Quick answer: A0 paper is 841 × 1189 millimetres, or 84.1 × 118.9 centimetres and approximately 33.11 × 46.81 inches. It has the ISO A-series aspect ratio of 1:√2, so it can be enlarged or reduced to neighbouring A sizes without changing the page shape.
A0 is the starting sheet in the ISO A series. Its nominal area is one square metre; rounding the sides to whole millimetres produces the published 841 × 1189 mm dimensions.
Measurement note: dimensions are stated width × height in portrait orientation. Turn the sheet through 90 degrees for landscape use. Millimetres are the controlling values for ISO sizes; inch figures are rounded conversions.
A0 dimensions
| Unit | Width | Height |
|---|---|---|
| Millimetres | 841 mm | 1189 mm |
| Centimetres | 84.1 cm | 118.9 cm |
| Inches | 33.11 in | 46.81 in |
| Area | 999,949 mm² | 0.9999 m² |
For A0, the stated size is the finished, trimmed sheet. It does not include printer bleed, crop marks, binding allowance or the non-printable border imposed by a particular machine. For a general comparison, see the complete paper size chart and the explanation of ISO 216 paper sizes.
What is A0 paper used for?
A0 is commonly chosen when the reader needs a page that is large enough for display and detailed layouts. Typical uses include:
- Architectural and engineering presentation boards
- Large exhibition graphics viewed from several metres away
- Full-size planning diagrams and educational wall charts
- Large artwork and photographic prints
Whether A0 is the right choice still depends on viewing distance, amount of information, type size, folding, finishing and the printer available. A format can be technically large enough but still feel crowded if the design has no clear hierarchy or if essential text is placed too close to the trim.
How A0 relates to other A sizes
- Cutting A0 in half parallel to its short edge produces two A1 sheets.
- Relative to A4, A0 has 16 times the area of A4.
- Because every A size has the same 1:√2 aspect ratio, a layout can be scaled proportionally between A sizes without cropping. Type and line weights must still be checked because a mathematically scaled design may become too small or too heavy in practice.
Printing on A0 paper
Most jobs at this size require a wide-format inkjet, production toner press or commercial lithographic press.
- Set the document page to exactly 841 × 1189 mm for a finished A0 page.
- Use PDF for final artwork unless the printer asks for another format; embed fonts and keep placed images at an effective resolution suitable for the viewing distance.
- Add the printer’s requested bleed. A common commercial value is 3 mm on every edge, but the correct figure is the one in the supplier’s specification.
- Keep text, logos and critical marks inside a safe area. Ten millimetres is a useful starting point for many general jobs, although binding and large-format finishing can require more.
- Print or view a 100% scale proof and verify one known measurement before authorising the full run.
Page size with 3 mm bleed
With 3 mm bleed on all four sides, the artwork canvas becomes 847 × 1195 mm. The final product is still trimmed back to 841 × 1189 mm. Do not enlarge the finished dimensions themselves to create bleed; extend background images and colours beyond the trim line.
Choosing weight and finish
For display work, stiffness and installation method matter as much as grammage; mounted paper, synthetic media or board may be more appropriate than a heavier loose sheet.
For a A0 job, uncoated paper is easy to write on and usually gives a natural, low-glare surface. Coated stocks reproduce photographs and solid colour more sharply but may crack on folds unless the grain direction and scoring are handled correctly. Always confirm the machine’s supported paper range before buying a full pack.
Is A0 the right size?
Choose A0 when its finished dimensions match the way the piece will be read, carried, displayed or mailed. If the content feels crowded, move up to a larger display format; if there is excessive empty space or portability matters more, test A1. A physical dummy is more reliable than judging scale only on a monitor.
Frequently asked questions
What is A0 in inches?
A0 is approximately 33.11 × 46.81 inches. These are rounded conversions; use 841 × 1189 mm for accurate setup and production.
What aspect ratio is A0?
A0 has the 1:√2 aspect ratio, approximately 1:1.414. This is shared by all ISO A-series sizes.
How many A1 sheets fit in A0?
Two A1 sheets have the same nominal area as one A0 sheet. Four sheets of A2 would fit if that size exists and cutting loss is ignored.
Sources and standards
The measurements and production guidance in this guide were checked against the following standards bodies, postal operators and print-platform specifications. Standards can be revised or withdrawn, so check the linked record when a contractual or regulated specification matters.