Start with your electric bill and your state. Each calculator uses official data: average residential electricity prices from the EIA and solar production modeled with PVWatts.
Solar sizing
How many panels, what system size and how much they will produce.
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How many solar panels do I need?
From your electric bill to the number of panels, using your state's electricity price and sun.
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Solar system size calculator
The kW you need from your yearly kWh, with your state's solar production.
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How many solar panels for 1,000 kWh per month?
Panels and kW to cover 1,000 kWh a month, or your own number, in your state.
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How many solar panels for a 2,000 sq ft house?
Panels for your home size, from typical U.S. usage for that size and your state's sun.