🎉 Shared birthday (23 people) vs 🦈 Dying in a shark attack
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You're 1.9 million× more likely to share a birthday in a group of 23
than to die in a shark attack
Periods differ: Shared birthday (23 people) is framed as group of 23 people, while Dying in a shark attack is lifetime (US). The multiplier is a raw ratio of the 1-in-X figures — not a normalized lifetime risk. Compare cautiously.
Shared birthday (23 people)
~50.7% (about 1 in 2)
group of 23 people
Dying in a shark attack
1 in 3,748,067
lifetime (US)
How we calculated this
Each figure is “1 in X.” The larger X is the rarer event. Dividing that number by the more common one gives the multiplier: you're 1.9 million× more likely to share a birthday in a group of 23. When the periods differ, this is a raw ratio of those figures, not a lifetime-normalized risk.
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You're 1.9 million× more likely to share a birthday in a group of 23 (~50.7% (about 1 in 2), group of 23 people) than to die in a shark attack (1 in 3,748,067, lifetime (US)). ⚠️ Periods differ (group of 23 people vs lifetime (US)) — compare cautiously. — How Likely Is That? https://www.howlikelyisthat.com/compare/birthday-paradox-odds-vs-odds-of-dying-in-a-shark-attack
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