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Vitamin D Calculator
Roughly how much midday sun you need for enough vitamin D, by UV level and skin type.
Suggested sun exposure
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to arms & face, around midday
Enough for vitamin D — not a target to exceed. Protect your skin beyond this.
About vitamin D & the sun
Your skin makes vitamin D from UVB, so the amount of sun you need depends on the UV level and your skin type — darker skin needs longer. These are short, midday estimates for bare arms and face; you don't need to burn to make vitamin D, and you shouldn't. In winter or at high latitudes UVB can be too low to produce much at all, in which case diet or supplements help. This is general guidance, not medical advice.
