Solar Panel Tilt Calculator
Estimate simple annual and seasonal solar-panel tilt targets, roof-angle difference, raised-edge height and preliminary racking cost.
Default project preview
32 degrees
Summer tilt
17°
Winter tilt
47°
Existing roof angle
18.4°
Tilt difference
+13.6°
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Input and output guide
What each value means
The labels and units below are part of this calculator’s visible methodology. Replace every default with measurements or product data from the actual project.
Absolute site latitude
Enter this project assumption in degrees. The current imperial default is 32 degrees. Minimum: 0. Maximum: 90.
Annual tilt adjustment
Enter this project assumption in degrees. The current imperial default is 0 degrees. Minimum: -30. Maximum: 30.
Seasonal adjustment
Enter this project assumption in degrees. The current imperial default is 15 degrees. Minimum: 0. Maximum: 30.
Existing roof pitch rise
Enter this project assumption in per 12. The current imperial default is 4 per 12. Minimum: 0.
Array length up the slope
Enter this project assumption in ft. The current imperial default is 12 ft.
Panel count
Enter this project assumption in a unitless value. The current imperial default is 12. Minimum: 1.
Tilt-racking price per panel
Enter this project assumption in a unitless value. The current imperial default is 85. Minimum: 0.
How to read the outputs
Summer tilt
annual minus seasonal adjustment. Default preview: 17°.
Winter tilt
annual plus seasonal adjustment. Default preview: 47°.
Existing roof angle
4-in-12 pitch. Default preview: 18.4°.
Tilt difference
target minus roof angle. Default preview: +13.6°.
Raised-edge geometry
simple array-length projection. Default preview: 2.81 ft.
Tilt-racking cost
12 panels. Default preview: $1,020.00.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Annual tilt is absolute latitude plus the entered adjustment. Summer and winter targets subtract or add the seasonal adjustment. Raised-edge height uses array length × sin(tilt difference).
FAQ
Solar Panel Tilt Calculator questions
Is latitude always the best fixed tilt?+
No. It is a simple starting point. Energy tariffs, seasonal demand, orientation, shading and local weather may favor another angle.
Should panels be raised above an existing roof?+
Not automatically. Flush mounting often reduces cost and wind loading even when roof pitch differs from the simple target.
Does the raised-edge result size structural supports?+
No. It shows geometry only. Racking and roof attachments require engineered product and structural verification.