What is A3 in inches?

A3 is 297 × 420 millimeters, which equals 11.69 × 16.54 inches. It keeps the 1:sqrt(2) aspect ratio and has double the area of A4.

How does A3 compare to Tabloid 11×17?

Tabloid is 279.4 × 431.8 mm (11 × 17 in), slightly wider and taller than A3. When printing A3 art on a Tabloid device, use Scale to fit and center to avoid clipping.

What bleed and resolution should I use for A3 posters?

Add at least 3 mm bleed on all sides and keep a 5–8 mm safe zone for text. Export at 300 dpi or higher in CMYK for crisp digital or inkjet output.

A-series reference

A3 paper size (297 × 420 mm → 11.69 × 16.54 in)

A3 is a versatile size for posters, diagrams, and folded brochures. Use the conversions below to set up A3 files in inches, see how it differs from Tabloid 11×17, and apply bleed plus resolution guidelines for print-ready exports.

297 × 420 mm11.69 × 16.54 inPoster ready

Dimensions

Millimeters: 297 mm × 420 mm
Inches: 11.69 in × 16.54 in
Area: about 0.1247 m² (193.0 in²), twice A4
Ratio: 1:sqrt(2), doubles or halves cleanly when combined with other A sizes

Print setup tips

For fold-out brochures, leave 2–3 mm at the fold for trimming. Printing on a Tabloid (11×17) device? Choose Scale to fit and center align to keep the full design.

Open mm to inches converter View conversion chart

Common uses

Posters and notices

Great size for store signage, event posters, and quick visual displays that stay portable.

Design drafts

Handy for architectural diagrams, product sketches, and review prints with more room than A4.

A3 vs Tabloid

Tabloid is a bit wider and taller; center the artwork and let the printer scale to fit to avoid stretch.