Electrical Calculators
4 free calculators
Ohm's law, power, voltage, current, and circuit calculators.
Amps to Watts Calculator
Convert amps to watts for DC and AC circuits. Calculate power in watts from current in amps and voltage. Free electrical calculator.
Watts to Amps Calculator
Convert watts to amps for any voltage. Calculate current draw from power rating. DC and AC (single/three phase) supported.
kWh Calculator
Calculate kilowatt hours (kWh) from watts and hours. Find energy consumption and electricity cost for any appliance.
Power Factor Calculator
Calculate power factor from kW and kVA. Convert between apparent power (VA), real power (W), and reactive power (VAR).
About Our Electrical Calculators
CalcProTool's electrical calculators are designed for users in the USA, UK, Canada, Australia, and Europe. Every calculator uses verified formulas, updates in real time, and requires no registration. All 4 tools in this category are completely free.
Each calculator page includes a full explanation of the formula used, step-by-step guidance, and answers to frequently asked questions. Our tools are designed to help you make informed decisions with confidence.