Vitamin D Sun Angle Calculator

Vitamin D & Sun Angle
Understand your sunlight window
See when the sun is high enough for conditions that may support vitamin D production.
Solar elevation today

Sun position

Calculating …
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Next opportunity

Vitamin D window

Next suitable sunlight
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The 45° threshold is a practical rule of thumb, not an exact biological cutoff.
Calculator settings

Your location

Cloud cover, skin type, ozone, altitude and clothing also influence vitamin D production. This calculator is for educational purposes only and is not medical advice.