Electrical Tools
Practical electrical engineering tools for electricians, engineers, and hobbyists. Calculate voltage, current, resistance and power using Ohm's law and the power wheel, decode 4, 5 and 6-band resistor color codes and vice versa, calculate proper resistor values and wattage for LED circuits, compute voltage divider output voltage, calculate capacitance, charge, energy and impedance, estimate battery runtime from mAh capacity and consumption, determine proper wire gauge by current, length and voltage drop, calculate power factor, real, reactive and apparent power, compute 555 timer output frequency and duty cycle, and calculate inductance, inductive reactance and stored energy.
Calculate power factor, real power, reactive power, apparent power, and phase angle for AC circuits from any two known values.
Calculate frequency, duty cycle, and timing for 555 timer IC circuits in Astable and Monostable modes.
Calculate capacitance, charge, energy, and impedance for capacitors. Supports series and parallel combinations with real-time results.
Calculate inductance, stored energy, inductive reactance, series/parallel combinations, and LC resonant frequency with quality factor.
Calculate the right wire gauge for your electrical project based on current, voltage, distance, and acceptable voltage drop.
Calculate output voltage for resistor voltage divider circuits. Find resistor values, analyze load effects, and get E24 standard suggestions.
Calculate Voltage, Current, Resistance, and Power instantly. Enter any 2 values and get the other 2 using Ohm's Law and the Power Wheel.
Decode resistor values from color bands (4, 5, 6-band) or convert resistance values back to color codes instantly.
Estimate how long a battery will last based on capacity, current draw, and efficiency. Calculate required battery capacity for your desired runtime.
Calculate the correct resistor value, power rating, and color code for your LED circuits in single, series, or parallel configurations.