SPF Calculator
Calculate exactly how much sunscreen you need based on your skin type, UV index, and outdoor activity. Get personalized SPF recommendations and reapplication reminders.
Understanding the UV Index
- 1–2 (Low): Minimal protection required. Wear sunglasses on bright days.
- 3–5 (Moderate): SPF 15–30 recommended. Seek shade during midday.
- 6–7 (High): SPF 30–50. Reduce outdoor exposure 10am–4pm.
- 8–10 (Very High): SPF 50+. Protective clothing and wide-brim hat essential.
- 11+ (Extreme): Avoid being outside during midday. Full protective gear required.
Frequently Asked Questions
How much sunscreen should I apply to my face?
For your face and neck alone, you need approximately ¼ teaspoon (1.25 ml) or 2–3 grams of sunscreen. Most people apply only 25–50% of the recommended amount, which dramatically reduces protection.
Do I need sunscreen on cloudy days?
Yes. Up to 80% of UV rays penetrate through clouds. UVA rays (which cause premature aging) are present all year round, regardless of weather.
What does SPF 50 mean compared to SPF 30?
SPF 30 blocks about 97% of UVB rays, while SPF 50 blocks about 98%. The difference is marginal — what matters more is applying enough product and reapplying every 2 hours.