Sunscreen Calculator – Calculate How Much SPF to Use

Select the area you want to protect. We estimate how much broad-spectrum sunscreen to apply using the standard 2 mg/cm² dose, with practical teaspoon and finger-length guidance.

• For face coverage, many dermatologists cite ~1/4 teaspoon or two finger-lengths of product.
• Apply as the last skincare step in the morning, before makeup.
• Reapply every 2 hours outdoors, and after swimming or heavy sweating.
• Most people under-apply — using enough product matters as much as SPF number.