Sun Exposure & SPF Calculator
Estimated time to burn with and without sunscreen.
Your result
Estimates assume no reapplication; reapply every two hours. Seek shade between 10am and 4pm and never use sunscreen to extend time in strong sun.
Medical disclaimer: This tool is for education and is not medical advice. Read more.
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Frequently asked questions
What does the Sun Exposure & SPF Calculator do?
Estimated time to burn with and without sunscreen. Enter your values and the result and chart update instantly.
How accurate is it?
It uses published, widely used formulas. Results are estimates for education and planning, not a diagnosis. Talk to a qualified clinician about decisions affecting your health.
Is my information stored or shared?
No. All calculations run in your browser and nothing you type is sent to a server or saved.
What can I search to find this tool?
People find it by searching for: how long can i stay in the sun; spf needed; avoid sunburn; uv index safe time.