This document provides the dimensions of A3 paper size in millimetres, centimetres, inches, and pixels. A3 paper measures 297mm by 420mm, 29.7cm by 42cm, 11.7 inches by 16.5 inches, and 3508 pixels by 4962 pixels at 300 pixels per inch. It also notes that A3 size is similar to US ledger paper.

1. 279 mm
297 mm
A3 size
A3 Paper Size in Millimetres
420 mm
432 mm
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Ledger

2. 27.9 cm
29.7 cm
A3 size
A3 Paper Size in Centimetres
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43.2 cm
42 cm
Ledger

3. 11 inches
11.7 inches
A3 size
A3 Paper Size in Inches
16.5 inches
17 inches
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Ledger

4. 3300 pixel
3508 pixel
Pixels Per Inch: 300 PPI
A3 size
A3 Paper Size in Inches
4962 pixel
5100 pixel
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Ledger