A free paper size chart is a single browser page that lists every standard A, B, and US sheet in millimetres, centimetres, and inches, then turns any of them into pixels at the resolution you choose. The Paper Sizes Chart works exactly like that — opens in any browser, asks for nothing, and pairs a complete reference table with a live DPI-to-pixel converter so you can go from "A4" to "2480 × 3508 px at 300 DPI" in seconds. There is no account to create, no email to verify, no payment prompt, and nothing is uploaded because every calculation runs locally on your device. For anyone who has tried to print a poster at the wrong size or set a canvas without knowing the correct pixel dimensions, that combination — comprehensive reference, instant conversion, zero friction — is the whole point of a no-signup chart.
The A Series: How ISO 216 Sizes Stack Up
The international standard for paper is ISO 216, which defines the A series used almost everywhere outside North America. Its defining property 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 × 1189 mm. Halving A0 produces A1 (594 × 841 mm), then A2, A3, and the everyday A4 at 210 × 297 mm, continuing all the way down to A10 at 26 × 37 mm.
Designers, students, and office workers reach for A4 by reflex; print buyers use A3 for engineering drawings; A1 and A2 are poster staples. Because every size is a halving of the previous one, knowing any one A size makes the rest predictable: the height of A4 is the width of A3, the height of A3 is the width of A2, and so on up to A0. That consistency is the reason software, printers, and PDF page-size presets use the same labels worldwide, and why a single chart can answer nearly every "what size is X?" question without any account or sign-in step.
B Series and the US/ANSI Group
The B series sits between the A sizes and is used for posters, books, and envelopes when an in-between dimension is needed. B0 measures 1000 × 1414 mm (slightly larger than A0), and the same √2 ratio applies down through B1, B2, and beyond. North America, in contrast, uses its own ANSI and US conventions defined in inches rather than millimetres. US Letter is 8.5 × 11 inches (215.9 × 279.4 mm), US Legal is 8.5 × 14 inches (215.9 × 355.6 mm), and Tabloid — also called Ledger — is 11 × 17 inches (279.4 × 431.8 mm).
Because the US sizes 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 slightly narrower and slightly taller. A document formatted for Letter will shift margins or clip content when printed on A4, and that mismatch is one of the most common reasons to look up the dimensions before exporting. A reference table that puts ISO and ANSI side by side removes the guesswork in a single glance and explains the difference in plain numbers rather than vague memory.
Common Paper Sizes at a Glance
| Size | Standard | Millimetres (mm) | Centimetres (cm) | Inches (in) |
|---|---|---|---|---|
| A0 | ISO 216 | 841 × 1189 | 84.1 × 118.9 | 33.11 × 46.81 |
| A1 | ISO 216 | 594 × 841 | 59.4 × 84.1 | 23.39 × 33.11 |
| A2 | ISO 216 | 420 × 594 | 42.0 × 59.4 | 16.54 × 23.39 |
| A3 | ISO 216 | 297 × 420 | 29.7 × 42.0 | 11.69 × 16.54 |
| A4 | ISO 216 | 210 × 297 | 21.0 × 29.7 | 8.27 × 11.69 |
| A5 | ISO 216 | 148 × 210 | 14.8 × 21.0 | 5.83 × 8.27 |
| B0 | ISO 216 | 1000 × 1414 | 100.0 × 141.4 | 39.37 × 55.67 |
| B1 | ISO 216 | 707 × 1000 | 70.7 × 100.0 | 27.83 × 39.37 |
| B2 | ISO 216 | 500 × 707 | 50.0 × 70.7 | 19.69 × 27.83 |
| US Letter | ANSI/US | 215.9 × 279.4 | 21.59 × 27.94 | 8.5 × 11 |
| US Legal | ANSI/US | 215.9 × 355.6 | 21.59 × 35.56 | 8.5 × 14 |
| Tabloid / Ledger | ANSI/US | 279.4 × 431.8 | 27.94 × 43.18 | 11 × 17 |
How to Look Up a Size and Convert It to Pixels
The whole workflow takes about ten seconds once you know the four steps. The reference table and the converter live on the same page, so you can move from "what is A4?" to "what is A4 in pixels at 300 DPI?" without leaving the screen or creating an account.
- 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.
- Choose a paper size from the dropdown in the converter to load its exact dimensions into the input fields.
- Type the resolution you need in the DPI field — 300 is the standard for high-quality print, 72 is the classic screen value — to see the pixel width and height update instantly.
- Read off the pixel result alongside the millimetre, centimetre, and inch values to set up your canvas or export at the right size.
The conversion itself uses one fixed 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. For pixels, multiply the inch value by the DPI and round to the nearest whole pixel. A worked example using A4 at 300 DPI:
- Width: 210 mm ÷ 25.4 = 8.2677 in × 300 DPI = 2480.3 → 2480 pixels
- Height: 297 mm ÷ 25.4 = 11.6929 in × 300 DPI = 3507.9 → 3508 pixels
That is the exact 2480 × 3508 px canvas a print shop expects for an A4 page at print resolution. Drop the DPI to 72 and the same A4 sheet becomes 595 × 842 pixels — the screen-friendly size that matches the on-screen display conventions of older web and design software. Both results come straight out of the same formula, so the chart stays consistent whether you are exporting for a phone screen, an A3 poster, or a glossy A5 flyer.
Why a No-Signup Browser Chart Beats the Alternatives
Desktop design software and PDF editors can tell you the size of a page, but only after you have installed them, paid for a licence, and opened a project. Printable PDFs and static infographics give you the numbers but lock them in place — if you need the size at a different DPI, you start over. A live, in-browser chart removes every one of those barriers. There is no installer, no licence key, no account creation, and no email confirmation step. The chart loads in any modern browser, and because the calculation runs locally rather than on a remote server, your workflow never depends on a network round trip.
Privacy is part of the same package. No document, image, or personal detail is uploaded, because the chart does not need any of that to draw its table or do its math. If you are working with confidential layouts, internal print specs, or pre-release artwork, that "nothing leaves the device" property matters as much as the zero-cost price tag. You can read more about why that matters in this plain-English look at online chart safety, but the short version is: a pure-browser tool that does not ask you to upload or sign in has nothing to leak.
Where a Free Chart Fits in Your Workflow
A no-signup chart is most useful the moment a project collides with a physical paper size. Print buyers use it to size artwork at 300 DPI before sending files to a press; designers use it to set canvas dimensions in Photoshop, Illustrator, or Figma when the brief arrives with a sheet name but no pixel count. Students and teachers use it to confirm margins, while developers use it to verify report page sizes or export receipts and invoices at the correct dimension.
Because the converter accepts any DPI, the same chart covers web exports (72 or 96 DPI), high-quality print (300 DPI), and large-format work (often 150 DPI or less because the viewing distance is greater). Whichever workflow you run, the rule is the same: pick the paper size from the table, type the resolution you actually need, and copy the pixel result straight into your canvas or export preset. No downloads, no signups, no waiting — just the dimensions your project is asking for, served by a browser tab and a single formula.