Electrical Calculators and Unit Conversions
Choose a calculator, enter your values and review formulas, tables and worked examples.
You can also ask a question in the assistant below.
What do you need to calculate?
Choose your starting unit. Each tool includes the calculation, assumptions and worked examples.
mm² to AWGCompare metric cable areas with AWG and kcmil sizes.Open calculator →Three-phase currentCalculate amps from kW, HP or kVA and line voltage.Open calculator →VA to ampsCheck current for small transformers, control circuits and UPS ratings.Open calculator →kVA to ampsConvert apparent power to current for single-phase or three-phase systems.Open calculator →kVA to kWConvert apparent power to real power using power factor.Open calculator →HP to ampsEstimate motor current with voltage, power factor and efficiency.Open calculator →
Find your conversion
Choose the units you have and the value you need to calculate.
Current and motor sizing
Real and apparent power
Horsepower conversions
Energy and cable sizes
Cable planning: choose your next check
Use ampacity and voltage drop as separate checks. Choose the tool for the information you have; review each model before using its result.
Voltage dropCheck DC, single-phase or balanced three-phase voltage drop from cable area and current.Wire ampacityCheck temperature, conductor grouping and terminal limits. Voltage drop is a separate check.Cable length and areaCompare cable areas and estimate the maximum distance for your voltage-drop target.Three-phase cable impedanceUse electrical input kW or line current, with reference or custom cable resistance and reactance.