Calculated Ultraviolet Exposure Levels for a Healthy Vitamin D Status

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Version 1.0, Copyright © 2005 Ola Engelsen
Norwegian Institute for Air Research, Email:

NOTE! version 1.2 is available here: and olaeng/fastrt/VitD-ez_quartMEDandMED_v2.html

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Time and location

Month Day

Latitude (degs N) Longitude (degs E)

Skin type: Pale Caucasian Blond Caucasian Darker Caucasian Mediterranean Middle Eastern Black

Nature of exposure: Around midday Start time (hours UTC)

Sky condition Estimate cloud thickness from UV index assuming overcast sky: UV Index [0-20]

Ozone layer thickness

Surface altitude km. Range [0.0-6.0] km

Surface type