Result in Inches
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Equivalent dimension
Instantly convert A3 paper dimensions between mm, cm, inches, and pixels
Convert A3 paper size to inches, millimetres, and centimetres with one click. Includes pixel dimensions at 72, 96, 150, and 300 DPI, full ISO paper size reference tables, and bidirectional mm ↔ inches conversion for 2026.
Professional paper size conversion for printing, design, and document formatting
A3 paper measures exactly 297 × 420 mm, which equals 11.69 × 16.54 inches. Our converter uses the exact ratio of 1 inch = 25.4 mm as defined by the international standard, ensuring precise results for print production, technical drawings, and graphic design work.
Need A3 in pixels? Our tool calculates exact pixel dimensions at 72 DPI (screen), 96 DPI (web), 150 DPI (medium print), and 300 DPI (professional print). At 300 DPI, A3 is 3508 × 4961 pixels — the standard for high-quality printing and press-ready artwork in 2026.
Convert any custom dimension from millimetres to inches or inches to millimetres — not just standard A3. Whether you're scaling up from A4, working with custom print formats, or adapting designs between metric and imperial systems, this tool handles all your paper size conversion needs instantly.
Select conversion direction and enter your measurement value below
A3 paper is part of the ISO 216 international paper size standard, which defines a family of paper sizes based on a consistent aspect ratio of 1:√2 (approximately 1:1.4142). A3 measures 297 mm × 420 mm in portrait orientation, which converts to exactly 11.69 × 16.54 inches. It is precisely twice the area of A4 paper and half the area of A2. This consistent doubling relationship is the key feature of the ISO 216 system, making scaling between sizes straightforward for printing and design professionals.
A3 is widely used for posters, technical drawings, architectural plans, large spreadsheets, presentation materials, and folded A4 brochures. It is the standard large-format paper size in offices, print shops, and design studios across Australia, Europe, Asia, and most of the world. In the United States, the closest equivalent is the Tabloid / Ledger size (11 × 17 inches), though the dimensions differ slightly. Understanding A3 in inches is essential when working with US-based software, printers, or clients — you can review ISO 216 specifications on the official ISO website.
A3 (297×420 mm / 11.69×16.54 in) is exactly twice the size of A4. Folding an A3 sheet in half gives you two A4 pages — this consistent 1:√2 ratio is the foundation of the ISO 216 standard.
The reference table below shows A3 dimensions in all common units used in printing, digital design, and document management in 2026. For land area measurements relevant to large-format printing and planning, also see our Acres to Square Metres Converter.
| Unit | A3 Width | A3 Height | Orientation |
|---|---|---|---|
| Inches (in) | 11.69 in | 16.54 in | Portrait |
| Millimetres (mm) | 297 mm | 420 mm | Portrait |
| Centimetres (cm) | 29.7 cm | 42.0 cm | Portrait |
| Points (pt) | 841.89 pt | 1190.55 pt | Portrait |
| Picas (pc) | 70.16 pc | 99.21 pc | Portrait |
| Pixels @ 72 DPI | 842 px | 1191 px | Portrait |
| Pixels @ 96 DPI | 1123 px | 1587 px | Portrait |
| Pixels @ 150 DPI | 1754 px | 2480 px | Portrait |
| Pixels @ 300 DPI | 3508 px | 4961 px | Portrait (Print Standard) |
| Pixels @ 600 DPI | 7016 px | 9921 px | Portrait (High Res) |
| Landscape inches | 16.54 in | 11.69 in | Landscape |
The complete ISO 216 A-series paper sizes are shown below, converted to inches for quick reference. A3 sits between A2 and A4 in this internationally recognised system used across most of the world in 2026.
| Paper Size | mm (W × H) | Inches (W × H) | Pixels @ 300 DPI | Common Use |
|---|---|---|---|---|
| A0 | 841 × 1189 mm | 33.11 × 46.81 in | 10236 × 14043 px | Large posters, technical plans |
| A1 | 594 × 841 mm | 23.39 × 33.11 in | 7016 × 9933 px | Flip charts, large posters |
| A2 | 420 × 594 mm | 16.54 × 23.39 in | 4961 × 7016 px | Drawings, medium posters |
| A3 | 297 × 420 mm | 11.69 × 16.54 in | 3508 × 4961 px | Posters, drawings, brochures |
| A4 | 210 × 297 mm | 8.27 × 11.69 in | 2480 × 3508 px | Standard office / documents |
| A5 | 148 × 210 mm | 5.83 × 8.27 in | 1748 × 2480 px | Notebooks, flyers, booklets |
| A6 | 105 × 148 mm | 4.13 × 5.83 in | 1240 × 1748 px | Postcards, pocket notepads |
| A7 | 74 × 105 mm | 2.91 × 4.13 in | 874 × 1240 px | Small cards, invitations |
A3 is one of the most versatile paper sizes in professional and creative work. Understanding its exact dimensions in inches and pixels ensures accurate output across every application.
A3 is the standard format for high-quality poster printing, brochures, and promotional materials. At 300 DPI, an A3 document requires a canvas of 3508 × 4961 pixels. Most professional print houses require files submitted at 300 DPI with at least 3 mm bleed on all sides — knowing the exact inch dimensions is essential for correct file setup.
Engineers and architects use A3 for technical drawings, floor plans, and schematics that are too detailed for A4 but don't require the full A2 format. At 11.69 × 16.54 inches, A3 provides enough space for complex diagrams while remaining practical to handle and fold in the field.
Designers working in Adobe InDesign, Illustrator, or Photoshop frequently need A3 dimensions in inches or pixels. Setting up an A3 artboard in Photoshop at 300 DPI requires a canvas of exactly 3508 × 4961 pixels. Incorrect dimensions are among the most common causes of print rejection at production houses.
Business users print A3 landscape (16.54 × 11.69 inches) for wide spreadsheets, financial reports, Gantt charts, and project timelines that don't fit on A4. Most modern office printers support A3, and knowing the exact dimensions helps configure print settings correctly in Excel, Numbers, or Google Sheets.
A3 is standard for classroom display materials, science project posters, mind maps, and large-format worksheets. A3 portrait at 11.69 × 16.54 inches provides approximately 4× the writing area of A5, making it ideal for brainstorming boards, revision summaries, and visual learning aids.
A3 is a popular photo print size, particularly for landscape panoramas. A printed photograph at A3 (11.69 × 16.54 in) at 300 DPI gives excellent sharpness and detail. Map publishers use A3 for regional street maps and topographic charts that require detail beyond what A4 can accommodate while remaining foldable.
A3 (11.69 × 16.54 in) and US Tabloid/Ledger (11 × 17 in) are often confused but are not the same size. A3 is slightly wider (0.69 inches) and slightly shorter (0.46 inches) than Tabloid. When printing A3 files on a US Tabloid printer without adjustment, content may be slightly cropped or need scaling. Always confirm which size standard your printer or software is set to before finalising a document layout.
Converting A3 paper dimensions from millimetres to inches is a straightforward division. Here is the exact process used in this calculator.
Never confuse mm and cm when entering dimensions — setting up an A3 document as 29.7 × 42 mm instead of 29.7 × 42 cm creates a page 10× too small. Also ensure you select the correct DPI for your output: 72/96 DPI is for screen display only, while professional printing always requires at least 300 DPI. Submitting a 96 DPI file to a print house will produce blurry, pixelated results even though it may look sharp on screen.
ISO 216 defines the international A, B, and C series paper sizes. The system is based on a consistent 1:√2 aspect ratio, meaning each size in the series is exactly half the area of the next larger size. A3 (297×420 mm) is one of the most widely used formats for professional and commercial printing worldwide.
ISO 216 Reference →DPI (dots per inch) determines print sharpness. At 300 DPI, an A3 document is 3508 × 4961 pixels — the minimum standard for professional printing. Screens typically display at 72–96 DPI. Understanding DPI is critical for designers preparing artwork for both digital and physical output in 2026.
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