Printer Paper Size

A Paper Sizes Dimensions

A1

A1 Paper Size

Dimensions: 594 × 841 mm (23.39 × 33.11 in)

594 × 841mm

23.39 × 33.11 in

A1 measures 594 × 841 mm (23.39 × 33.11 in) and belongs to the ISO 216 standard. It is commonly used for architectural and engineering drawings.

Compare

ISO 216A Paper SizesWidely used

594 mm

841 mm

What size is A1 paper?

An A1 piece of paper measures 594 × 841 mm or 23.39 × 33.11 inches. It is part of the A Paper Sizes standard.

Units	Width × Height
Metric millimeters (mm)	594 × 841 mm
Metric centimeters (cm)	59.40 × 84.10 cm
Metric meters (m)	0.594 × 0.841 m
Imperial inches (in)	23.39 × 33.11 in
Typographic points (1/72 inch) (pt)	1683.78 × 2383.94 pt
Typographic picas (1/6 inch) (pc)	140.31 × 198.66 pc
Pixels at 300 DPI (px)	7,016 × 9,933 px

A1 is part of the a paper sizes standard. The A series traces its standardised dimensions to DIN 476, published in Germany in 1922. Georg Christoph Lichtenberg had described the underlying square-root-of-two aspect-ratio principle in 1786. ISO 216 brought the A and B trimmed-paper formats into an international standard in 1975; numbered A sizes retain approximately the same proportions as each sheet is halved.

Quick facts

Size (mm)594 × 841 mm
Size (inches)23.39 × 33.11 in
Aspect ratio1 : √2 (≈ 1.414)
StandardISO 216
Common useDocuments, letters, forms

Compare A1 with other sizes

Typical uses for A1

A1 measures 594 × 841 mm (23.39 × 33.11 in) and is used for the following tasks.

Architectural and engineering drawings
Event and retail posters
Presentation boards and wall charts
Proof sheets before large-format output

Printer tip

A1 needs a wide-format plotter or a commercial print service. Check the maximum roll width and supported media before sending the job.

A1 in the A series

Halving A1 along its long edge gives the nominal A2 size. Two A1 sheets make the nominal area of A0. Published whole-millimetre dimensions can differ slightly from an exact fold or cut.

A1 at common DPI

Pixel dimensions for A1 at popular resolutions. Rounded to whole pixels; physical sheet remains 594 × 841 mm.

96 DPI

2,245 × 3,179 px

Standard web & screen resolution

150 DPI

3,508 × 4,967 px

Medium quality draft printing

300 DPI

7,016 × 9,933 px

High quality commercial print

A1 at 72, 96, 150, 300 and 600 DPI
DPI	Width (px)	Height (px)
72	1,684	2,384
96	2,245	3,179
150	3,508	4,967
300	7,016	9,933
600	14,031	19,866

Last reviewed: 14 September 2026

Frequently Asked Questions

What are the dimensions of A1?

A1 measures 594 × 841 mm (23.39 × 33.11 inches).

What does A1 halve or double into?

Halving A1 across its long dimension gives the nominal A2 format (420 × 594 mm). Two A1 sheets make the nominal area of A0 (841 × 1189 mm). Published whole-millimetre dimensions can differ slightly from an exact fold or cut.

A1