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Construction drawing paper sizes

Every standard drawing sheet size in one place: ISO A0 to A4, ANSI A to E, and ARCH A to E, listed in both millimetres and inches. Use the converter for a quick mm to inch (or back), or generate a correctly sized blank PDF page with one click. The PDF is built in your browser and never uploaded.

Quick converter
mm
=
in
1 inch = 25.4 mm. Type in either box.
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Pick a size and get a correctly dimensioned blank PDF page, built in your browser.
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ISO A series (metric standard)

The default for architectural and engineering drawings outside the US. Each size is exactly half of the one above it.

Sizemm (W x H)inches (W x H)Typical use
A0841 x 118933.1 x 46.8Large site & general arrangement plans
A1594 x 84123.4 x 33.1Main working drawings, plans, sections
A2420 x 59416.5 x 23.4Detail sheets, smaller plans
A3297 x 42011.7 x 16.5Half-size prints, schedules, details
A4210 x 2978.3 x 11.7Letters, specs, single-sheet details

ANSI series (US engineering)

Based on US Letter (8.5 x 11 in). Common for mechanical and engineering drawings in the US.

Sizeinches (W x H)mm (W x H)Notes
ANSI A8.5 x 11216 x 279Letter
ANSI B11 x 17279 x 432Ledger / Tabloid
ANSI C17 x 22432 x 559,
ANSI D22 x 34559 x 864,
ANSI E34 x 44864 x 1118Largest standard ANSI sheet

ARCH series (US architectural)

Based on a 9 x 12 in sheet. The usual choice for US architectural drawings, giving slightly wider sheets than ANSI.

Sizeinches (W x H)mm (W x H)Notes
ARCH A9 x 12229 x 305,
ARCH B12 x 18305 x 457,
ARCH C18 x 24457 x 610,
ARCH D24 x 36610 x 914Common full-size sheet
ARCH E36 x 48914 x 1219Largest standard ARCH sheet
ARCH E130 x 42762 x 1067Widely used variant
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Frequently Asked Questions

What size is A1 paper?
A1 is 594 x 841 mm, or 23.4 x 33.1 inches. It is the most common large-format sheet for architectural and engineering drawings. A1 is exactly half of A0 and double A2, which is how the whole ISO A series works: fold any sheet in half and you get the next size down.
What is the difference between ANSI and ARCH sizes?
ANSI sizes (A to E) are based on the US Letter sheet (8.5 x 11 in) doubled up, common in mechanical and engineering drawings. ARCH sizes (A to E) are based on a 9 x 12 in sheet and are the usual choice for US architectural drawings. ISO A sizes (A0 to A4) are the metric standard used in most of the rest of the world.
Does the blank-PDF generator upload my data?
No. The blank PDF is created entirely in your browser on your own device. Nothing is sent to a server, nothing is stored, and there is no file to upload in the first place. The same is true for the converter.
How do I convert millimetres to inches for a drawing?
Divide millimetres by 25.4 to get inches (1 inch = 25.4 mm). For example 841 mm / 25.4 = 33.1 in. The converter on this page does it both ways instantly, which is handy when a sheet is specced in one unit but your title block or plotter expects the other.