A-series reference
A4 paper size (210 × 297 mm → 8.27 × 11.69 in)
A4 has nominal trimmed dimensions of 210 × 297 mm, approximately 8.27 × 11.69 inches.
Maintained by mmtoinches.im · Updated
NIST describes the standard inch as exactly equivalent to 25.4 mm
. NIST length definition. ISO 216 — A and B series paper sizes. Method and limitations.
A4 is the most common ISO paper size. Below you will find rounded inch conversions, aspect ratio notes, printable area guidance, and tips for sending A4 files to US Letter printers without losing content.
Dimensions
- Millimeters: 210 mm × 297 mm
- Inches: 8.27 in × 11.69 in
Print and export tips
On US Letter printers, choose Fit to printable area and inspect the print preview. Fitting the full 297 mm A4 height into 279.4 mm Letter height requires about 94.1 percent scale before printer margins. Keep important content inside the printable area; commercial bleed is a separate setting, and binding may require extra inner margins.
Common uses
Office and school
Default size for reports, worksheets, and documentation in most countries.
Design and print
Brochures, resumes, menus, and handouts; export at 300 dpi for clean edges.
A4 vs Letter
Letter is wider and shorter, so keep footer text away from the edge when printing cross-region.
Print-resolution, bleed and margin examples are starting points, not ISO paper-size requirements. Follow the printer or publisher’s specifications; vector PDF content does not have a single image DPI.
Frequently Asked Questions
A4 is 210 × 297 millimeters, approximately 8.27 × 11.69 inches. It keeps the 1:sqrt(2) aspect ratio used by the ISO A-series.
Letter (8.5 × 11 in) is wider and shorter than A4. Choose Fit to printable area and verify the preview against your printer margins. Full-page A4 to Letter scaling is about 94.1 percent before accounting for unprintable margins; keep important content inside the printable area.
Export at 210 × 297 mm, at least 300 dpi for print. If you plan duplex printing, add mirrored inner margins so spine text does not creep inward.
Sources and calculation notes
A4 has nominal trimmed dimensions of 210 × 297 mm, approximately 8.27 × 11.69 inches.
Method: Divide millimeters by 25.4 to obtain inches. The factor is exact; displayed decimal values are rounded. Fractional inches are rounded to the selected denominator.
Scope: The mm dimensions are nominal ISO trimmed sizes; inch values are rounded. Add bleed or printer margins separately.
Content maintained by mmtoinches.im. Updated and reference notes reviewed . How we calculate and present measurements. Sources support the stated definitions; examples and calculators are not certification of a product or compliance with a standard.