Solar & Energy Calculators
5 calculators5 free calculators for solar & energy homeowners.
Attic Insulation Cost
Estimate attic insulation cost by square footage and type — blown-in fiberglass, cellulose, or spray foam — with old-insulation removal, every material compared, and a payback estimate based on ENERGY STAR energy-savings data.
Solar Battery Storage
Calculate how much battery storage you need based on your solar generation, daily usage, and backup goals. Get an instant capacity estimate and installed cost range.
Solar Panel Output Estimator
Estimate how much electricity your solar panels will produce. Enter your system size, state, and efficiency to get daily, monthly, and annual kWh output instantly.
Solar Payback Period
Calculate your solar payback period in minutes. See exactly how many years until your panels pay for themselves based on cost and savings.
Solar vs. Grid Electricity Cost
Compare the total cost of going solar versus staying on the grid over time. Enter your bill, system cost, and rate increases to see lifetime savings and payback period.