Which is larger, A3 or B4?

A3 is larger, with a surface area of 124740 mm², compared to 88250 mm² for B4. That is a difference of 41.3%.

Is A3 taller than B4?

Yes, A3 (420 mm) is taller than B4 (353 mm).

Units

Compare:

297 × 420 mm

With:

250 × 353 mm

Popular comparisons

84%

Reduced to 84%, A3 fits inside B4 without cropping. It fills B4 almost exactly, as both sheets share the same proportions.

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.