Vitamin D Intake Calculator

Estimate your recommended daily Vitamin D intake based on age, weight, and sunlight exposure. This tool supports metric and US units, runs completely offline, and is designed to help you prepare for conversations with your healthcare provider.

Note: For informational and educational purposes only. This is not medical advice.

Calculate Your Intake

Measurement Units

Age (years)

Enter your age (1-120)

Weight (kg)

Example: 70 or 70.5 or 70,5

Skin Type / Sun Sensitivity

Typical Daily Sun Exposure

Calculation Method

Different guidelines suggest different intake levels.

Estimated Daily Intake

Recommended Daily Intake: -

Understanding Vitamin D Intake

Vitamin D is essential for bone health, immune function, and overall wellness. It can be obtained from sun exposure, food, and supplements. However, many people don't get enough due to indoor lifestyles, geography, or skin type.

How This Calculator Works

It estimates baseline needs based on age and weight.
Adjusts for skin type (darker skin produces less Vitamin D from sun).
Accounts for your typical sun exposure.
Applies selected guideline (e.g., Endocrine Society often recommends higher intakes than IOM).

Realistic Examples

Scenario	Estimated Daily Need	Notes
40-year-old, 70 kg, fair skin, low sun	1,500–2,000 IU	Common for office workers in northern climates.
65-year-old, 80 kg, dark skin, minimal sun	2,000–3,000 IU	Age and reduced skin efficiency increase needs.
25-year-old, 60 kg, olive skin, high sun	600–800 IU	Adequate sun exposure significantly reduces supplemental need.

Typical Vitamin D Ranges (Serum 25(OH)D)

Status	ng/mL	nmol/L	General Guidance
Deficient	< 12	< 30	Requires intervention; discuss with clinician.
Insufficient	12–20	30–50	Consider increased intake/sun.
Sufficient	20–50	50–125	Adequate for most people.

Vitamin D Intake Calculator

Calculate Your Intake

Estimated Daily Intake

Understanding Vitamin D Intake

How This Calculator Works

Realistic Examples

Typical Vitamin D Ranges (Serum 25(OH)D)

Sun Exposure Adjuster

Frequently Asked Questions

How accurate is this calculator?

Should I take the higher dose from the Endocrine Society?

Can I get too much Vitamin D from supplements?

When should I seek professional help?

Formulas & Assumptions

Sources & References

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Vitamin D Intake Calculator

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