Which is larger, A3 or A4?

A3 is larger, with a surface area of 124740 mm², compared to 62370 mm² for A4. That is a difference of 100.0%.

Is A3 taller than A4?

Yes, A3 (420 mm) is taller than A4 (297 mm).

Units

Compare:

297 × 420 mm

With:

210 × 297 mm

Popular comparisons

70.7%

Reduced to 70.7%, A3 fits inside A4 without cropping. It fills A4 almost exactly, as both sheets share the same proportions.

The primary difference between A3 and A4 is that A3 is taller and wider (297 × 420 mm) compared to A4 (210 × 297 mm).

In terms of surface area, A3 is 100.0% larger than A4.

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.

An A4 piece of paper measures 210 × 297 mm or 8.3 × 11.7 inches. Cutting it in half will create two A5 sheets of paper. A4 is part of the A series.