Free AI-Powered Electrical Calculators – Size Equipment & Forecast Energy Costs

This tool calculates the protected area between two lightning rods based on the IEC 62305 standard and the Rolling Sphere Method, suitable for building, tower, and industrial facility lightning protection design. Parameter Description Current Type Select the type of current in the system: - Direct C

Calculate resistance (Ω) from V, I, P, or Z in DC and AC circuits using Ohm’s Law. Includes power factor handling for real-world accuracy. “Tendency of a body to oppose the passage of an electric current.” This is the fundamental definition of resistance: the property of a material that resists t

Free online calculator for active (real) power in DC and AC circuits. Supports voltage, current, resistance, impedance, power factor, or apparent/reactive power inputs. Active power, also known as real power, is the portion of electrical power that performs useful work in a circuit—such as produci

Calculate power factor (PF) in AC circuits using voltage, current, active power, reactive power, resistance, or impedance. Supports single-phase, two-phase, and three-phase systems. Based on IEC standards for electrical efficiency analysis. Input Parameter Symbol Unit Required Comb

Free online reactive power calculator for AC systems.Calculate reactive power (Q) in VAR for AC systems using voltage, current, active power, apparent power, or power factor. Supports single-phase and three-phase configurations for power quality analysis, capacitor bank design, and energy efficiency

Calculate impedance (Ω) in AC circuits using voltage, current, power, or resistance. Supports single, two, and three-phase systems for electrical engineering and power analysis. Impedance is the total opposition of a circuit to the flow of alternating electric current, measured in ohms (Ω). It inc

Calculate apparent power (VA) in AC/DC circuits using voltage, current, power factor, resistance, or impedance. Supports single, two, and three-phase systems for electrical engineering. Apparent power is the vector sum of active and reactive power, representing total power supplied by the source.

Calculate torque (N·m, ft·lbf) or power (kW, HP) from RPM using the mechanical power-torque-speed relationship. Supports motors, engines, pumps, turbines, and gear systems for engineering design and analysis. This tool calculates torque (T) in rotating mechanical systems using power (P) and rotati

Calculate accurate battery runtime using Peukert effect, depth of discharge (DoD), and series/parallel configurations. Supports lead-acid, AGM, gel, and lithium-ion for solar, EV, UPS, and off-grid systems. This tool estimates the theoretical runtime of a battery under a given load by considering

Calculate heat energy (joules) dissipated in resistors using Joule's Law: Q = I²Rt. Essential for circuit design, thermal safety, and power loss analysis in electrical systems. This tool calculates the heat energy (Q) dissipated as thermal energy in resistive elements of an electrical circuit usin