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health.vitamin-d-sunlight Calculator
Estimates cutaneous vitamin D₃ production from UV index, skin type, body area exposed, and exposure duration, in IU per session. In the UK above 52°N latitude, vitamin D synthesis is impossible from October to March regardless of sun exposure — supplementation is required.
Inputs
Uv Index
Reference formula or conversion factor shown for context.
Skin Type
Reference formula or conversion factor shown for context.
Exposed Area Pct
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Time Minutes
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Results
estimated vitamin D production (IU)
The result of multiplying all input values together.
daily requirement (IU)
Sample size or count used in the calculation.
exposure adequate?
Whether the computed capacity, strength, or resource meets the minimum requirement.
SPF 30 sunscreen
Sample size or count used in the calculation.
latitude effect
The value at the specified point or condition.
UVI 5, skin type 3, 25% exposed
The classification or type assigned based on the inputs.