ISO 216 · A-series
A1 paper size — 594 × 841 mm
A1 is 594 × 841 millimetres (23.39 × 33.11 in) — the half-step below A0 and the most common size for indoor posters, flip charts and architectural drawings. Large enough to command a wall, small enough to carry rolled.
A1 — instant conversion
| Unit | Width | Height |
|---|---|---|
| Millimetres (mm) | 594 mm | 841 mm |
| Centimetres (cm) | 59.4 cm | 84.1 cm |
| Inches (in) | 23.386 in | 33.11 in |
| Pixels @ 300 DPI | 7016 px | 9933 px |
| PostScript points (pt) | 1683.8 pt | 2383.9 pt |
| Picas | 140.31 | 198.66 |
Change the DPI selector to see the pixel resolution at 72, 96, 150, 200, 300 or 600 DPI. Physical dimensions (mm, cm, in, pt, picas) do not change with DPI.
A1 in the A-series
| Size | Millimetres | Relation to A1 | Page |
|---|---|---|---|
| A0 | 841 × 1189 | 2 × A1 | A0 page |
| A1 | 594 × 841 | — | (this page) |
| A2 | 420 × 594 | ½ × A1 | A2 page |
| A3 | 297 × 420 | ¼ × A1 | A3 page |
| A4 | 210 × 297 | ⅛ × A1 | A4 page |
Resolution guide: at 150 DPI (the large-format standard) A1 is 3508 × 4967 px (17.4 MP). A 300 DPI file reaches 70 MP with no visible benefit at normal poster viewing distance.
A1 · 594 × 841 mm
Where A1 is used
- Indoor advertising and event posters
- Flip charts and presentation pads
- Architectural and engineering drawings
- Exhibition and conference panels
- Shop-window and point-of-sale displays
- Classroom charts and teaching aids
A1 poster design specs
- Bleed
- 3–5 mm → export up to 604 × 851 mm
- Headline size
- 72 pt+ for reading at 2–3 m
- Body text
- 24 pt+ so it remains readable at 1 m
- Home printing
- Tile across 8 A4 sheets (2 × 4 grid) — use the poster split calculator
Frequently asked questions
What size is A1 paper?
A1 is 594 × 841 millimetres — 59.4 × 84.1 cm, approximately 23.39 × 33.11 inches. It sits between A0 and A2 in the halving series — nominally half of A0 and double A2 (ISO rounds every size to whole millimetres, so both ratios land within 0.15 % of exact).
What is A1 in pixels?
At 150 DPI (the practical large-format standard) A1 is 3508 × 4967 pixels. At 300 DPI it is 7016 × 9933 px (~70 MP) — rarely needed since A1 is viewed from a distance.
What is A1 used for?
Indoor posters, flip charts, architectural drawings, exhibition panels, shop-window displays and classroom charts. A1 is the largest size that is still easy to carry rolled under one arm.
How many A4 sheets make an A1?
Nominally eight (A1 = 2 × A2 = 4 × A3 = 8 × A4 in the halving series). To print an A1 poster at home, tile it across 8 A4 pages in a 2 × 4 grid with small overlaps — exact edge-to-edge butting falls about a millimetre short because ISO rounds sizes to whole millimetres.
Is A1 a standard flip-chart size?
Yes — most flip-chart pads are A1 (594 × 841 mm), occasionally slightly trimmed to fit specific easel clamps. When buying replacement pads, check the easel's clamp width against the 594 mm sheet width.
Can a home printer print A1?
No — A1 requires a large-format plotter (common in architecture offices and copy shops). At home, either tile across 8 A4 sheets or order from an online large-format print service.