Vitamin D & Sun Exposure Calculator

Find out exactly how many minutes of sun you need to produce 1,000 IU of vitamin D based on your skin type, location, and season.

Skin Type (Fitzpatrick Scale)

Type II — Fair, usually burns, sometimes tans

Latitude (° N/S)

° North

Month

Time of Day

Clothing Coverage

Sunscreen (SPF)

Current Vitamin D Level (optional)

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Results

Minutes Needed

10min

to produce 1,000 IU

Produced in 30 min

2877IU

with current conditions

Supplementation Recommendation

Current conditions support adequate vitamin D synthesis through sun exposure

Seasonal UV-B Availability

UV-B potential at solar noon throughout the year for your latitude.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

High (≥ 3)

Medium (1–3)

No synthesis (< 1)

Disclaimer: This calculator provides estimates for educational purposes only and is not medical advice. Vitamin D synthesis depends on many individual factors. Consult your doctor before starting supplementation, especially if you are deficient or have underlying health conditions.

Vitamin D Calculator: How Much Sun Do You Really Need? →

How much sun for vitamin D? Skin type, latitude, season — all explained. With free vitamin D calculator.