Solar Panel Angle Calculator
Find the optimal tilt angle for solar panels based on your latitude and season.
Inputs
°
Results
Optimal Tilt
40°
Azimuth (Facing)180°
Annual Average Tilt40°
Efficiency at Optimal100%
Efficiency if Flat77%
How to Use This Calculator
- Enter your site latitude in degrees.
- The calculator returns the optimal fixed tilt angle for maximum annual energy yield.
- Review the seasonal adjustments — steeper in winter, shallower in summer.
- Flat or low-tilt roofs can use ballasted racking to achieve a closer-to-optimal angle.
- Self-cleaning from rainfall requires a minimum tilt of 10–15 degrees.
How the result changes with Latitude
| Latitude | Optimal Tilt |
|---|---|
| -72 | 72° |
| -27 | 27° |
| 27 | 27° |
| 72 | 72° |
What each input means
- Latitude
- Your geographic latitude. Positive for north, negative for south.
- Season
- Select season for optimized tilt or annual average.
How this is calculated
Worked example, using the default values
- Identify Input ParametersLatitude = 40, Season = 0 = 2 input(s) provided
- Calculate Optimal TiltOptimal Tilt40 = 40
- Calculate AzimuthAzimuth180 = 180
- Calculate Annual Average TiltAnnual Average Tilt40 = 40
Engine last updated . Checked against 3 independently-derived tests — how we verify calculators.
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