How many breaths do you take in a year?

Question

Solve in your head. Roughly how many breaths does a person take in a year? An order-of-magnitude estimate is fine. Aim: under 30 seconds.

Accepted Answer

This is a Fermi estimate: pick a reasonable rate and multiply by the time. Rate. A person at rest breathes roughly 12 to 16 times per minute. Take \sim 14 breaths/min as a round middle value (or 12 for a cleaner number). Time. Minutes in a year: 60 	imes 24 	imes 365 = 525{,}600, call it \sim 5.3 	imes 10^5 minutes. Multiply. With 12 breaths/min: 12 	imes 525{,}600 = 6{,}307{,}200 \approx 6.3 	ext{ million breaths.} With 14/min you get about 7.4 million, and with 16/min about 8.4 million. So the honest answer is roughly 6 to 8 million breaths per year, order of magnitude 10^7. The precis…

How many breaths do you take in a year?

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