Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Solar Roof Area Calculator

Determine how many solar panels fit on your roof by entering its dimensions, pitch angle, and usable area percentage. Ideal for homeowners and installers planning a new solar installation.

Roof Length (feet)

Roof Width (feet)

Roof Pitch

Usable Roof Area

Panel Size (sq ft)

Fill in the required fields to see your result.

Solar Energy

Solar Financing Calculator

Compare the monthly loan payment and total interest cost of financing a solar installation versus paying cash. Ideal for homeowners evaluating solar loan offers before signing.

Total System Cost ($)

Down Payment ($)

Solar Loan Interest Rate (%)

Loan Term

Federal Tax Credit (%)

Fill in the required fields to see your result.

Key differences

	Solar Roof Area Calculator	Solar Financing Calculator
Category	Solar Energy	Solar Energy
Inputs required	5	5
Result	Maximum Panels That Fit (panels)	Monthly Loan Payment ($)
What it does	Determine how many solar panels fit on your roof by entering its dimensions, pitch angle, and usable area percentage. Ideal for homeowners and installers planning a new solar installation.	Compare the monthly loan payment and total interest cost of financing a solar installation versus paying cash. Ideal for homeowners evaluating solar loan offers before signing.