Vitamin D Daily Intake Reference

This vitamin D calculator is an age-based US intake reference, not a deficiency test. Enter your age in whole years, from 1 to 120. The result shows a reference amount for total daily intake; it does not accept diet, supplement or sunlight inputs, and it cannot determine your blood vitamin D level.

The NIH consumer fact sheet lists 600 IU daily for ages 1–70 and 800 IU from age 71. Use those numbers to understand the reference shown here, rather than automatically adding that amount as a supplement. The result does not replace an existing treatment plan.

How Much Vitamin D Do You Need?

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Key Takeaway: A recommended dietary allowance (RDA) is a population reference for healthy people, not an individualized treatment dose. Infants have an adequate intake (AI), and are outside this calculator's age range. The upper limit is a separate ceiling, not a target. NIH definitions and Table 2

Age group	US daily reference	US daily upper limit
Birth–6 months	400 IU (AI)	1,000 IU
7–12 months	400 IU (AI)	1,500 IU
1–3 years	600 IU (RDA)	2,500 IU
4–8 years	600 IU (RDA)	3,000 IU
9–18 years	600 IU (RDA)	4,000 IU
19–70 years	600 IU (RDA)	4,000 IU
71+ years	800 IU (RDA)	4,000 IU
Pregnant/breastfeeding teens and adults	600 IU (RDA)	4,000 IU

Sources: NIH consumer tables, recommended amounts and upper limits. Count food, beverages and supplements together when comparing intake with the upper limit. A clinician may prescribe a different amount for a defined indication; this table is not a treatment protocol.

The 2024 Endocrine Society prevention guideline advises against doses above reference intakes for healthy adults under 75 without established treatment or testing indications. It suggests supplementation for selected groups, including adults 75+, pregnancy, children and adolescents, and high-risk prediabetes. These recommendations do not establish one higher dose for everyone. It also advises against routine vitamin D testing in the populations considered. Endocrine Society guideline summary

Regional difference: NHS advice for the UK is 10 micrograms (400 IU) daily from age 1, with seasonal or year-round supplementation advice depending on age and circumstances. Do not combine that advice with US reference values into a single universal prescription. NHS vitamin D guidance

Vitamin D Sources

Sun exposure: Sunlight contributes to vitamin D production, but this tool does not convert minutes outdoors into IU. NIH describes substantial variation and uncertainty about the exposure needed. There is no sunlight-dose estimate in the calculation. NIH sun exposure section

Food sources: The following examples reproduce the serving definitions in NIH's food table; they are not promises about every brand or preparation. NIH Table 3

Food and serving	Vitamin D
Sockeye salmon, cooked, 3 ounces	570 IU
Atlantic sardines, canned in oil, drained, 2 sardines	46 IU
Fortified 2% milk, 1 cup	120 IU
Fortified soy, almond or oat milk, 1 cup	100–144 IU
Large scrambled egg	44 IU
Cereal fortified with 10% vitamin D Daily Value, 1 serving	80 IU
White mushrooms, raw, sliced, UV-exposed, ½ cup	366 IU

Check your product's Nutrition Facts label and serving size before adding up amounts. Fortification is not universal: the NHS notes that UK cow's milk is generally not fortified with vitamin D. NHS food sources

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Note: A 25-hydroxyvitamin D blood result needs context. NIH's Food and Nutrition Board categories describe below 12 ng/mL as deficient, 12 to below 20 as generally inadequate, and 20 or more as generally adequate for most healthy people; above 50 may be associated with adverse effects. These are not a universal personal treatment target. NIH Table 1

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Warning: Excess supplement intake can cause high blood calcium and serious harm. The NHS describes potential damage to the kidneys and heart. Follow an individual prescription if you have one; do not use the upper-limit column as permission to take that amount. NHS excessive intake advice

Practical use: Keep the calculator result, your food labels and your supplement labels separate. It reports a reference intake, not how much additional vitamin D you need. If your question concerns treatment or a blood result, take that information to your clinician or pharmacist rather than relying on an age-only output.

Frequently Asked Questions

How do I know if I'm vitamin D deficient?

This calculator cannot answer that. It displays no blood-test interpretation. The 2024 prevention guideline does not recommend routine testing in otherwise healthy people and does not identify universal blood targets for disease prevention. An established clinical indication is a different question. Endocrine Society summary

How much vitamin D should I take daily?

Read the US intake table as a reference for the total, not as an instruction to add a supplement. The result changes with age only. It does not incorporate a prescription, a medical condition, your diet or your current supplement. Discuss those details when asking about a personal dose. NIH consumer guidance

Can I get enough vitamin D from food?

Review the food-source table and the actual labels on foods you use. In the UK, NHS guidance says food alone can make meeting vitamin D needs difficult and advises considering a 400 IU supplement during autumn and winter. That is regional guidance, not a claim that everyone everywhere needs the same supplement. NHS seasonal advice

Sources

NIH Office of Dietary Supplements: Vitamin D, Health Professional Fact Sheet, Tables 1–3 and sun exposure discussion.
NIH Office of Dietary Supplements: Vitamin D, Consumer Fact Sheet, recommended amounts and upper limits.
Endocrine Society: 2024 prevention guideline summary.
NHS: Vitamin D, UK advice. Sources accessed October 4–5, 2026.

Vitamin D Daily Intake Reference

How Much Vitamin D Do You Need?

Vitamin D Sources

Frequently Asked Questions

Sources

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