Beauty & skin
Sunscreen Amount Calculator
SPF is tested at 2 mg of product per cm² of skin — far more than most of us use. Here is what that looks like for the areas you are covering.
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How this is worked out
We use the 2 mg/cm² test dose and typical adult surface areas: face ≈ 1.2 ml (about ¼ teaspoon, the "two-finger" amount), neck and ears ≈ 0.8 ml, each arm ≈ 3 ml, each leg ≈ 6 ml, torso ≈ 12 ml. Reapply every two hours outdoors, and after swimming, sweating or towelling off.
Questions people ask
Do I need sunscreen indoors?
If you sit by a bright window for hours, yes — UVA passes through glass. Otherwise your morning application is usually enough indoors.