Health & Fitness · Free tool
Vitamin D Dose Calculator
Suggested daily IU for maintenance or deficiency repletion — accounting for age and sun exposure.
Updated April 2026
Suggested dose
2,000 IU/day
No blood level provided — maintenance estimate
1,500–2,000 IU/day (low sun exposure)
Not medical advice — consult a provider before starting or adjusting supplements, especially at repletion doses.
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What it does
Get a starting IU recommendation — always confirm with your provider.
Runs entirely in your browser — no upload, no account, no watermark. For more tools in this category see the full tools index.
How to use it
- Enter age and level if known.
- Set sun exposure.
- Read suggested IU.
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