Solar Panel Tilt Angle Calculator

Rule of thumb: tilt ≈ your latitude. UK (52°N) → ~35°; US varies 25–45°.

Result

Optimal tilt52°
Efficiency vs ideal100%
Flat (0°) penalty38% loss

Solar Panel Tilt Angle Calculator — FAQs

Does tilt really matter?

Within ±10° of latitude the difference is small (~2–3% annual). Steeper winter tilt gains more than flat loses in summer.

Flat roof?

Use 10–15° minimum for self-cleaning — rain pools below that. Ballasted frames at 10–15° lose ~7% vs optimal but avoid penetrations.

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