Sunscreen Timer Calculator

Calculate when to reapply sunscreen based on SPF and UV index.

Conditions

Skin Sensitivity

Sunscreen SPF

Activity Level

Protection Time

Reapply Every120 minStandard 2hr Limit Applied

Theoretical Burn Protection10.0 hours

Note: Even if calculated protection is longer, dermatologists insist on reapplying every 2 hours or immediately after swimming/toweling.

Overview

Sunscreen timer calculates reapplication time based on SPF, UV index, and skin type. Essential for sun protection and skin cancer prevention.

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Pro Tips

SPF 30: 30× longer than no protection.
Reapply every 2 hours regardless of SPF.
Water reduces effectiveness; reapply after swimming.
UV index 6+: limit midday sun exposure.

Fun Facts

"Fair skin burns in 10-15 minutes unprotected."
"SPF 30 blocks 97% UVB; SPF 50 blocks 98%."
"Skin cancer: 1 in 5 Americans by age 70."
"Clouds block only 20% of UV rays."

Formula: Protection Time = SPF × Minutes to Burn; Reapply every 2 hours

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