Size of paper a3
- A3 paper size in millimetres is 297 mm x 420 mm.
- A3 paper size in inches is 11.7 in x 16.5 in.
Envelopes for a3 paper
- For an unfolded a3 you will need an c3 envelope.
- Fold the a3 paper once – c4 envelope.
More A papers formats
See all paper sizes in A series.