Vue d’ensemble
A3 paper measures 297 × 420 mm, or about 11.69 × 16.54 inches. It is exactly twice the area of A4, which makes it useful for posters, wall charts, diagrams, and proof sheets that need more room than a standard office page.
A3 is close to US 11×17 Tabloid, but it is not interchangeable. Use the exact page size in your PDF and print at 100 percent scale so metric grids, margins, and labels do not drift.
Modèles imprimables et hubs
Utilisez ces pages imprimables comme les destinations internes les plus pertinentes pour ce format, ce workflow ou cette intention de mise en page.
Papier millimétré 10 mm
Papier quadrillé 10 mm pour maths élémentaire et graphiques simples
A4 Grid 5mm
A4 5mm grid, common for STEM notes
Papier comptable
Quadrillage en colonnes pour comptabilité et tenue de livres
Graph & grid paper
Quarter-inch grids, engineering paper, coordinate planes, and specialty math layouts.
other paper
Parcourez des modèles imprimables et filtres associés pour ce cluster de formats.
Articles complémentaires
A3 Paper Size in Inches: 11.69 x 16.54 in (297 x 420 mm)
A3 paper measures 11.69 x 16.54 inches, or 297 x 420 mm. Compare A3 vs A4 and 11x17, then print posters, charts, and proofs without scaling.
A3 vs A4 Paper: Size, Printing, and Which to Choose
A3 is 297 x 420 mm, exactly twice the area of A4. Compare A3 vs A4, choose the right size, and avoid print scaling mistakes.
Paper Sizes: ISO vs ANSI, Letter, Legal, A4, and 11x17
Compare ISO and North American paper sizes: A4, A3, Letter, Legal, Tabloid, Ledger, and 11x17. Choose the right size before exporting PDFs.
Questions fréquentes
What is A3 paper size in inches?OPEN
A3 paper is about 11.69 × 16.54 inches.
What is A3 paper size in millimeters?OPEN
A3 paper is 297 × 420 mm.
Is A3 the same as 11x17?OPEN
No. A3 is 297 × 420 mm, while 11x17 Tabloid is 279.4 × 431.8 mm. They are close enough to confuse, but not interchangeable for scale-sensitive printables.