Electronics Tools
3-Phase Power Calculator - Calculate three-phase power, current, or line-to-line voltage for a balanced AC system. Solve for real power (kW), apparent power (kVA), reactive power (kVAR), line current, or line voltage from the values you know. Includes a to-scale power triangle, a Wye vs Delta phase-value table, an animated three-phase waveform, a step-by-step formula walkthrough, and suggested copper wire gauge and breaker size. New
555 Timer Calculator - 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. New
Amps to Watts Calculator - Convert amps to watts for DC, AC single-phase, and AC three-phase circuits. Enter current, voltage, and (for AC) power factor to get real power in watts, plus apparent power (VA) and reactive power (VAR) shown on an animated power triangle, a step-by-step breakdown, and everyday examples of what that wattage can run. New
Antenna Length Calculator - Calculate the correct antenna length from any frequency for half-wave dipoles, quarter-wave verticals and ground planes, full-wave loops, and 5/8-wave verticals. Get the physical length in both meters and feet/inches, each dipole leg or radial, the free-space wavelength, an adjustable velocity/end-effect factor, automatic radio-band identification, an animated antenna diagram, and a full step-by-step breakdown. New
Battery Life Calculator - Calculate how long a battery will last based on capacity (mAh/Ah/Wh) and device consumption (mA/A/W). Features animated battery visualization, efficiency adjustments, and detailed runtime breakdowns for phones, laptops, IoT devices, and more. Featured
Capacitor Calculator - 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. New
Conduit Fill Calculator - Calculate NEC conduit fill percentage from your conductors and conduit. Add any mix of wire sizes and insulation types (THHN, XHHW, THW), pick your conduit (EMT, PVC Sch 40/80, RMC, IMC) or let the calculator auto-find the smallest legal trade size. See a to-scale cross-section of the packed conduit, a pass/fail fill gauge against the 53% / 31% / 40% NEC limits, and a full step-by-step area breakdown. New
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. New
Generator Size Calculator - Find out what size generator you need. Pick your appliances from a built-in library of running and starting (surge) wattages, or add your own, and this calculator sizes the generator the right way — total running watts plus only the single largest motor surge, since appliances never all start at once. See an animated startup-surge chart, a recommended generator class, a safety-margin buffer, and a full per-appliance load breakdown. New
Impedance Calculator - 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. New
Inductive Reactance Calculator - Calculate inductive reactance with the formula XL = 2πfL. Solve for reactance, frequency, or inductance in one tool, with engineering unit auto-scaling (Ω/kΩ/MΩ, Hz/kHz/MHz/GHz, H/mH/µH/nH). See an animated voltage-current waveform showing the 90° phase lag, a reactance-vs-frequency response curve, optional RMS current and reactive power, and a full step-by-step solution. New
kVA Calculator - Convert between kVA, kW, amps and volts for DC, single-phase and three-phase systems. Enter any two values and instantly get apparent power (kVA), real power (kW), reactive power (kVAR), current and voltage — visualized with an animated, to-scale power triangle. Includes power-factor breakdown and generator / UPS sizing suggestions. New
LED Resistor Calculator - 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. New
Logic Gate Simulator - 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. New
Lumens to Watts Converter - Convert lumens to watts and see the equivalent wattage across LED, CFL, halogen, and incandescent bulbs side by side. Enter a brightness in lumens (or an old incandescent watt rating) to find how many watts each bulb type draws, how much energy and money you save by switching to LED, and what the light is bright enough for. New
Lux to Lumens Calculator - Convert lux to lumens for any room by entering the target illuminance and the room area or dimensions. See the total lumens needed, a real-world figure that accounts for light loss, how many bulbs it takes, and where your brightness sits on the lux scale — with a to-scale, glowing room diagram. Supports metres and feet plus recommended lux levels for bedrooms, kitchens, offices and more. New
mAh to Wh Converter - Convert battery capacity between mAh and Wh using voltage, and instantly check whether your power bank or lithium battery is allowed on a plane. Enter mAh (or Ah) and volts to get watt-hours, the FAA/IATA carry-on verdict (100 Wh / 160 Wh limits), usable mAh at 5 V USB, and real-world run-time estimates — with an animated capacity gauge and step-by-step formula. Works both ways (mAh to Wh and Wh to mAh). New
Ohm's Law Calculator - 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.
Parallel Resistor Calculator - 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. New
PCB Trace Width Calculator - Calculate the required trace width for your printed circuit board (PCB) based on current, temperature rise, and copper weight using IPC-2221 standard formulas. Includes visual trace preview, resistance calculation, and voltage drop analysis.
Power Factor Calculator - Calculate real, reactive, and apparent power relationships, power factor correction, and power triangle analysis for AC circuits. Get step-by-step breakdown with formulas. New
RC Time Constant Calculator - 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. New
Resistor Color Code Calculator - 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.
Resistors in Series Calculator - Add any number of resistors in series to find the total resistance instantly. Enter an optional supply voltage and the calculator also solves the shared circuit current, the voltage dropped across each resistor (the voltage divider), and the power each resistor dissipates. Includes an animated series-circuit diagram with flowing current, a proportional voltage-division bar, a full per-resistor breakdown table, and a step-by-step formula walkthrough. Supports Ω, kΩ, and MΩ units. New
Resonant Frequency Calculator - 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. New
Room Lighting Calculator - Calculate the total lumens and number of light bulbs a room needs based on its type and size. Uses the professional lumen method with room-by-room foot-candle targets, adjusts for ceiling height, and shows a to-scale layout of where to place your fixtures. Supports feet and meters with LED, CFL, and incandescent wattage equivalents and a step-by-step breakdown. New
Series/Parallel Capacitor Calculator - Calculate the equivalent capacitance of capacitors wired in series or in parallel. Add any number of capacitors in pF, nF, µF, mF or F, and instantly see the total capacitance, an animated circuit diagram, and how charge and voltage split across each capacitor. Includes stored energy, a step-by-step formula walkthrough, and a side-by-side series-vs-parallel comparison that shows why capacitors combine the opposite way to resistors. New
Transformer Calculator - 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. New
Voltage Divider Calculator - 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. New
Voltage Drop Calculator - Calculate voltage drop in electrical wires based on wire type (copper/aluminum), AWG size, length, and load current. Essential for safe electrical installations, NEC compliance, and preventing power loss in residential, commercial, and industrial wiring.
Watts to Amps Calculator - Convert watts to amps for DC, AC single-phase, and AC three-phase circuits. Enter power, voltage, and (for AC) power factor to get the exact current in amperes, the formula used, a step-by-step breakdown, an animated current-flow diagram, and a suggested copper wire gauge (AWG) and circuit-breaker size. Supports W, kW, and horsepower. New
Wire Gauge Calculator - 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. New
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