Home Energy Desk tools
Electrical Calculators
Calculate inverter capacity, electricity cost, AC and DC current, power factor, voltage drop, and single- or three-phase power.
Explore every electrical calculators
Inverter Size Calculator
Estimate continuous inverter rating and surge capability from connected loads, simultaneity, and design headroom.
Electricity Cost Calculator
Calculate daily, monthly, and annual electricity consumption and operating cost for an appliance or home-energy system.
AC Current Calculator
Estimate single-phase or three-phase AC current from real power, voltage, power factor, and efficiency.
DC Current Calculator
Estimate DC current from power, voltage, and conversion efficiency.
Power Factor Calculator
Calculate apparent power and power factor from real power, voltage, current, and phase configuration.
Cable Voltage Drop Calculator
Estimate conductor resistance, voltage drop, and percentage drop for copper or aluminum conductors using one-way length and load current.
Single-Phase Power Calculator
Calculate real power, apparent power, and estimated input energy for a single-phase AC load.
Three-Phase Power Calculator
Calculate three-phase real power, apparent power, and estimated useful output from line voltage, line current, power factor, and efficiency.
Watts, Volts and Amps Calculator
Calculate electrical power, voltage, current, resistance, and energy for basic DC or single-phase AC loads.
Whole-Home Appliance Load Calculator
Estimate daily household electricity use, peak running load, starting surge, solar energy needs, battery storage, inverter capacity, and generator size from appliance quantities and schedules.
Time-of-Use Electricity Bill Calculator
Estimate an electricity bill with peak, shoulder, and off-peak energy rates, fixed charges, demand charges, taxes, and credits.
Home Energy Carbon Emissions Savings Calculator
Estimate annual carbon dioxide emissions avoided by solar generation, efficiency upgrades, heat pumps, batteries, or EV charging changes.
How to use these tools
Choose the calculator that matches your decision, enter values from equipment labels, utility bills, manuals, or verified specifications, and test more than one scenario. Calculator results are planning estimates. Confirm electrical, structural, HVAC, battery, and code-sensitive decisions with qualified professionals and applicable local requirements.