Power & Energy Calculators: Free Electrical Tools for Watts & kWh

Capacitor Energy Calculator

Calculate the energy stored in a capacitor using capacitance and voltage. Instant results for electronics, RC circuits, and energy storage applications.

Electrical Power Calculator

Calculate electrical power for DC and AC circuits quickly. Find real, apparent, and reactive power using voltage, current, and power factor values.

Negative Sequence Voltage Calculator

Calculate negative sequence voltage easily using this 3-phase voltage unbalance calculator. Ideal for motor protection and system fault analysis.

Voltage Unbalance Calculator

Calculate voltage unbalance using the ANSI method and sequence components (VUF). Input phase magnitudes or phasors (Va, Vb, Vc) to get % unbalance, VUF, and step-by-step results.

Mechanical Power Calculator

Instantly compute mechanical power by entering force and speed (or torque and angular velocity). Engineers’ quick tool for accurate power output estimation.

Effective Radiated Power Calculator

Easily calculate the Effective Radiated Power (ERP) of an antenna system using transmitter power, cable loss, and antenna gain in watts or dBm.

Speed to Power Calculator

Instantly convert rotational speed (RPM) and torque to mechanical power in watts, kilowatts, or horsepower using this Speed to Power Calculator.

Torque to Power Calculator

Easily calculate power output from torque and rotational speed (RPM). Find mechanical power in watts or horsepower using this torque-to-power calculator.

Pump Power Calculator

Calculate hydraulic and motor power for pumps using flow rate, head, efficiency, and fluid density. Ideal for engineers and system designers in water and industrial applications.

Wheel Horsepower Calculator

Calculate wheel horsepower (WHP) and brake horsepower (BHP) instantly. Estimate drivetrain losses and engine efficiency for accurate vehicle performance analysis.

Pump Shaft Power Calculator

Calculate the required pump shaft power using flow rate, head, efficiency, and fluid density. Ideal for hydraulic engineers and pump selection applications.

Extruder Power Calculator

Estimate the motor power required for plastic or rubber extrusion based on output rate, material type, and efficiency with this accurate Extruder Power Calculator.

Flywheel Power Calculator

Calculate flywheel power, torque, and stored energy from mass, speed, and radius. Ideal for mechanical design, motor systems, and energy recovery analysis.

Air Conditioner Electricity Cost Calculator

Estimate your AC running cost per hour, day, or month. Calculate electricity usage, power rating, and energy cost to manage home cooling expenses efficiently.

Battery Bank Size Calculator

Calculate battery bank size for your solar, inverter, or backup system. Get total capacity in Ah and kWh by entering load, runtime, and system voltage.

Active Power Calculator

Calculate real power in AC circuits using voltage, current, and power factor. Perfect for electrical engineers, students, and energy system analysis.

Steam Engine Power Calculator

Calculate steam engine power using pressure, piston area, stroke, and RPM. Perfect for mechanical engineering, engine design, and performance analysis.

Vertical Jump Power Calculator

Calculate the power generated during a vertical jump using body weight, jump height, and time. Ideal for athletes, coaches, and fitness enthusiasts.

Received Power Calculator

Calculate received power in RF or wireless systems using transmitted power, gains, losses, and distance. Ideal for engineers and communication system analysis.

Peak Envelope Power Calculator

Calculate PEP for RF transmitters using RMS voltage or current. Ideal for amateur radio, RF engineers, and transmitter design.

Average Power Calculator

Calculate average power in AC or DC circuits using voltage, current, and power factor. Ideal for engineers, students, and energy efficiency analysis.

Three Phase Power Calculator

Calculate active, reactive, and apparent power in three-phase AC systems using voltage, current, and power factor. Ideal for engineers, electricians, and students.

Reactive Power Calculator

Calculate reactive power in AC circuits using voltage, current, and power factor. Ideal for engineers, electricians, and students analyzing inductive/capacitive loads.

kVAR to Farad Calculator

Convert kVAR to capacitance in Farads instantly. This calculator helps size power factor correction capacitors for single-phase or three-phase electrical systems.

Micro-Farad to kVAR Calculator

Convert microfarads (µF) to reactive power (kVAR) easily. Ideal for calculating capacitor bank ratings and power factor correction requirements in AC systems.

Voltage to Energy Calculator

Quickly convert voltage, current, and time into electrical energy in joules or watt-hours using this Voltage to Energy Calculator for circuits and power systems.