Square Footage Roof Calculator Solar Panel Fit Calculator Select Roof Shape: Rectangle Square Select Unit: Feet (ft) Inches (in) Centimeters (cm) Enter Length: Enter Width: Select Panel Wattage (Dimensions): 200W - 4.5 ft x 3 ft (13.5 sq ft) 300W - 6 ft x 3 ft (18 sq ft) 400W - 5.6 ft x 3.7 ft (20.72 sq ft) 500W - 6.7 ft x 3.5 ft (23.5 sq ft) Calculate