Core electrical tools
Ohm’s Law CalculatorCalculate voltage, current, resistance and power from a selected pair of known values.Watts, Volts and Amps CalculatorConvert power, voltage and current for DC, single-phase AC and balanced three-phase AC.Power Triangle CalculatorCalculate apparent power, reactive power magnitude and phase angle from real power and power factor.Resistive Voltage Drop CalculatorEstimate resistive voltage drop in a two-conductor circuit.DC Voltage Drop CalculatorEstimate voltage drop in a two-conductor DC copper circuit.Fuse Rating ComparisonCompare a load current with a defined list of protective-device ratings.MCB Rating ComparisonCompare a load current with a defined list of protective-device ratings.Cable Capacity Reference CalculatorCheck a design current and voltage drop against published flat copper cable reference data.Power Consumption CalculatorEstimate daily energy use and running cost from power, daily hours and a unit tariff.Battery Runtime CalculatorEstimate usable battery energy and runtime at a constant load.Three-Phase CalculatorCalculate current, voltage, real power and apparent power for a balanced three-phase load.
Additional electrical calculators
Battery Runtime with EfficiencyEstimate usable battery energy and runtime at a constant load.kW to Amps CalculatorConvert real power to current for single-phase or balanced three-phase AC.Amps to kW CalculatorConvert current to real power for single-phase or balanced three-phase AC.Cable Area from Voltage DropEstimate the conductor area needed to meet a selected resistive voltage-drop limit.Solar Panel Output EstimateEstimate solar energy using panel power, panel count, peak sun hours and losses.Inverter Power ComparisonCompare continuous and simultaneous peak loads with a selected headroom.LED Series Resistor CalculatorCalculate an ideal series resistor and its dissipation for a constant DC supply.Voltage Divider CalculatorCalculate the unloaded output voltage of two series resistors.Fault Loop Impedance EstimateCalculate an Ohm’s Law impedance estimate from voltage and a fault-current value.Transformer VA ComparisonCalculate single-phase secondary VA and apply a user-selected headroom.