How to use it
- Find your format in the table: ISO A and B series or North American sizes.
- Read the dimensions in millimeters, inches or pixels at 300 DPI for print-ready files.
- Choose a size in the preview box to see its outline at actual scale (calibrate the ruler first).
Frequently asked questions
What size is A4?
A4 is 210 × 297 mm, or about 8.27 × 11.69 inches. It is the standard office paper in most of the world.
Why do A sizes fit inside each other?
Each A size has a 1:√2 ratio, so cutting a sheet in half gives the next size with the same proportions. A0 has an area of one square meter.
Is US Letter the same as A4?
No. Letter is 8.5 × 11 inches (215.9 × 279.4 mm): slightly wider and shorter than A4.