Paper Size Converter
Nearest A-size match: —
Enter Size (Millimetres)
Tip: Add 3 mm bleed on all sides for edge-to-edge designs.
Enter Size (Inches)
Switch units freely—values stay in sync both ways.
Millimetres (mm)
Width: 210.00 mm
Height: 297.00 mm
Inches (in)
Width: 8.268 in
Height: 11.693 in
Centimetres (cm)
Width: 21.00 cm
Height: 29.70 cm
Pixels @ 300 DPI
W: 2481 px
H: 3508 px
Pixels @ 150 DPI
W: 1240 px
H: 1754 px
Aspect Ratio
1.413 : 1 (long : short)
Nearest A-size: —
How these calculators help
Use the Paper Size Converter to switch between ISO A-sizes and free-form inputs in mm and inches—both directions stay in sync, and we suggest the nearest A-size. For covers, add 3 mm bleed on all sides and keep critical text 3–5 mm inside the trim. The Spine Width Calculator enforces page counts in multiples of 4 (min 4) and lets you choose specific GSM sets for Coated or Uncoated stocks, or enter a custom caliper when you have mill data.