Solar Panel Calculator

Find out how many solar panels your home needs. Enter your monthly electricity use and peak sun hours to size a rooftop solar system.

kWh
h
ft²
$/W

☀️ Real sun data

Uses peak sun hours tuned to your region.

🏠 Roof check

Compares panel area against your roof space.

📈 Yearly output

Estimates annual kWh production.

🔒 Private

All calculations run locally in your browser.

Go solar

Size your system, then compare installers.

Recessed Lighting → Roof Size Sod

Related Tools

🏗 Spray Foam Insulation Cost Calculator Calculate spray foam insulation cost and coverage. Enter the wall or attic area and thickness to compare open-cell and closed-cell foam prices. 🏗 Square Footage Calculator Calculate the square footage of a house, room, yard or any space. Supports rectangles, L-shapes, triangles, circles and more with instant unit conversion. 🏗 Stair Calculator Calculate stair risers, treads, total run and stringer length. Check IRC building code limits for residential stairs and plan your staircase. 🏗 Stone Calculator Calculate how much crushed stone, gravel, river rock or flagstone you need. Enter area and depth to get cubic yards, tons and total cost. 🏗 Sub Base Calculator Estimate road base, class 5 aggregate or crushed stone sub-base for driveways, patios and pavers. Get cubic yards, tons and truck loads. 🏗 Tarmac Calculator Estimate the tarmac or asphalt you need for a driveway, path or parking area. Enter length, width and depth to get tonnes, coverage and cost.