UV Index Calculator
Free UV index calculator. Estimate safe sun exposure time, sunburn risk, and SPF recommendations based on UV index and your Fitzpatrick skin type.
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Calculate Your Safe Sun Exposure Time
The UV Index measures the strength of ultraviolet radiation from the sun. Our calculator uses the WHO/WMO standard UV index scale and Fitzpatrick skin type classification to estimate how long you can safely stay in the sun without protection, and what SPF level you need.
What Is the UV Index?
The UV Index is an international standard measurement developed by the WHO and WMO. It ranges from 0 (nighttime) to 11+ (extreme). The scale is linear - UV Index 10 is twice as intense as UV Index 5. Higher values mean faster potential for sunburn and skin damage.
Time to Burn Formula
t = (MED × 16.67) / UV IndexWhy Use a UV Index Calculator?
Prevent Sunburn
Know exactly how long you can stay outside before risking skin damage.
Optimize Vitamin D
Get enough sun for vitamin D production without overexposure.
Choose Right SPF
Select appropriate sunscreen protection for current UV conditions.
How to Use This Calculator
Common Applications
Beach Days
Plan sun exposure at the beach where reflection can increase UV by 50%.
Skiing & Hiking
Account for altitude and snow reflection in mountain environments.
Outdoor Sports
Athletes can time training to avoid peak UV hours.
Travel Planning
Prepare for different UV levels in tropical or high-altitude destinations.
Frequently Asked Questions
At UV Index 0-2 (Low), most people can safely stay outside with minimal protection. At UV Index 3+ (Moderate and above), sunscreen, hats, and protective clothing are recommended, especially for fair-skinned individuals.