☀️ Sun Exposure Calculator

Estimate your sunburn time, vitamin D production, and UV dose based on your location, skin type, and body exposure — all in real time.

Your Location

ZIP / Postal Code or City Name (e.g. 18042, London, Sydney)

UV Index

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Temperature (context only)

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Temperature is context only — UV drives burn risk.

UV Index is below 3. Lower burn risk, but meaningful vitamin D synthesis is minimal at this level.

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Today's UV Forecast

Solid line: actual UV Index. Dashed line: clear-sky maximum. Powered by Open-Meteo.

Exposure Settings

1. Fitzpatrick Skin Type What is this?

MED (Minimal Erythemal Dose): Type I = 2.0 SED, II = 3.0, III = 4.5, IV = 6.0, V = 8.0, VI = 10.0

2. Body Surface Area Exposed

Rule of Nines

Select individual body regions. Each contributes its fraction of total BSA.

Head & neck 9% Chest (front) 9% Abdomen (front) 9% Upper back 9% Lower back 9% Right arm 9% Left arm 9% Right thigh 10% Left thigh 10% Right lower leg 7% Left lower leg 7%

0% BSA selected

3. Planned Exposure Duration (minutes)

Open Live Timer

Estimated Results

Projected dose exceeds 1 MED. At your chosen duration and current UV Index, sunburn is likely. Seek shade immediately or apply SPF 30+ sunscreen.

Estimated Burn Time

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minutes to first sunburn

Vitamin D Estimate

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IU vitamin D₃ produced

UV Risk Level

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at current UV Index

UV Dose

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for chosen duration

Recommendations

Set your location and exposure settings above to see recommendations.

All estimates use the WHO/ICNIRP UV dose model. Temperature is shown for context only — UV Index drives all calculations. Actual risk varies with clouds, shade, altitude, water/snow/sand reflection, sunscreen, and individual biology. See full methodology →