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ANSI Paper Sizes

December 8, 2020 Leave a Comment

Architectural Paper Sizes

North America has a special series of paper sizes defined for architectural purposes. In general these have aspect ratios of 4:3 or 3:2 which are similar to the aspect ratio of computer screens. Sizes are used for technical drawings in Structural Engineering, Mechanical Engineering, HVAC Engineering, Hydraulic Engineering, Electrical Engineering, Plumbing Drawings, Shop Detailing and Architectural Drafting etc.

 The following table gives details of the sizes for architectural paper.

SizeWidth x Height (mm)Width x Height (in)Aspect Ratio
Arch A229 x 305 mm9.0 x 12.0 in4:3
Arch B305 x 457 mm12.0 x 18.0 in3:2
Arch C457 x 610 mm18.0 x 24.0 in4:3
Arch D610 x 914 mm24.0 x 36.0 in3:2
Arch E914 x 1219 mm36.0 x 48.0 in4:3
Arch E1762 x 1067 mm30.0 x 42.0 in7:5
ANSI Architectural Paper Sizes Illustration

ANSI Standard Paper Sizes

ANSI (American National Standards Insitute) defined a regular series of paper sizes based around the Letter (8.5″ x 11″) format, with this becoming the A sizes and larger sizes being B,C,D & E.

Unlike the ISO standard sizes which have the single aspect ratio of 1:√2, ANSI standard sizes have two aspect ratios 1:1.2941 and 1:1.5455 which means that enlarging and reducing between the sizes is not as easy as with the ISO sizes and leaves wider margins on the enlarged/reduced document.

SizeWidth x Height (mm)Width x Height (in)Aspect RatioNearest ISO
A216 x 279 mm8.5 x 11.0 in1:1.2941A4
B279 x 432 mm11.0 x 17.0 in1:1.5455A3
C432 x 559 mm17.0 x 22.0 in1:1.2941A2
D559 x 864 mm22.0 x 34.0 in1:1.5455A1
E864 x 1118 mm34.0 x 44.0 in1:1.2941A0
ANSI Paper Sizes Illustration

Download the PDF and DWG files of these ANSI Paper Sizes Illustrations

ANSI ARCH Titleblocks for CAD Drafting

Title Block DescriptionSoftwareURL For Free DownloadImage Preview
ANSI Architectural Borderless Title Block Series. Paper Sizes included ARCH A, ARCH B, ARCH C, ARCH D, ARCH E, ARCH E1.Revit 2021https://families.draftsperson.net/download/ansi-architectural-titleblocks-borderless-style/
ANSI Architectural Grey Style Title Sheet Series. Paper Sizes included ARCH A, ARCH B, ARCH C, ARCH D, ARCH E, ARCH E1.Revit 2017https://families.draftsperson.net/download/ansi-architectural-title-sheet-grey-style/
ANSI Borderless Vertical Box Style, Title Sheet Series. Paper Sizes included A, B, C, D, and ERevit 2021https://families.draftsperson.net/download/ansi-standard-paper-size-titleblocks/
ANSI Grey Style Title Sheet Series. Standard Paper Sizes included A, B, C, D and A.Revit 2017https://families.draftsperson.net/download/ansi-standard-paper-sizes-titleblocks-grey-style/

Filed Under: CAD Standards, Drafting Standards

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