Photoprotection Lab
Sunscreen Dosage & UV Timer Calculator
Calculate the exact amount of SPF needed to achieve true lab-tested protection, and get a customized reapplication countdown for your day.
Configure Your Daily Sun Exposure
Two-Finger Rule
Squeeze two solid lines of sunscreen along the full length of your index and middle fingers. This covers the average adult facial surface area (approx. 2 mg/cm²).
Reapplication Over Makeup
Do not wipe your makeup. Use an SPF 50 fine mist spray or a cushion compact with broad-spectrum PA++++ for quick midday touch-ups without smudging.
Don't Forget Ears & Lips
80% of missed UV burns occur on the top of ears, eyelids, and lips. Always use a dedicated SPF 30+ lip balm before outdoor exposure.
Cosmetic Educational Disclaimer: This sunscreen dosage tool is provided for general photoprotection and cosmetic awareness. It does not replace medical advice regarding sun allergies, photodermatitis, or skin cancer prevention. Always follow label directions and seek medical evaluation for abnormal skin changes.