Sunscreen Calculator
Calculate how much sunscreen you need for safe sun protection based on your body size and trip duration
Calculate Sunscreen Requirements
Common sizes: 150ml (5 oz), 200ml (6.8 oz), 300ml (10 oz)
Sunscreen Requirements
Calculation Details
Protection area: 0 cm²
Application rate: 2 mg/cm² (WHO standard)
Per application: NaN ml
Trip duration: 7 days
Daily sun exposure: 4 hours
Reapplication: Every 2 hours
☀️ Sun Protection Tips
• Apply sunscreen 30 minutes before sun exposure
• Use SPF 30 or higher with broad-spectrum protection
• Don't forget ears, neck, feet, and lips
• Reapply after swimming, sweating, or toweling off
• Seek shade during peak hours (10 AM - 4 PM)
• Wear protective clothing and sunglasses
Example: Beach Vacation
Scenario
Person: 70kg, 175cm adult
Trip: 7-day beach vacation
Sun exposure: 6 hours daily
Clothing: Swimwear
Reapplication: Every 2 hours
Results
Body area exposed: ~14,000 cm²
Per application: ~28 ml
Daily applications: 4 times
Daily amount: ~112 ml
Total needed: ~784 ml
200ml bottles needed: 4 bottles
SPF Protection Guide
SPF 15
Blocks ~93% of UVB rays
Minimum protection
SPF 30
Blocks ~97% of UVB rays
Recommended minimum
SPF 50+
Blocks ~98% of UVB rays
High protection
Application Guidelines
Use 2 mg per cm² of exposed skin
Apply 30 minutes before sun exposure
Reapply every 2 hours or after swimming
Use water-resistant formulas for activities
Choose broad-spectrum protection
Understanding Sunscreen Requirements
Why Use This Calculator?
Most people apply only 25-50% of the recommended amount of sunscreen, significantly reducing protection. This calculator helps you determine exactly how much sunscreen you need for proper protection based on scientific recommendations.
Health Importance
- •Prevents sunburn and premature skin aging
- •Reduces skin cancer risk by up to 40%
- •Protects against UV-induced DNA damage
- •Maintains healthy skin appearance
Calculation Method
Standard Application Rate: 2 mg/cm²
Body Surface Area: DuBois formula
Face Area: Elliptical approximation
UV Radiation Facts
- UVA (320-400nm): Penetrates deep, causes aging
- UVB (280-320nm): Causes burns, blocked by epidermis
- UVC (100-280nm): Blocked by ozone layer
Important: Choose broad-spectrum sunscreens that protect against both UVA and UVB radiation.