What is A4 size in cm?

Surely A4 paper is the most widely used paper size of all. In Europe and Japan at least. Because outside Europe they use inches or other sizes. I bet you have seen, used and/or scribbled at least 1 sheet of this paper today: A4 paper. On this page we answer the following question: What is A4 size in cm? Look here if you want to know what the A4 size in mm or the A4 size in inches.

The most commonly used paper size of all. In Europe and Japan at least. Because outside Japan they use a different size: the US Letter. The Letter is slightly wider and shorter in size than the A4 size. But what are the dimensions of A4 size in cm? You can read it below.

Dimensions A4 size in cm


An A4 size in cm has a width of 29,7 cm and a length of 21 cm.

The dimensions of A4 size are very user friendly and handy. A4 paper can be used for many different things. It is the printing paper you find in most printers. What you write your letters on -or print them on. A4 paper is also used for brochures, posters, menus, magazines and calendars.

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A4 size centimeters

The weight of A4 size paper

When ordering printed matter, you are often asked how many grams of paper you want the calendar, menu or brochure printed on. Quite a tricky question. That’s why it’s good to know that in most cases the weight also determines the thickness of the paper. The heavier the number of grams, the thicker the paper often is. And the more luxurious the appearance of your product.

For printing paper we actually always use 80 grams A4 paper. This does not mean that an A4 paper weighs 80 grams. The name is derived from how much 1 m² of paper (A0 size paper) weighs. An 80 gram A4 paper weighs 5 grams.

What does the 4 stand for in A4 paper?

The 4 from the size represents the number of times the A0 sizef is halved. So an A4 size fits 4 times in the A0 size (which has a surface area of 1m²).

Overview of the A-Series in centimetres

Size Centimeter
4A0 168.2 x 237.8
2A0 118.9 x 168.2
A0 84.1 x 118.9
A1 59.4 x 84.1
A2 42.0 x 59.4
A3 29.7 x 42.0
A4 21.0 x 29.7
A5 14.8 x 21.0
A6 10.5 x 14.8
A7 7.4 x 10.5
A8 5.2 x 7.4
A9 3.7 x 5.2
A10 2.6 x 3.7