A3 paper is a versatile size that’s larger than standard letter paper but smaller than A2. You’ve probably seen it used for posters, flyers, and even restaurant menus. This article will break down everything you need to know about what is the size of A3 paper, including its dimensions and common uses.
A3 paper size, like all “A” sizes, follows the ISO 216 standard, which we’ll also discuss.
A3 Paper Dimensions in Various Units
When you’re working with A3 paper, it helps to know its dimensions in different units of measurement. Here’s a handy guide:
- Millimeters: 297 x 420 mm
- Centimeters: 29.7 x 42 cm
- Inches: 11.69 x 16.54 inches
You might also see paper sizes expressed in pixels, picas, or points, particularly when dealing with digital design and printing. These units are important in the world of graphic design, but for most everyday purposes, millimeters, centimeters, and inches are the most useful.
The ISO 216 standard and the A series
When we talk about A3 paper size, we’re talking about a specific size within the ISO 216 international standard, which governs paper sizes around the world. The purpose of ISO 216 is to create a standardized system that allows for easy and efficient scaling and reproduction of documents.
The A series family
The A series includes a range of paper sizes, from A0 (the largest) all the way down to A10 (the smallest). Each size is mathematically related to the others. For example, an A2 sheet of paper is half the size of an A1 sheet, and an A4 sheet is half the size of an A3 sheet. If you double the area of an A3 sheet, you’ll get an A2 sheet.
No matter the size, all A-series paper has a constant ratio between its long and short sides: √2:1, or roughly 1.414.
The B and C series
In addition to the A series, there are also B and C series paper sizes. These are complementary sizes that cover needs not met by the A series. For instance, the B series is often used for posters, while the C series is commonly used for envelopes.
How does A3 compare to other paper sizes?
A3 paper is part of a series of paper sizes, from A0 (the largest) to A10 (the smallest). Here’s how A3 stacks up against some other common sizes:
- A3 vs. A4: A3 is twice the size of A4. You could fit two A4 sheets perfectly onto one A3 sheet.
- A3 vs. A2: A2 is twice the size of A3. An A3 sheet is half the size of A2.
- A3 vs. A1 and A0: A1 is twice the size of A2. A0 is twice the size of A1, making it four times the size of A3.
Closing Thoughts
A3 paper measures 297 x 420 millimeters, or 29.7 x 42.0 centimeters, or 11.7 x 16.5 inches. This size is part of the ISO 216 standard, which helps ensure consistency across paper sizes. Because of its dimensions, A3 paper is a versatile choice for posters, presentations, and other projects.