Sunscreen Safe Exposure Time Calculator
Enter your skin type, SPF, and UV index to see how many minutes you can safely stay in the sun today and when to reapply.
🧑 Select skin type
Pick based on how your skin reacts to first sun exposure.
🧴 SPF value
☀️ UV Index
Enter today's UV index from your weather app. If unknown, use 7–8 for a summer midday.
💦 Activity
Heavy sweating or water shortens the reapplication interval.
⏱️ Safe exposure time
Safe exposure time without burning
7h 9m
Apply now → safe until 06:14
⚠️ Without sunscreen: burn risk in 14m
Next reapply at 01:05
Current UV
7 · High
Your base time
20m
Applied SPF
SPF 30
Safe time is an estimate. UV exists even on cloudy days; move to shade immediately if your skin reddens before the shown time.
🎯 SPF by situation
Window UVA, light daily use
Short outdoor time, walking
Long sun, hiking, exercise
Waterproof, reapply often
Basis & sources
- 🔥 Skin-type burn time (MED): Fitzpatrick (1988) and Korean Dermatological Association UV guidance
- ☀️ UV index bands: WHO/WMO Global Solar UV Index · Korea Meteorological Administration
- 🧴 SPF/PA definition: US FDA Sunscreen Final Rule · Korea MFDS functional cosmetics standard
- 🔁 Reapplication: FDA every 2 hours, every 1 hour with sweat/water
※ All values are reference estimates and skin response varies by individual. Consult a dermatologist for sensitive skin or skin conditions.
Guide · FAQ · bal.pe.kr 도구 모음
SPF·PA 원리와 계산 공식은 Guide, 자주 묻는 질문은 FAQ, 데이터 출처·운영 정보는 About 참조. 마지막 업데이트 2026-07-05.