A4 size - a4 paper size in cm, inches, pixels and mm

A4 paper size in different values.

A4 size in different values. The links below give you an overview. You will find the exact numbers for Micrometres (μm), Millimetres (mm), Centimetres (cm), Metres (m), Thou (th), Inches (in), Feet (ft), Yards (yd), Pixels, Pica, Point and HPGL. Click on the link to go to the appropriate size. You can calculate your A paper size in another unit with our calculator.

A4-size in cm, pixels, mm en inches.

The A4 size is a commonly used paper size for writing paper, stationery, cards and documents. The size A4 reflects the size of a single sheet of paper.

There are different standards for the sizes of paper. A4 size is part of the A standard. The A standard is the international standard. The A standard is part of the “A”, “B” and “C” series of paper sizes of the ISO 216. The ISO 216 is the international standard for a sheet of paper. North America and parts of Central and South America use other paper sizes such as “Letter” and “Legal”.

a4 size vs letter — *The ISO A4 size is used in large parts of the world (yellow color). In the blue parts the US standard “Letter” is used.*

Proportions of the A4 size compared to other sizes.

An A4 has a surface area of 210 x 297 millimetres. In inches, this is 8.27 x 11.69 inches. An A4 paper fits in a C4 envelope without having to fold the paper. When you fold an A4 paper, it works in a C5 envelope.

With the A series of paper sizes, the next size is twice as large or small. The ratio of the A-standard between the long and short side is 2:1. If you fold a sheet of paper horizontally into two equal pieces, two pieces with the same ratio are created. An A4 is half the size of an A3. When you fold an A4, you have twice an A5.

ISO 216 paper sizes — *Size table with the proportions of the ISO A series.*

A sizes in mm and inches.

Size	Millimeter	Inches
4A0	1682 x 2378	66.220 x 93.622
2A0	1189 x 1682	46.811 x 66.220
A0	841 x 1189	33.110 x 46.811
A1	594 x 841	23.386 x 33.110
A2	420 x 594	16.535 x 23.386
A3	297 x 420	11.693 x 16.535
A4	210 x 297	8.268 x 11.693
A5	148 x 210	5.827 x 8.268
A6	105 x 148	4.134 x 5.827
A7	74 x 105	2.913 x 4.134
A8	52 x 74	2.047 x 2.913
A9	37 x 52	1.457 x 2.047
A10	26 x 37	1.024 x 1.457

ISO standard A, B and C series.

Finally, in addition to the A sizes, the ISO 216 standard includes B and C paper sizes. The B-series paper sizes and the C-series paper sizes are made to cover paper sizes that do not fall under the A-series.

A4-size.com loves paper.

Do you also want to have fun with A4 paper? Then fold an airplane and see how far it flies!