Vitamin D Calculator

Estimate vitamin D production from sun exposure.

100% private — no uploads Free & unlimited Read tutorial

See how it works

Watch a quick simulation of this tool in action — no file needed.

How to use Vitamin D Calculator

Follow these steps — everything happens instantly in your browser.

  1. 1

    Step 1. Enter sun exposure time in minutes.

  2. 2

    Step 2. Enter the percentage of body area exposed.

  3. 3

    Step 3. Pick your skin type (Fitzpatrick I–VI).

  4. 4

    Step 4. Pick the UV conditions (season, time of day, indoor/outdoor).

  5. 5

    Step 5. Read estimated IU produced plus safe exposure and burn thresholds.

Why use this tool

Frequently asked questions

Everything you might want to know about vitamin d calculator.

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