Reference library
Half Letter Paper Size
Half Letter measures 139.7 x 215.9 mm, 13.97 x 21.59 cm, or 5.5 x 8.5 in. See pixel dimensions by DPI, aspect ratio, bleed setup, comparisons, and related tools.
Last checked: 2026-05-01
How we calculate this
Methodology and source handling
We convert physical sizes to inches, multiply by the selected DPI/PPI value, and round to whole pixels.
Quick answer
Copy-ready answer
Half Letter is 139.7 x 215.9 mm, 13.97 x 21.59 cm, or 5.5 x 8.5 in. At 300 DPI, Half Letter is 1650 x 2550 px.
Dimensions and specs
| Millimeters | 139.7 x 215.9 mm | |
|---|---|---|
| Centimeters | 13.97 x 21.59 cm | |
| Inches | 5.5 x 8.5 in | |
| 300 DPI pixels | 1650 x 2550 px | |
| Aspect ratio | 1:1.5455 | |
| Standard family | North American Office |
Pixels
Pixel dimensions by DPI
| DPI / PPI | Width | Height | Use |
|---|---|---|---|
| 72 DPI | 396 px | 612 px | Screen or draft reference density |
| 96 DPI | 528 px | 816 px | Screen or draft reference density |
| 150 DPI | 825 px | 1275 px | Screen or draft reference density |
| 300 DPI | 1650 px | 2550 px | Common high-quality print setup |
| 600 DPI | 3300 px | 5100 px | High-resolution archival or print workflow |
Formula
How to calculate this size
139.7 mm x 300 PPI = 1,650 px wide.
Use this when the artwork stops at the finished edge.
Add 3 mm per side before calculating pixels when artwork reaches the edge.
Common mistakes
Avoid these half letter paper size problems
A paper size needs a PPI target before pixels mean anything for print.
Portrait and landscape use the same dimensions, but width and height swap in the export.
Paper pages show trim size first; add bleed only when the design prints to the edge.
Calculator
Calculate pixels and bleed
Enter any DPI to calculate the pixel dimensions for this physical size.
Compare
Compare Half Letter Paper Size
Open a curated comparison or send both sizes into the compare tool with a fragment URL.
- Half Letter Paper Size
- 139.7 x 215.9 mm
- Statement
- 139.7 x 215.9 mm
- Half Letter Paper Size
- 139.7 x 215.9 mm
- A4
- 210 x 297 mm
- Half Letter Paper Size
- 139.7 x 215.9 mm
- US Letter
- 215.9 x 279.4 mm
Workflow
Use Half Letter Paper Size in a finished file
Copy the millimeter, centimeter, or inch dimensions for the selected paper standard.
Use 300 PPI for most sharp print exports, or match the printer requirement.
Multiply inches by PPI, then add bleed only when artwork reaches the trimmed edge.
Related
Related pages and tools
Same branch
Nearby pages
FAQ
Common questions
What is the exact Half Letter size?
Half Letter measures 139.7 x 215.9 mm, 13.97 x 21.59 cm, or approximately 5.5 x 8.5 in.
What is Half Letter in pixels at 300 DPI?
Half Letter at 300 DPI is 1650 x 2550 px when rounded to the nearest whole pixel.
What aspect ratio is Half Letter?
Half Letter has an aspect ratio of about 1:1.5455 based on its 139.7 x 215.9 mm physical dimensions.
Should I add bleed to a Half Letter design?
For print work, a common starting point is 3 mm bleed on each side, making the document 145.7 x 221.9 mm before trimming. Confirm final bleed with your printer.
References
Sources and references
North American office paper standards physical dimensions. Pixel values are calculated from millimeters / 25.4 x DPI and rounded to whole pixels.
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HP paper size reference
Used as a reputable printer reference for North American office, ANSI, and envelope dimensions.
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W3C CSS Values and Units Module
Used for CSS unit definitions, absolute unit relationships, and CSS px behavior.
Last checked: 2026-05-01