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Time-to-Burn Calculator

Estimate how long you can stay in the sun before your skin starts to burn, given the UV index, your skin type and the surface around you.

UV index: 6

Skin type (Fitzpatrick)

Surrounding surface

Estimated time to burn

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Effective UV — · —

Reapply protection and seek shade well before this time.

How this works

Time-to-burn is estimated from the UV index and the Fitzpatrick skin type (how your skin reacts to sun). Reflective surfaces such as snow (up to ~69%), sand and water raise the effective UV you receive, shortening the safe time. This is a guide only — burn times vary with altitude, medication, and prior exposure. When in doubt, cover up and use SPF 30+.