Blink-free Photo Calculator
Find the chance everyone has their eyes open in a group photo.
The more people in a photo, the more likely someone blinks.
How the Math Works
The Blink-free Photo Calculator uses the formula P = (1 - blink)^people to determine the probability that everyone will have their eyes open in a group photo. Here, 'blink' represents the probability of an individual blinking at the exact moment the photo is taken, while 'people' is the total number of individuals in the group. The calculation first finds the chance of one person keeping their eyes open by subtracting the blink probability from 1, then raises this value to the power of the number of people to account for all independent participants.
Practical Applications
To use this calculator practically, first estimate the blink probability for your group - typically around 0.2 to 0.4 for most people during normal conversation. Enter this value along with the number of people in your group photo. The calculator will output the percentage chance everyone keeps their eyes open simultaneously, helping you decide how many attempts you might need to get a perfect shot.
Day-to-Day Use
This calculator helps transform frustrating photo sessions into successful memories. Instead of endless 'one more try' moments, you can plan ahead by understanding your group's blink probability. Professional photographers use similar calculations, and now you can apply this knowledge to family gatherings, school photos, or corporate events where getting everyone's eyes open matters for lasting memories.
Worked example
10 people at 4% blink chance gives about 66% per shot.
FAQ
How many photos should I take?
Roughly 1 / (chance per shot) to be reasonably sure of one good frame.