Why is the most common ruler length 30cm, is there a reason for this?

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Why is the most common ruler length 30cm, is there a reason for this?

In: Mathematics
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30 cm is almost 12 inches, which is 1 foot.

Imperial units are corrupting your ruler sizes. As an american, I apologize.

30cm is approximately 1 foot, which happens to be good tradeoff between a ruler that is easy to carry/use while still being long enough to be useful in a wide variety of situations

Because it’s about 12 inches, or 1 foot. That’s a useful length for measuring small things you can hold in your hand.

The foot thing, but also standard paper is 216 x 280mm, so it can comfortably span the page without being unwieldy.

Because America.

Uh…well, I mean they didn’t wanna give up their foot and inches. So they made a compromise.

Other countries, UK probably:”hey why can’t you use our metric system? Everyone’s using it but you guys.”

America:”cause we don’t want to :)”

“Please? How we gonna communicate if you guys are using foots and inches? What’s a foot or inches even?”

“Okay fine….we’ll use your damn metric systems. But we’ll still keep our foots and inches.”

And thus…the rulers with centimeters.