The letter R paper size is not a standard ISO or ANSI size; it most commonly refers to a specific architectural or engineering paper size in the “Arch R” series, measuring 8.5 × 10.5 inches (216 × 267 mm). This size is rarely used today, but it appears in older technical drawings and some specialized printing contexts.
What Exactly Is the Letter R Size?
The “R” in letter R paper typically denotes a size from the ANSI/ASME Y14.1 architectural drawing series, which includes sizes like Arch A (9 × 12 inches), Arch B (12 × 18 inches), and so on. However, the specific “letter R” (sometimes called “Statement R” or “Half-Letter” in some contexts) is an 8.5 × 10.5 inch sheet. This is slightly shorter than the standard US Letter (8.5 × 11 inches) and slightly wider than the international A4 (210 × 297 mm, about 8.27 × 11.69 inches).
In practice, the term “letter R” is ambiguous. It can also be a shorthand for “recycled letter” paper or a placeholder in document templates. But in technical drawing, it refers to the Arch R size, which was designed to fit more drawings on a standard filing cabinet while maintaining a consistent aspect ratio (1:1.235) with other Arch sizes.
Why Does the Letter R Size Exist?
The Arch R series was developed by the American National Standards Institute (ANSI) in the mid-20th century to standardize architectural and engineering drawings. The “R” likely stands for “roll” or “ratio,” as these sizes were meant to be cut from rolls of paper with minimal waste. The 8.5 × 10.5 inch size is essentially a trimmed version of the 9 × 12 inch Arch A, allowing it to fit into standard letter-sized folders and binders while still providing a recognizable drawing area.
Today, most architectural drawings use the larger Arch C, D, and E sizes, and the letter R has largely fallen out of use. However, some older blueprints and technical manuals still reference it, and a few niche printers offer it for historical reproductions.
How Does Letter R Compare to Other Paper Sizes?
To understand letter R, it helps to see it alongside common sizes:
- US Letter: 8.5 × 11 inches (216 × 279 mm) – the standard for office documents in North America.
- Legal: 8.5 × 14 inches (216 × 356 mm) – used for contracts and legal documents.
- A4: 210 × 297 mm (8.27 × 11.69 inches) – the international standard, slightly narrower and longer than US Letter.
- Letter R (Arch R): 8.5 × 10.5 inches (216 × 267 mm) – shorter than Letter, same width.
- Half Letter: 5.5 × 8.5 inches (140 × 216 mm) – exactly half of US Letter.
The key difference is the height: letter R is half an inch shorter than US Letter, which can affect margins and layout. If you print a document formatted for US Letter onto letter R, the bottom line may be cut off.
Where Is Letter R Used Today?
You are unlikely to find letter R paper in a typical office supply store. Its main uses today are:
- Historical reproductions: Re-printing old architectural drawings or military documents that used the size.
- Specialized plotting: Some wide-format plotters offer Arch R as a preset for small technical sketches.
- Custom stationery: A few boutique papermakers produce 8.5 × 10.5 inch sheets for invitations or art prints, calling it “statement size.”
- Digital templates: Some PDF forms and print-on-demand services use the dimensions as a custom setting.
If you need letter R paper, you will likely have to trim standard Letter sheets or order custom-cut paper from a specialty supplier.
Common Problems and Misconceptions
One common misconception is that “letter R” means “recycled letter” paper. While recycled paper is available in standard sizes, the term does not imply any environmental certification. Another confusion arises with the “R” in “Super B” or “A3+” sizes, which are unrelated.
A practical problem is printer compatibility. Most home and office printers are designed for US Letter or A4. If you force-feed letter R paper, the printer may jam or misdetect the size. Always check your printer’s manual for supported custom sizes before attempting to use non-standard paper.
How to Choose the Right Paper Size
If you are considering using letter R for a project, ask yourself these questions:
- What is the final use? For archival drawings, stick to standard Arch sizes like Arch A (9×12) or Arch B (12×18).
- Will it be printed at home? If yes, choose US Letter or A4 to avoid printer issues.
- Does it need to fit a specific binder? Letter R fits in standard letter binders, but the shorter height may look odd.
- Is it for digital distribution? Use a standard PDF size like US Letter or A4 for universal compatibility.
In most cases, you are better off using a standard size. Letter R is a niche choice that offers no practical advantage over US Letter for general use.
Cost and Availability
Standard US Letter paper costs about $0.01 to $0.03 per sheet for bulk office paper. Letter R, if you can find it, will be significantly more expensive due to custom cutting. Specialty suppliers may charge $0.50 to $2.00 per sheet, plus shipping. For large quantities, you could order a ream of 8.5 × 10.5 inch paper from a paper mill, but the minimum order is often 500 sheets, making it impractical for most individuals.
Template for Letter R Paper
If you need to create a document in letter R size, here is a blank template you can use as a starting point. It includes standard margins and a placeholder for content.
| Field | Content |
|---|---|
| Document Title | _________________________ |
| Author | _________________________ |
| Date | _________________________ |
| Revision | _________________________ |
| Notes | _________________________ |
Sample (fictional): Document Title: “Kitchen Remodel Plan”; Author: “J. Smith”; Date: “2024-03-15”; Revision: “A”; Notes: “Scale 1:50, all dimensions in inches.”
To use this template, copy the table into your word processor, set the page size to 8.5 × 10.5 inches, and fill in the blanks. Remember to adjust margins to at least 0.5 inches to avoid printing issues.
Frequently Asked Questions
Is letter R the same as A4?
No. A4 is 210 × 297 mm (8.27 × 11.69 inches), which is slightly narrower and longer than letter R (8.5 × 10.5 inches). They are not interchangeable.
Can I print on letter R paper with a regular printer?
Most printers support custom paper sizes, but you must set the paper size in the print dialog. However, the paper itself is not widely available, so you would need to cut it yourself. Cutting 8.5 × 11 sheets down to 8.5 × 10.5 is straightforward with a paper cutter.
Why is letter R paper not sold in stores?
Because demand is extremely low. The size was designed for a specific era of architectural drafting that has passed. Modern CAD software and large-format printers use standard Arch sizes, so there is no commercial need for letter R.
What does the “R” stand for?
In the ANSI Arch series, the “R” likely stands for “ratio” or “roll,” indicating that the size is derived from a roll width. It does not stand for “recycled” or “reduced.”
Is letter R used in any countries outside the US?
Occasionally, it may appear in countries that adopted ANSI standards, but it is essentially obsolete everywhere. The international community uses A-series sizes, so letter R is a purely North American historical artifact.