What Size Is A4 Paper?
A4, part of the Numbered / Announcement under the US Envelope Paper Sizes group, measures 159 x 108 mm, which is 15.9 x 10.8 cm or approximately 6.26 x 4.25 inches. It follows the US Envelope Standard specification and has an area of approximately 0.0172 m².
A4 Paper Size Dimensions & Conversions
A4 Dimensions in Different Units
| Unit | Width | Height |
|---|---|---|
| Millimeters | 159 mm | 108 mm |
| Centimeters | 15.9 cm | 10.8 cm |
| Inches | 6.26 in | 4.25 in |
| Feet | 0.52 ft | 0.35 ft |
| Meters | 0.159 m | 0.108 m |
| Points | 451 pt | 306 pt |
| Picas | 37.6 pc | 25.5 pc |
What Is A4 Paper Used For?
Mailing Correspondence
This envelope size is used for business mail, invitations, or announcements depending on its category.
Design and Layout
Designers and print professionals use A4 when a layout calls for this specific format.
Reproduction and Scaling
A4 can be scaled up or down to produce related sizes in the same series.
Presentations and Displays
A4 is suitable for boards, handouts, or displays sized to this format.
Archiving and Filing
Printed materials in A4 are stored and filed using standard folders sized for this format.
Digital Reference
A4 dimensions are used as a page-size preset in design and publishing software.