Electrical Tools

Electricity Bill Calculator (kWh Cost)

Calculate monthly and annual electricity consumption cost based on power usage and rates (kWh)

Ohm's Law Calculator (V=IR)

Calculate voltage, current, and resistance using Ohm's Law (V=IR) for electrical circuits

Electrical Power Calculator (P=VI)

Calculate electrical power in watts using voltage and current (P=VI, P=I²R, P=V²/R)

Resistor Color Code Calculator

Calculate resistor value and tolerance from color bands (4-band, 5-band, 6-band)

LED Resistor Calculator (R=(Vs-Vf)/If)

Calculate current limiting resistor value for LED circuits and arrays

Battery Life Calculator (mAh to Hours)

Calculate battery runtime and life based on capacity (mAh/Ah) and load current

Voltage Divider Calculator (Vout)

Calculate output voltage in voltage divider circuits using series resistors

Series & Parallel Resistor Calculator

Calculate total equivalent resistance for resistors in series or parallel configurations

Wire Gauge Calculator (AWG Size)

Calculate wire diameter, cross-section area, and current carrying capacity (AWG standard)

Voltage Drop Calculator (NEC 3% Limit)

Calculate voltage drop in electrical cables and wires based on length, current, and resistance

Three-Phase Calculator (Star/Delta)

Calculate power, current, and voltage for 3-phase electrical systems (Star/Delta)

555 Timer Calculator (f=1.44/((R1+2R2)C))

Calculate resistor and capacitor values for 555 timer circuits (astable/monostable modes)

Solar Panel Calculator (Watts per Day)

Calculate required number and capacity of solar panels for photovoltaic system design

Electrical Load Calculator (Amps)

Calculate total electrical load, power demand, and sizing for residential/commercial buildings

Capacitor Energy and Charge Calculator

Calculate energy stored in a capacitor.

Three-Phase Power Calculator (kW/kVA)

Calculate active, apparent, and reactive power in three-phase systems.

Cable Size Calculator (mm2 + AWG)

Calculate appropriate cable size based on current and distance.

Equivalent Resistance Calculator

Calculate equivalent resistance for series or parallel circuit.

Battery Capacity Calculator (mAh/Wh)

Calculate battery capacity and runtime.

Solar Panel Array Sizing Calculator

Calculate number of solar panels needed.

Capacitor Calculator (Q=CV)

Calculate capacitance, charge, and stored energy in capacitors (Q=CV, E=½CV²)

Transformer Calculator (Turns Ratio)

Calculate transformer turns ratio, voltage, and current transformation (Vp/Vs = Np/Ns)

AC Circuit Calculator (RLC Impedance)

Calculate impedance, phase angle, and power in AC circuits (RLC analysis)

Impedance Calculator (Z=R+jX)

Calculate total impedance from resistance and reactance in AC circuits (Z = √(R²+X²))

Power Factor Calculator (cos phi)

Calculate power factor and required capacitance for power factor correction (PF = cosφ)

Op-Amp Gain Calculator (Inverting)

Calculate gain and resistor values for op-amp circuits (inverting/non-inverting)

LM317 Resistor Calculator (Vout)

Calculate resistor values for desired output voltage from LM317 adjustable regulator

Frequency Calculator (f=1/T)

Calculate frequency, period, and wavelength for electrical signals (f = 1/T)

Motor Current Calculator (FLA)

Calculate motor power, current, efficiency, and torque for AC/DC motors (HP to kW)

Inductor Energy Calculator

Calculate energy stored in an inductor.

RC Circuit Time Constant Calculator

Calculate time constant of an RC circuit.

RL Circuit Time Constant Calculator

Calculate time constant of an RL circuit.

Electric Motor Power Calculator

Calculate power, torque, and efficiency of an electric motor.

Capacitor Code Calculator

Convert 3-digit capacitor code to capacitance value.

Extended Ohms Law Calculator

Calculate voltage, current, resistance, and power.

Battery Runtime Calculator (Load Current)

Calculate battery runtime.

Energy Consumption Calculator (Appliance kWh)

Calculate energy consumption of devices.

3-Phase Power Calc (Formula + Solved)

Calculate three-phase electrical power.

Cable Voltage Drop Calculator

Calculate voltage drop in cable.

Breaker Sizing Calculator (NEC 240)

Calculate appropriate breaker size.

Parallel Resistance Calculator

Calculate equivalent resistance of parallel resistors.

Advanced LED Resistor

Calculate resistor for multiple LEDs in series/parallel.

Generator Sizing Calculator

Calculate proper generator size for your needs.

Inductor Calculator (XL = 2 pi f L)

Calculate inductance value and stored energy in inductors (L, E=½LI²)

Reactance Calculator (XL, XC)

Calculate capacitive and inductive reactance for capacitors and inductors (Xc, Xl)

Resonant Frequency Calculator (LC)

Calculate resonance frequency and Q-factor for LC resonant circuits (f = 1/2π√LC)

Decibel Calculator (dB Gain/Loss)

Calculate decibel levels, gain, and loss for power and voltage signals (dB, dBm, dBW)

PCB Trace Width Calculator (IPC-2221)

Calculate copper trace width for PCB boards based on current and temperature rise (IPC-2221)