A0, A1, A2, A3 and A4 paper sizes
The sizes every drawing, plotter and print room works in, from the international standard ISO 216.
Do it now with batchprint.co.ukFree in your browser. Your files stay on your computer.Open the tool →| Size | Millimetres | Area | Typical use on a job |
|---|---|---|---|
| A0 | 841 × 1189 | 1 m² | Site plans, large general arrangements |
| A1 | 594 × 841 | ½ m² | Most architectural and structural drawings |
| A2 | 420 × 594 | ¼ m² | Details, smaller sites |
| A3 | 297 × 420 | ⅛ m² | Site copies, reduced sets, programmes |
| A4 | 210 × 297 | 1/16 m² | Letters, RAMS, schedules, specifications |
How they fit together
- A0 is one square metre. Each size down is the one above cut in half across its long side.
- Every A size has the same shape, a ratio of 1 to √2 (about 1 : 1.414), which is why a drawing can be reduced from one size to another without cropping.
- Going down two sizes halves every length: A1 to A3 is exactly 50%, so 1:50 becomes 1:100. See printing A1 drawings on A3.
Sorting a set by size
batchprint.co.uk reads each PDF's page size and sorts the set into A0, A1, A2, A3 and A4 folders (within 2.5%, so a sheet a millimetre out still counts), ready to send each size to the right printer.
Questions
What size is A1 in mm?
594 × 841 mm.
What size is A3 in mm?
297 × 420 mm.
What size is A0 in mm?
841 × 1189 mm, one square metre.