Convert lux to lumens for any room from the target illuminance and the room area or dimensions. See the lumens needed, a realistic figure allowing for light loss, how many bulbs that takes, and recommended lux levels room by room.

Convert battery capacity between mAh and Wh using voltage, and check whether your power bank is allowed on a plane. Enter mAh and volts for watt-hours, the FAA and IATA 100 Wh and 160 Wh verdict, and usable mAh at 5 V USB.

Calculate any electrical value (Voltage, Current, Resistance, Power) using Ohm's Law. Enter any two known values to instantly compute the other two with detailed formulas and step-by-step solutions.

Calculate the total equivalent resistance of 2 to 10 resistors connected in parallel. Features an interactive circuit diagram, step-by-step formula breakdown, current distribution analysis, and power sharing visualization.

Calculate the trace width your PCB needs from current, temperature rise and copper weight using the IPC-2221 formulas. Includes a visual trace preview, resistance calculation and voltage drop analysis for the finished trace.

Calculate real, reactive, and apparent power relationships, power factor correction, and power triangle analysis for AC circuits. Get step-by-step breakdown with formulas.

Calculate RC charging and discharging curves, time constants, and voltage at any given time for resistor-capacitor circuits. Get step-by-step formulas and a complete time constant table.

Calculate resistance values from color bands with an interactive visual resistor diagram. Supports 4-band, 5-band, and 6-band resistors with real-time updates, tolerance ranges, and detailed explanations.

Add any number of resistors in series to find the total resistance. Add a supply voltage and it also solves the shared current, the voltage dropped across each resistor and the power each dissipates, with a circuit diagram.

Calculate resonant frequency, bandwidth, and Q factor for LC and RLC circuits in series and parallel configurations. Solve for frequency, inductance, or capacitance with step-by-step MathJax formulas.

Calculate the total lumens and number of bulbs a room needs from its type and size. Uses the professional lumen method with room-by-room foot-candle targets, adjusts for ceiling height, and shows where to place your fixtures.

Calculate the equivalent capacitance of capacitors in series or parallel. Add any number in pF, nF, uF, mF or F to see the total, an animated circuit diagram, how charge and voltage split, and the energy stored.

Calculate turns ratio, secondary voltage, primary and secondary current, and power for electrical transformers. Get step-by-step MathJax formulas for ideal and real transformer analysis.

Calculate output voltage from a resistor divider network. Enter input voltage, R1, and R2 to find Vout instantly. Includes reverse calculation, interactive circuit diagram, step-by-step formulas, and power dissipation analysis.

Calculate voltage drop in electrical wires from the conductor material, AWG size, run length and load current. Essential for safe installations, NEC compliance and preventing power loss in residential, commercial and industrial wiring.

Convert watts to amps for DC, AC single-phase and AC three-phase circuits. Enter power, voltage and power factor for the exact current, the formula used, a current-flow diagram and a suggested copper wire gauge and breaker size.

Calculate wire diameter, cross-sectional area, resistance per length, ampacity ratings, and voltage drop for American Wire Gauge (AWG) sizes from 4/0 to 40 AWG. Supports copper and aluminum conductors with NEC ampacity tables.