Using enough sunscreen? The two-finger trick

Most people put on a quarter to half of what the SPF test uses. Getting it right takes just two fingers and about a minute, so here’s how much your face and body need, and when to top up.

Nubia3 min read

Two parallel lines of white sunscreen sit on a sunlit pale stone slab.

The catch with the SPF on the bottle

The SPF on a bottle comes from a lab test that uses a thick, even layer: 2 milligrams for every square centimeter of skin. In real life, most people put on a quarter to half of that, and a thinner layer gives you less protection than the number on the label. So how much you use matters as much as which SPF you pick.

Your morning sunscreen

  1. Moisturizer first, if you use one

    Let it sink in for a minute.

  2. Two finger-lengths for your face

    Squeeze a line along your index and middle fingers, dot it over your face, then spread.

  3. A little more for neck and ears

    They’re easy to miss, and they get a lot of sun.

  4. Give it about 15 minutes

    Put it on before you head out, not once you’re already in the sun.

Beach day? Here’s your body amount

For a day in a swimsuit, an adult body needs about a shot glass of sunscreen, which is 6 to 8 teaspoons. When you’re outside for a while, top up every 2 hours, and straight after swimming, sweating or towel drying. A sunscreen stick makes face top-ups quicker when you’re out.

Common questions

Does makeup with SPF count?

It’s a bonus, but most of us don’t wear nearly enough makeup to get the SPF on the label. Keep your sunscreen underneath and count makeup SPF as extra.

Can a higher SPF make up for using less?

A higher number helps a little when your layer comes out thin, but it doesn’t last any longer. Every SPF needs a top-up after 2 hours outside.

Sources

  1. How to apply sunscreenAmerican Academy of Dermatology, accessed October 18, 2026
  2. Sunscreen FAQsAmerican Academy of Dermatology, accessed October 18, 2026
  3. Sunscreen and sun safetyNHS, accessed October 18, 2026
  4. Application of sunscreen: theory and realityPhotodermatology, Photoimmunology & Photomedicine (Petersen B, Wulf HC), accessed October 18, 2026

Reviewed for content and safety by Nubia editorial team. Next review: January 2027.

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