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Paper Size Reference

Quickly compare A-series paper sizes, US Letter, Legal, Tabloid, and custom paper dimensions in mm, inches, points, pixels, aspect ratio, and printable area.

Paper Size Reference
✦ Quick examples
Custom sheet dimensions
scale-aware sheet preview A4 + Letter ghost guides
ISO A Series · Portrait
A4
210 × 297 mm

Embed Paper Size Reference Widget
ISO A Series · Portrait · 300 dpi
A4
The default office paper size in most countries.
Millimeters
210 × 297 mm
Centimeters
21 × 29.7 cm
Inches
8.268 × 11.693 in
Points
595.3 × 841.9 pt
Pixels
2,480 × 3,508 px
Area / Ratio
623.7 cm² · 1:1.414
A4 and Letter comparison
A4
Same area as A4
0 mm width · 0 mm height
US Letter
3.4% larger than US Letter
-5.9 mm width · 17.6 mm height
Fold A4 in half across the long edge to get A5; place two A4 sheets together to make A3.
Closest standard sizes
US Letter (North American)
215.9 × 279.4 mm · 3.4% larger area
US Legal (North American)
215.9 × 355.6 mm · 18.8% smaller area
Executive (North American)
184.15 × 266.7 mm · 27.0% larger area
Tabloid / Ledger (North American)
279.4 × 431.8 mm · 48.3% smaller area
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About Paper Size Reference

The Paper Size Reference helps you compare ISO A-series paper, North American paper sizes such as US Letter and Legal, and custom paper dimensions. It converts each size into millimeters, centimeters, inches, points, print pixels, aspect ratio, and area, with a proportional preview that makes differences easier to see before printing or designing a document.

How to Use the Paper Size Reference

  1. Choose a standard size or custom size: Select A4, US Letter, Legal, Tabloid, or another preset from the paper size menu. Choose Custom size when you need to compare your own dimensions.
  2. Set orientation and print resolution: Pick portrait or landscape, then choose the DPI value you want for the pixel guide, such as 300 dpi for print.
  3. Enter custom dimensions when needed: For a custom sheet, type the width and height and choose millimeters, centimeters, or inches.
  4. Review dimensions and closest matches: Use the result cards to read the size in mm, cm, inches, points, pixels, aspect ratio, area, and closest standard paper sizes.

A-Series Paper Sizes

The ISO A series uses the √2 aspect ratio, so each sheet keeps the same proportions when it is folded or cut in half. A0 is defined as roughly one square meter, and each smaller size halves the area.

Size Millimeters Inches Common use
A0 841 × 1,189 mm 33.11 × 46.81 in Large posters, architectural sheets, display layouts
A1 594 × 841 mm 23.39 × 33.11 in Posters, flip charts, technical drawings
A2 420 × 594 mm 16.54 × 23.39 in Medium posters, diagrams, presentation boards
A3 297 × 420 mm 11.69 × 16.54 in Posters, spreads, menus, drawings
A4 210 × 297 mm 8.27 × 11.69 in Letters, forms, office printing, PDFs
A5 148 × 210 mm 5.83 × 8.27 in Notebooks, flyers, compact handouts
A6 105 × 148 mm 4.13 × 5.83 in Postcards, inserts, small flyers
A7 74 × 105 mm 2.91 × 4.13 in Pocket notes, tickets, labels
A8 52 × 74 mm 2.05 × 2.91 in Small cards, labels, tags
A9 37 × 52 mm 1.46 × 2.05 in Tiny labels and tickets
A10 26 × 37 mm 1.02 × 1.46 in Stamps, small tags, mini labels

US Letter, Legal, and Other North American Sizes

North American office sizes are inch-based and do not follow the A-series folding ratio. This is why scaling A4 artwork to US Letter, or Letter artwork to A4, often leaves margins or requires cropping.

Size Millimeters Inches Common use
US Letter 215.9 × 279.4 mm 8.5 × 11 in US and Canadian office documents
US Legal 215.9 × 355.6 mm 8.5 × 14 in Contracts, legal documents, long forms
Tabloid / Ledger 279.4 × 431.8 mm 11 × 17 in Newsletters, spreads, folded booklets
Executive 184.15 × 266.7 mm 7.25 × 10.5 in Business notes and compact correspondence
Half Letter 139.7 × 215.9 mm 5.5 × 8.5 in Booklets, inserts, planner pages

Paper Size Comparison Tips

A-series ratio: A0 through A10 use the √2 ratio, approximately 1:1.414. This makes them scale cleanly between sizes, such as A3 to A4 or A4 to A5.

Pixel dimensions: Pixel size depends on print resolution. Multiply width and height in inches by DPI. A 300 dpi file is standard for many print jobs, while 150 dpi is often enough for drafts or large posters viewed from a distance.

Frequently Asked Questions

What is A4 paper size in inches?

A4 paper is 210 × 297 mm, which is approximately 8.27 × 11.69 inches. It is slightly narrower and taller than US Letter paper.

Is US Letter the same as A4?

No. US Letter is 8.5 × 11 inches, or 215.9 × 279.4 mm. A4 is 210 × 297 mm, so Letter is wider and shorter while A4 is narrower and taller.

What size is Legal paper?

US Legal paper is 8.5 × 14 inches, or 215.9 × 355.6 mm. It has the same width as US Letter but is 3 inches taller.

How do I choose pixels for print?

Multiply the paper width and height in inches by the target DPI. For example, A4 at 300 dpi is about 2480 × 3508 pixels. Use 300 dpi for most print artwork and 150 dpi for drafts.

Can I use this for custom paper sizes?

Yes. Select Custom size, enter width and height in millimeters, centimeters, or inches, and the tool will show converted dimensions, pixel size, aspect ratio, area, and the closest standard paper sizes.

Additional Resources

Reference this content, page, or tool as:

"Paper Size Reference" at https://MiniWebtool.com/paper-size-reference/ from MiniWebtool, https://MiniWebtool.com/

by miniwebtool team. Updated: Apr 30, 2026

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