All Calculators
17 free tools for solar, energy, wind, and electric vehicle calculations. No sign-up required.
Solar Calculators
Plan your solar installation with confidence.
Solar Panel Calculator
Calculate how many panels fit your roof and estimated annual production in kWh.
Open Calculator →Solar Savings Calculator
Estimate monthly and annual savings from going solar with net metering support.
Open Calculator →Solar Payback Calculator
Find your break-even timeline with federal ITC and state incentives factored in.
Open Calculator →Solar Battery Calculator
Determine how many batteries you need for home backup power.
Open Calculator →Solar Roof Calculator
Maximize your roof's solar potential based on pitch, orientation, and shading percentage.
Open Calculator →Solar Savings by State
Compare solar panel savings across all 50 US states and DC with state-specific calculators.
Open Calculator →Energy Calculators
Understand and reduce your energy costs.
Electricity Cost Calculator
Calculate the daily, monthly, and annual cost to run any device or appliance.
Open Calculator →Appliance Energy Calculator
Add multiple home appliances and see your total energy cost breakdown.
Open Calculator →LED Savings Calculator
See exactly how much you save by switching from incandescent to LED light bulbs.
Open Calculator →Carbon Footprint Calculator
Estimate your annual CO2 emissions and compare to the US average.
Open Calculator →Home Energy Audit
Get an efficiency score, energy cost breakdown, and top 5 upgrade recommendations.
Open Calculator →Electric Bill Estimator
Predict your monthly electricity bill with seasonal variation and cost breakdown.
Open Calculator →Heat Pump Calculator
Size a heat pump, estimate annual savings vs gas/oil/propane, and find your payback period.
Open Calculator →Home Electrification Planner
Plan your whole-home electrification: toggle solar, heat pump, EV, battery, insulation and more. See combined ROI, IRA credits, and CO2 reduction.
Open Calculator →EV & Wind Calculators
Make the switch to electric and renewable energy.
EV Savings Calculator
Compare monthly and annual fuel costs between gas cars and electric vehicles.
Open Calculator →EV Charging Cost Calculator
Calculate the cost to charge your EV at home or at a public station.
Open Calculator →EV Range Calculator
Estimate your EV range adjusted for temperature, speed, and terrain.
Open Calculator →Wind Energy Calculator
Estimate annual wind turbine output, financial savings, and CO2 offset.
Open Calculator →