Tool
Paper size converter
Convert any standard or custom paper size between millimetres, centimetres, inches and pixels. The pixel dimensions are calculated at common print DPI values so you can match your design to its final printed size.
| Unit | Width | Height |
|---|---|---|
| Millimetres | 210 | 297 |
| Centimetres | 21 | 29.7 |
| Inches | 8.268 | 11.693 |
| Points (pt) | 595.3 | 841.9 |
| Picas | 49.61 | 70.16 |
| Pixels @ 72 DPI | 595 | 842 |
| Pixels @ 96 DPI | 794 | 1,123 |
| Pixels @ 150 DPI | 1,240 | 1,754 |
| Pixels @ 200 DPI | 1,654 | 2,339 |
| Pixels @ 300 DPI | 2,480 | 3,508 |
| Pixels @ 600 DPI | 4,961 | 7,016 |
Points are PostScript points at exactly 1/72 inch — the unit inside PDF page boxes, InDesign, Illustrator and CSS pt. Twelve points make one pica. See paper sizes in points for the full table and the pt-versus-pixel distinction.
Scale this page onto another size
The percentage to type into a photocopier or a print dialog’s custom scale box. Each figure is the largest scale at which the current page still fits the target sheet — below 100% reduces, above 100% enlarges.
Proportional preview
A4
Dashed outline: a standard credit card (ISO/IEC 7810, 85.6 × 54 mm) at the same scale.
The everyday office and document size used across most of the world.
Common uses
Letters · Reports · CVs · Flyers · Invoices
Keeps these settings in the link. Useful for moving from a phone to the computer with the printer on it.
Frequently asked questions
Why are the pixel dimensions different at different DPI values?
DPI (dots per inch) describes how many pixels are packed into each printed inch. The same physical page contains more pixels at 300 DPI than at 72 DPI, so the pixel resolution scales with DPI while the physical size stays constant.
Which DPI should I use?
For everyday office printing, 150 DPI is usually fine. For commercial print (flyers, business cards, magazines), 300 DPI is the standard. 600 DPI is mainly used for fine text and small details. 72 DPI is a screen-only convention and not suitable for print.
Are these sizes exact?
The ISO A-series sizes (A0–A6) are defined as exact integer millimetres by ISO 216. US sizes (Letter, Legal, Tabloid) are defined in inches and converted to millimetres using 25.4 mm per inch.
What is A4 in points?
A4 is 595 × 842 points — the numbers you see in a PDF page box, in InDesign’s document setup and in an Illustrator artboard. The exact values are 595.276 × 841.890 pt, because a point is 1/72 inch and A4 is defined in whole millimetres, so the conversion never lands on a round number. Tools round to whole points, which is why 595 × 842 is what you normally read.
Is a CSS pt the same as a PostScript point?
Yes in definition, no in practice. Both are 1/72 inch, but CSS resolves an inch to exactly 96 CSS pixels regardless of your actual screen, so 1 pt renders as 1.333 CSS px. That makes pt reliable for print stylesheets and misleading for screen layout — for screens use px or rem, and keep pt for anything destined for paper or PDF.
What percentage do I use to enlarge A4 to A3, or reduce A3 to A4?
A4 to A3 is 141% and A3 to A4 is 71% — the two numbers every photocopier keypad carries as presets. They come from the ISO 1:√2 ratio: √2 ≈ 1.414 to go up one size, 1/√2 ≈ 0.707 to go down one. The same pair works for every neighbouring step in the A-series (A5→A4, A2→A1 and so on), which is exactly what the ratio was designed for.
Why is scaling between A4 and US Letter not a round number?
Because the two formats are not proportional to each other. A4 is narrower and taller than Letter, so no single percentage fits both dimensions: reducing A4 to fit Letter takes about 94%, and enlarging Letter to fill A4 takes about 97% — with a strip of unused paper either way. The calculator above always shows the larger safe figure, the one that keeps the whole page on the sheet.
Why does my printer not print at full page size?
Most consumer inkjet and laser printers cannot print all the way to the paper edge — they reserve a 3–5 mm margin. If you need full-bleed prints, you have to either print on slightly oversized paper and trim, or use a commercial print service.