What is the size of A4 paper in inches?

A4 paper measures 8.27 × 11.69 inches.

How do A4 and Letter sizes compare?

A4 is 210×297 mm; Letter is 216×279 mm. A4 is narrower but longer.

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📐 Standard Paper Sizes Guide

The ISO 216 standard defines A, B, and C series. A4 (210×297 mm) is the international standard for documents. North American sizes include Letter (8.5×11 in), Legal (8.5×14 in), and Tabloid (11×17 in). Use our tool to compare, convert, and understand paper dimensions.

❓ Frequently Asked Questions

What's the difference between A4 and Letter?

A4 is 210×297 mm (8.27×11.69 in), while Letter is 216×279 mm (8.5×11 in). A4 is narrower and longer; Letter is wider and shorter.

How does the A series scale?

Each size is half the area of the previous: A1 is half of A0, A2 half of A1, etc. Aspect ratio remains √2:1.

What are B and C series used for?

B series provides intermediate sizes for posters, books. C series is for envelopes (e.g., C4 fits A4).

What size is Legal?

8.5 × 14 inches (216 × 356 mm).

Can I use this offline?

Yes, the entire tool runs in your browser without internet.