Electrical, Solar & Energy Calculators
14 free calculators for electrical, solar and energy.
Energy planning needs a few reliable conversions. These calculators cover watts to amps, wire size, voltage drop, generator size, battery runtime, solar system and battery size, solar output, solar payback and panel cost, electricity and EV charging cost, BTU needs and heat pump savings.
All Electrical, Solar & Energy calculators
Solar Panel Cost CalculatorElectrical, Solar & EnergySolar Payback CalculatorElectrical, Solar & EnergyEV Charging Cost CalculatorElectrical, Solar & EnergyVoltage Drop CalculatorElectrical, Solar & EnergyBTU (AC Sizing) CalculatorElectrical, Solar & EnergySolar System Size CalculatorElectrical, Solar & EnergySolar Battery Size CalculatorElectrical, Solar & EnergyElectricity Cost CalculatorElectrical, Solar & EnergyGenerator Size CalculatorElectrical, Solar & EnergyBattery Runtime CalculatorElectrical, Solar & EnergySolar Panel Output CalculatorElectrical, Solar & EnergyWire Size CalculatorElectrical, Solar & EnergyWatts to Amps CalculatorElectrical, Solar & EnergyHeat Pump Savings CalculatorElectrical, Solar & Energy
How to get good results
These are planning tools. Wire sizes, breakers and installs must follow the National Electrical Code and local rules, and the work should be done or checked by a licensed electrician.
Last updated: November 2026