Which is larger, A3 or Letter?

A3 is larger, with a surface area of 124740 mm², compared to 60322.46 mm² for Letter. That is a difference of 106.8%.

Is A3 taller than Letter?

Yes, A3 (420 mm) is taller than Letter (279.4 mm).

Compare:

297 × 420 mm

With:

Letter

216 × 279 mm

Sheets shown to the same proportional scale

66.5%

Reduced to 66.5%, A3 fits inside Letter without cropping. This fills the full height of Letter and leaves 18 mm of blank space across the width.

The primary difference between A3 and Letter is that A3 is taller and wider (297 × 420 mm) compared to Letter (216 × 279 mm).

In terms of surface area, A3 is 106.8% larger than Letter.

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 Letter piece of paper measures 216 × 279 mm or 8.5 × 11 inches. Letter is part of the US series.