105×148

105×148 commonly refers to the A6 paper size, defined as 105 millimeters by 148 millimeters. This size is part of the ISO 216 standard’s A-series, which uses a constant aspect ratio of the square root of 2.

The A-series sizes share a characteristic: when you cut a sheet parallel to its shorter side, you obtain the next smaller size. A6 is half the area of A5, which is half of A4. For reference, A4 measures 210 × 297 mm.

In terms of area and units, 105 × 148 equals 15,540 square millimeters, or 155.4 square centimeters, which is 0.01554 square meters. In inches, the dimensions are about 4.13 × 5.83 inches, giving an area of roughly 24.1 square inches.

Common uses for A6 include postcards, small notepads, greeting cards, invitations, and pocket-sized organizers. Its compact dimensions make it convenient for handheld documents and carry-along stationery.

The A-series standard was formalized as ISO 216 in 1975, building on earlier DIN standards and the principle of preserving the sqrt(2) aspect ratio across sizes. Today, A6 is widely employed internationally for printing and publishing, facilitating consistent sizing across forms, envelopes, and printers.