All Fermi answers
Fermi #19 · Question 1

How many fast food ketchup packets does it take to fill a classic glass Heinz bottle?

Explore the official answer and the simple reasoning behind this Fermi estimate.

1QUESTION 1 OF 3

Answer & explanation

The official answer, with Fermi’s reasoning step by step.

Answer & explanation

Official answer

44

packets

How to estimate it

Fermi’s official “Napkin math”

A ketchup packet is a barely-there squirt, maybe a third of an ounce. The classic glass bottle is 14 ounces. So how many squirts is that?

Glass bottle
14 oz
One packet
÷ 0.3 oz
14 ÷ 0.3
≈ 47

Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.

Source calculation & reference
Heinz glass bottle
= 14 oz = 397 g
Heinz foodservice portion packet
= 9 g
397 ÷ 9
≈ 44 packets

Reference cited by Fermi: Heinz foodservice portion packet spec and glass bottle spec

How close was your guess?

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Compare by ratio: divide the larger number by the smaller one. The closer to 1×, the better.

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