ALL PAPER SIZES

A5, A4, and A3 paper dimensions in centimeters are as follows:

• A5: 14.8 × 21.0 cm
• A4: 21.0 × 29.7 cm
• A3: 29.7 × 42.0 cm 

These are standard ISO 216 international paper sizes. 

Every larger size is made by folding the previous size in half, 

so an A4 is exactly two A5 sheets side-by-side, 

and an A3 is exactly two A4 sheets side-by-side. 

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• https://www.papersizes.org/a-paper-sizes.htm
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• https://www.neenahpaper.com/resources/paper-101/international-sizes
• https://papersizes.io/a

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School notebook sizes vary by grade and region, but the most common standard sizes in India are Short (24 × 18 cm), Jumbo (24 × 18 cm or 28 × 18 cm), and Long/A4 (29.7 × 21 cm). Elementary students often use smaller sizes like 19.0 × 15.5 cm for easier handling

The most widely used notebook dimensions include:

Standard / Short Note Books: Typically 24 × 18 cm (or 9.5 × 7 inches).
Jumbo Notebooks: Usually around 18 × 24 cm or 28 × 18 cm.
A4 / Long Notebooks: 29.7 × 21 cm (or 11.7 × 8.3 inches).
Compact / Pocket: 19.0 × 15.5 cm to 15.5 × 19 cm (common for primary schools). 
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