This calculator determines the required area of solar panels for a given power plant capacity, irradiance, and panel efficiency.
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The all-in-one solar calculator for U.S. homeowners — built on NREL PVWatts v8, EIA electricity rates, and Lawrence Berkeley install cost data. Tells you the system size, panel count, roof area, gross
To help you decide if your property is suitable for solar, this guide outlines roof space requirements and breaks down how to calculate the area needed for your home solar panel installation.
In reality, several factors can influence the actual installation, such as obstacles on the roof (chimneys, vents, antennas), shaded areas, or local regulations. Use this calculator to get a general idea of your
Calculation Example: The required area of solar panels is calculated by dividing the total power output by the product of average irradiance and panel efficiency.
Free solar panel calculator. Draw your roof on a satellite map to see how many panels fit and get estimated capacity, annual energy output, and CO2 savings.
Compute the total amount of solar radiation per building based on suitable rooftops. You''ll start by becoming familiar with the data and geography. Then, you''ll create a raster layer that maps how
Use the calculator above to translate your energy needs into a right-sized solar array. This guide explains the equations, what each input means, and how to avoid the most common
The map below shows the amount of solar energy in hours, available each day on an optimally tilted surface during the worst months of the year to generate electricity (based on accumulated worldwide
How many solar panels do I need? Use our 2025 calculator to size your system by home size, kWh usage, and location. Get panel count, roof space, and kW—free from SolarTech.
Calculate the total area needed for your solar panel installation quickly and accurately with our easy-to-use solar panel area calculator.