Solar Panel Sizing Calculator
How many panels do you actually need? Size a system from your real electricity use, your region’s sun, and a target offset.
$
Average US home bill ≈ $165/mo
$
2026 US average ≈ $0.17/kWh
%
120–150% if adding an EV or heat pump soon
$
2026 US average ≈ $2.50–$3.00/W before incentives
Panels you need
0
0 kW system · 0 sq ft roof
Annual usage to cover0 kWh
System size (DC)0 kW
Panel count0
Est. annual production0 kWh
Roof area needed0 sq ft
Estimated system cost
$0
After 30% federal tax credit
$0
Sizing estimate using regional peak-sun-hours and a standard 0.80 system derate (inverter, wiring, soiling, temperature losses). Actual production varies with roof orientation, shade, and weather. The 30% federal Residential Clean Energy Credit applies to owned systems through 2032. Not tax or financial advice.
Free calculator by CalcCottage