Paper Size comparison tool
A
A3
297 x 420 mm
B
B4
250 x 353 mm
What is the difference between A3 and B4?
The primary difference between A3 and B4 is that A3 is taller and wider (297 × 420 mm) compared to B4 (250 × 353 mm).
In terms of surface area, A3 is 41.3% larger than B4.
An A3 piece of paper measures 297 × 420 mm or 11.7 × 16.5 inches. Cutting it in half will create two A4 sheets of paper. A3 is part of the A series.
A B4 piece of paper measures 250 × 353 mm or 9.8 × 13.9 inches. Cutting it in half will create two B5 sheets of paper. B4 is part of the B series.