How Big Is A4 Paper? Size Comparison

A5 paper 210mm × 148mm × 0.1mm 0.71× of A4 paper (297mm)
US Letter paper 279.4mm × 215.9mm × 0.1mm 0.94× of A4 paper (297mm)
iPad Pro 12.9-inch 280.6mm × 214.9mm × 6.4mm 0.94× of A4 paper (297mm)

Closest match: iPad Pro 12.9-inch is 0.94× A4 paper (297mm).

Quick compare: A5 paper 0.71× · US Letter paper 0.94× · iPad Pro 12.9-inch 0.94×

A4 paper is 297mm long — slightly longer than US Letter paper (279.4mm) and close to a 12.9-inch iPad Pro.

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