EPISODE · Dec 4, 2025 · 5 MIN

Why Paper Has Standard Sizes

from Unusual Origins – The Strange Beginnings · host Kimberly Hollins

Episode 7 explains how standardized paper sizes like A4 were created to solve centuries of confusion. The modern ISO system is based on the 1:√2 ratio, allowing each sheet to be cut in half while preserving its proportions. The largest size, A0, has an area of exactly one square meter, and all smaller sizes descend logically from it. Germany introduced this mathematically elegant system in 1922, and it spread worldwide — making A4 the global standard for writing and printing.

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