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Paper Sizes Chart

Look up any paper size and convert it to pixels at any DPI

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Scan the reference table to find your paper size in the A series, B series, or US group, with dimensions shown in millimetres, centimetres, and inches.
  2. 2.In the converter, choose a paper size from the dropdown to load its exact dimensions.
  3. 3.Type the resolution you need in the DPI field (300 is standard for print, 72 for screen) to see the pixel width and height instantly.
  4. 4.Read off the pixel result alongside the millimetre, centimetre, and inch values to set up your canvas or export.

About Paper Sizes Chart

A paper size chart puts every standard sheet dimension in one place, so you never have to guess whether A4 is bigger than Letter or how many pixels wide a poster needs to be. This tool pairs a complete reference table with a live converter that turns any standard size into exact pixel dimensions at the resolution you choose. Everything runs locally in your browser, with no uploads and no sign-in.

The international standard for paper is ISO 216, which defines the familiar A and B series used almost everywhere outside North America. Its defining trick is the aspect ratio: every sheet has a height-to-width ratio of the square root of two (about 1.414). Because of that ratio, folding a sheet in half across its longer side produces two sheets of the next size down, each keeping the same proportions. The series is anchored by A0, which has an area of almost exactly one square metre and measures 841 by 1189 millimetres. Halving A0 gives A1 (594 by 841 mm), then A2, A3, and the everyday A4 at 210 by 297 mm, continuing down to A10. The B series (B0 at 1000 by 1414 mm, B1, B2, and so on) sits between the A sizes and is used for posters, books, and envelopes when an in-between dimension is needed.

North America uses its own ANSI and US conventions instead. US Letter is 8.5 by 11 inches (215.9 by 279.4 mm), US Legal is 8.5 by 14 inches (215.9 by 355.6 mm), and Tabloid, also called Ledger, is 11 by 17 inches (279.4 by 431.8 mm). Because these are defined in inches, their millimetre values are exact conversions rather than round numbers, which is why Letter and A4 are close in size but never identical: A4 is a little narrower and a little taller.

Converting between units is straightforward once you fix one constant: one inch equals exactly 25.4 millimetres. From there, millimetres to inches is a division by 25.4, and millimetres to centimetres is a division by ten. The reference table shows all three units side by side for every size so you can copy whichever your workflow expects.

Pixels are different because a physical sheet has no fixed pixel count until you pick a resolution. DPI (dots per inch) bridges the physical and digital worlds: the pixel width equals the width in inches multiplied by the DPI, rounded to a whole pixel. At 300 DPI, the standard for high-quality print, A4 becomes 2480 by 3508 pixels; at 72 DPI, a classic screen value, the same A4 is only 595 by 842 pixels. That is why designers set canvas sizes in pixels but think in paper sizes, and why a print shop asks for 300 DPI artwork.

Designers, print buyers, students, and developers use a chart like this to set up documents, size images for printing, prepare files for cutting or binding, and sanity-check export dimensions before sending anything to a printer.

Methodology & sources

Dimensions use published standards: ISO 216 for the A and B series and ANSI/US for Letter, Legal and Tabloid. Conversions use 1 inch = 25.4 mm exactly, so mm to inch = mm / 25.4, mm to cm = mm / 10, and mm to pixels at a resolution = round(mm / 25.4 x DPI).

Frequently asked questions

What size is A4 in pixels?
It depends on the resolution (DPI). At 300 DPI, standard for print, A4 (210 by 297 mm) is 2480 by 3508 pixels. At 72 DPI it is about 595 by 842 pixels, and at 150 DPI about 1240 by 1754 pixels. Pixel size equals the dimension in inches multiplied by the DPI.
Why is A4 210 x 297 mm?
A4 comes from the ISO 216 standard, where every size keeps a height-to-width ratio of the square root of two. Starting from A0, which has an area of one square metre, each size is made by folding the previous one in half. Four folds from A0 lands on A4 at 210 by 297 mm, which preserves that same proportion.
What is the difference between A4 and US Letter?
A4 (210 by 297 mm) is part of the international ISO 216 system, while US Letter (215.9 by 279.4 mm, or 8.5 by 11 inches) is the North American standard. A4 is slightly narrower and taller than Letter, so documents formatted for one may shift margins or clip content when printed on the other.
How do I convert a paper size to pixels for a given DPI?
Convert the dimension to inches (millimetres divided by 25.4), then multiply by the DPI and round to the nearest whole pixel. For example, A4 width of 210 mm at 300 DPI is 210 / 25.4 x 300, which rounds to 2480 pixels.

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