Paper & layout
A4 vs US Letter: print a document without clipping the edges
Compare the actual dimensions, calculate fit percentages in both directions and account for margins instead of assuming the formats are interchangeable.
A4 is narrower and taller than US Letter. Use the smaller of the width and height scale factors to fit a whole page, then account for the printer’s usable area.
Begin with exact units
A4 is 210 × 297 millimeters. US Letter is 8.5 × 11 inches, which is exactly 215.9 × 279.4 millimeters. Letter is 5.9 mm wider; A4 is 17.6 mm taller. The difference is large enough to clip headers, footers or narrow columns when a page is printed at its original size.
Changing the paper name in a print dialog does not necessarily reflow the original document. A fixed-page PDF commonly needs scaling or a deliberate layout edit. A word processor may reflow text when you change the page setup, potentially changing pagination.
Fit A4 onto Letter
With zero planned margins, compare 215.9 ÷ 210 for width and 279.4 ÷ 297 for height. The smaller ratio is the height ratio, giving approximately 94.0741%. At that scale the A4 page is about 197.56 mm wide and 279.4 mm tall.
This is a geometric fit to the full sheet, not a promise that your printer can print to its edges. If the device has nonprintable margins, use its actual usable rectangle or enter a conservative margin before calculating. The fit percentage will decrease.
Fit Letter onto A4
For the reverse direction, compare 210 ÷ 215.9 and 297 ÷ 279.4. The width limits the fit, yielding approximately 97.2673%. The Letter page becomes 210 mm wide and about 271.76 mm tall, with extra height remaining on the sheet.
A “fill” setting uses the larger ratio instead. That covers the sheet but loses source content at the edges. Use fit for documents where every label or number must remain visible. Choose fill only when deliberate cropping is appropriate and you have inspected what disappears.
| Source → target | Fit scale | Limiting dimension |
|---|---|---|
| A4 → Letter | 94.0741% | Height |
| Letter → A4 | 97.2673% | Width |
Make room for actual margins
For a Letter target with a quarter-inch margin on each edge, the usable area is 8 × 10.5 inches, or 203.2 × 266.7 mm. An A4 source fits that area at about 89.7980%, limited by height. Centering leaves additional horizontal space beyond the specified minimum margin.
Use the same unit for the source, target and margin. Our print scaling tool subtracts the margin twice from each target dimension. It rejects margins that leave no positive usable width or height.
Proof before printing the full document
Inspect one page with content near every edge. Check whether the application and printer driver are both applying scaling; a second fit operation can make the result smaller than planned. If the document includes a scale drawing, barcode or physical template, confirm its particular size requirements rather than relying on visual fit.
When you control the original document, redesigning it for the intended paper size may preserve readability better than reducing the whole page. Scaling makes text and line weights smaller together. Keep the original and the print-ready variant clearly named.
Sources & further reading
These references support the definitions. The calculations and examples in this article are original; printer-specific requirements must be checked with your provider.
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