Half Letter paper size
139.7 × 215.9 mm
5.5 × 8.5 inches · 13.97 × 21.59 cm · aspect ratio 1:1.55
Half Letter size is 139.7 × 215.9 mm. Those are the Half Letter dimensions a printer works to; the same sheet in centimetres, inches, points and pixels is below.
What Half Letter is for
Half Letter, 5.5 × 8.5 inches, is a Letter sheet folded once, and the North American equivalent of A5. Planners, personal organisers and small notepads use it, and it is the usual page size for a booklet printed two-up on Letter stock.
Half Letter dimensions in every unit
| Unit | Width | Height |
|---|---|---|
| Millimetres | 139.7 mm | 215.9 mm |
| Centimetres | 13.97 cm | 21.59 cm |
| Inches | 5.5 in | 8.5 in |
| Points (PostScript) | 396 pt | 612 pt |
Half Letter in pixels
Pixel dimensions depend entirely on the resolution you are working at — there is no single "pixel size" for a sheet of paper. Half Letter size in pixels has every resolution, with file sizes and canvas setup.
| Resolution | Pixels | Use |
|---|---|---|
| 72 DPI | 396 × 612 | Screen preview only — far too coarse to print |
| 150 DPI | 825 × 1275 | Draft printing, internal documents |
| 300 DPI | 1650 × 2550 | The standard for commercial print |
| 600 DPI | 3300 × 5100 | Fine detail, line art, archival scanning |
Setting up a print document? Use 300 DPI and add 3 mm of bleed on every edge unless your printer specifies otherwise.
How Half Letter relates to the rest of the series
This sheet is about the area of a single Letter sheet, at 139.7 × 215.9 mm.
Its aspect ratio is 1:1.545. This is where the US system differs from A sizes in a way that matters: the A series keeps a constant 1:1.414 through every fold, while doubling a Letter-based sheet alternates between roughly 1:1.29 and 1:1.55. A drawing scaled from one ANSI size to the next therefore does not fill the sheet the way an A-series drawing does, and something always has to be cropped or padded.
That single difference is why documents laid out for one system never move cleanly to the other, and why a "fit to page" print from Letter to A4 leaves uneven margins rather than simply shrinking.
About Half Letter
5.5 × 8.5 inches — Letter folded once. Used for booklets, planners and small notepads.
Letter vs A4
Letter is 6 mm wider and 18 mm shorter than A4. That small difference is why a PDF laid out for A4 prints with clipped edges or unexpected margins on US paper, and why "Fit to page" exists in every print dialog. There is no scaling factor that makes them match — the aspect ratios genuinely differ (1:1.294 for Letter, 1:1.414 for A4).
Other North American sizes
| Size | Millimetres | Inches |
|---|---|---|
| Letter | 215.9 × 279.4 mm | 8.5 × 11 in |
| Legal | 215.9 × 355.6 mm | 8.5 × 14 in |
| Tabloid | 279.4 × 431.8 mm | 11 × 17 in |
| Executive | 184.15 × 266.7 mm | 7.25 × 10.5 in |
| Junior Legal | 127 × 203.2 mm | 5 × 8 in |
| ANSI C | 431.8 × 558.8 mm | 17 × 22 in |
| ANSI D | 558.8 × 863.6 mm | 22 × 34 in |
| ANSI E | 863.6 × 1117.6 mm | 34 × 44 in |
Frequently asked questions
What size is Half Letter in mm?
139.7 × 215.9 mm.
What size is Half Letter in inches?
5.5 × 8.5 inches.
What size is Half Letter in pixels?
There is no single answer — it depends on resolution. At the print standard of 300 DPI it is 1650 × 2550 pixels; at 72 DPI it is only 396 × 612.