How Much Sunscreen You Actually Need

Use ¼ teaspoon for your face and neck. That is the standard amount used in SPF testing. Using less means getting less protection than the label claims.

Use a full shot glass (30ml) for your whole body. This is the amount tested in labs. Halving it cuts your protection by roughly half.

Sunscreen should not disappear into your skin. It forms a protective film on top. If it vanishes quickly, you are not applying enough.

Expect to go through a bottle every few days at the beach. Most people use half what they need and wonder why they still burn. The alternative is skin damage.