How Big Is 5.5 x 8.5? | Half Letter Size Explained

5.5 x 8.5 inches is the Half Letter paper size, measuring 140 x 216 mm and commonly used for planners, notebooks, and small booklets.

Whether you’re picking paper for a custom planner or checking a printer’s paper tray, knowing the exact dimensions of 5.5 x 8.5 inches saves you from ordering the wrong size. This size is known as Half Letter in U.S. paper terminology — and it’s a common source of confusion because some manufacturers label it Statement instead. The name varies; the dimensions don’t.

What Are The Exact Dimensions?

The precise measurements are 5.5 inches wide by 8.5 inches tall in U.S. usage. When converted to metric, you’ll see two slightly different numbers depending on the reference: some sources round to 140 x 216 mm, while others list the more precise 139.7 x 215.9 mm. Both describe the same physical sheet.

Here’s how Half Letter fits among the standard U.S. paper sizes:

The size sits comfortably between Junior Legal and Letter, making it a natural middle ground for printed materials that need more room than a note card but less than a full sheet.

What Is 5.5 x 8.5 Commonly Used For?

Half Letter’s compact footprint makes it a favorite for personal and small-format printing. You’ll find it most often in personal planners and refill inserts, where the size keeps binders portable without cramping the writing space. Small booklets, notepads, and custom forms also use these dimensions because they fold neatly and store easily.

For photo printing, 5.5 x 8.5 inches works well for postcards and smaller flyers. If you’re planning to display one, a roundup of the best 5.5 x 8.5 frames is worth checking before you print, so your finished piece fits a ready-made frame without custom sizing.

Is 5.5 x 8.5 The Same As A5?

No — this is the most common mix-up. A5 paper measures approximately 5.8 x 8.3 inches (148 x 210 mm), which is close but not identical to Half Letter. A5 is slightly wider and slightly shorter.

The difference matters for two reasons:

• Printers: U.S. printers typically offer Half Letter (5.5 x 8.5) as a tray option; A5 is a metric standard more common in international machines.
• Planner inserts: A5 planner owners need A5-specific inserts. Forcing Half Letter pages into an A5 binder rarely fits cleanly.

Check the product listing before buying inserts or paper. A five millimeter difference in width is enough to make a sheet sit crooked in a binder or a frame.

Why Do Names For 5.5 x 8.5 Differ?

Some U.S. references — including PaperSizes.org’s U.S. size guide — list this sheet as Half Letter, while others call it Statement or Memo. All three names can refer to the same 5.5 x 8.5 inch sheet, depending on the manufacturer or the printer driver you’re using.

This naming inconsistency causes real confusion. When you’re ordering paper or setting up a print job, look for the numeric dimensions rather than trusting the label alone. A product called “Statement” and one called “Half Letter” may be identical — but checking the stated size in inches removes all doubt.

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