Tools
Paper sizes
Paper sizes and dimensions
Dimensions of A, B, C, US and other paper formats in millimetres, inches and pixels.
Common
Common sizes for quick access.
ISO A series
International standard sizes with a 1:√2 aspect ratio.
ISO B series
Geometric mean between A series sizes.
ISO C series
Envelope sizes: geometric mean between A and B.
RA series
Raw format sizes for printing before trimming.
SRA series
Supplementary raw format A, with extra bleed area.
US classic
North American office and press standards.
US ANSI
American National Standards Institute sizes.
US architectural
American architectural drawing standards.
Japanese JIS
Japanese Industrial Standard paper sizes.
Chinese
Chinese national standard paper sizes.
Swedish SIS
Swedish standard paper sizes.
French traditional
Traditional French paper sizes.
Imperial
Traditional British Imperial paper sizes.
About this tool
Here you will find the dimensions of more than a hundred paper formats grouped by standard: ISO A, B and C series, RA and SRA raw formats, US office sizes (Letter, Legal, Tabloid), ANSI, architectural drawing sizes, Japanese JIS, Chinese, Swedish, traditional French and British Imperial. It helps when you set up a print file, choose an envelope or need to know what paper an overseas client is asking for.
Switch between millimetres and inches with the “Unit” toggle. Click two sizes in the list to compare them “Side by side” or as an “Overlay”. In the search box you can type a name (A5), dimensions (210x297mm, 8.5x11in) or pixels with a resolution (1920x1080@300dpi) to see the five closest formats. “Upload” detects the size of an image or of the first page of a PDF.
Images and PDFs are read in your browser and never uploaded to a server. Dimensions are the nominal values of each standard; real paper can vary by a millimetre depending on the mill. If you type dimensions without a unit and both are under 50, they are read as inches. The tool does not resize or convert files; it only tells you which format fits.
How do I use the paper sizes chart?
- Choose your unit with the “Unit” selector: millimetres or inches.
- Search for a format by name (A5), by dimensions (148x210mm, 8.5x11in) or by pixels and resolution (2480x3508@300dpi); you will see the five closest matches.
- Click two formats in the list to compare them side by side or overlaid.
- If you have a file, use “Upload” so the tool detects the size of the image or of the first page of the PDF.
How do A paper sizes work?
The A series of the ISO 216 standard starts with A0, a sheet of one square metre, and each following size is half the previous one: folding an A0 in half gives an A1, an A1 gives an A2, and so on down to A10. Every sheet has the same proportion, 1 to the square root of 2 (about 1:1.414), so a design can be scaled from one size to another without distortion or extra margins.
The most common are A4 (210 × 297 mm) for documents and letters, A5 (148 × 210 mm) for leaflets and notebooks, A3 (297 × 420 mm) for small posters and plans, and A6 (105 × 148 mm) for postcards.
B and C series, envelopes and US sizes
The B series has sizes between those of the A series and is used, for example, for posters and books. The C series is designed for envelopes: a C4 envelope takes an unfolded A4, a C5 an A4 folded once (an A5) and a C6 an A4 folded twice (an A6). The DL envelope (110 × 220 mm) is the classic one for an A4 folded into thirds.
The United States and Canada use other formats: Letter (8.5 × 11 inches, 215.9 × 279.4 mm) instead of A4, and Legal (8.5 × 14 inches) for legal documents. Letter is slightly wider and shorter than A4, which is why a document laid out for one goes out of alignment when printed on the other: if you work with clients there, check which paper they will print on.
Pixels and resolution for print
To find out how many pixels an image needs, multiply the format's size in inches by the resolution. An A4 at 300 dpi, the usual resolution for professional print, is 2480 × 3508 pixels; at 150 dpi, half on each side. You can type your image's pixels and resolution in the search box to see which format it matches.
If the file is going to a print shop, ask whether it needs bleed: a few extra millimetres on each side that are trimmed afterwards so the colour reaches the edge. The tool gives the nominal size of each format, without bleed.
Frequently asked questions
What size is A4?
A4 is 210 × 297 mm, or roughly 8.27 × 11.69 inches. It is the standard sheet size in the UK and most of the world outside North America.
What is the difference between A4 and US Letter?
US Letter is 8.5 × 11 inches (216 × 279 mm), about 6 mm wider and 18 mm shorter than A4. Printing a document set up for one on the other can clip the margins.
How many pixels is A4 at 300 dpi?
At 300 dpi an A4 page is about 2480 × 3508 pixels. You can check other resolutions by typing your pixel size and dpi into the search box.
What are SRA paper sizes for?
SRA sheets are slightly larger than the A series so you can print with bleed and trim afterwards. For example, an SRA3 sheet (320 × 450 mm) gives you a full-bleed A3.