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Blink-free Photo Calculator

Find the chance everyone has their eyes open in a group photo.

Calculated Output

Chance all eyes open (%) 66.483

Suggested number of shots 2

Formula: P = (1 - blink)^people

Step-by-Step Breakdown

1. Values used:

2. Number of people = 10

3. Blink probability per person = 0.04

5. Chance all eyes open = 66.483%

6. Suggested number of shots = 2

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The math behind it

Chance all eyes are open = (1 - blink probability)^people. Take a few shots to be safe.

10 people at 4% blink chance gives about 66% per shot.

How many photos should I take?

Roughly 1 / (chance per shot) to be reasonably sure of one good frame.