120×200

120×200 describes a two-dimensional size, indicating width and height. The units are not specified, so interpretation depends on context. In metric usage, it most often denotes millimetres, giving 120 mm by 200 mm, which equals 12 cm by 20 cm. In digital contexts, it could represent 120 by 200 pixels. The aspect ratio is 120:200, which simplifies to 3:5.

When expressed in millimetres, a 120×200 mm rectangle has an area of 24,000 square millimetres (240 square centimetres). The diagonal length can be calculated with the Pythagorean theorem: sqrt(120^2 + 200^2) ≈ 233 mm (about 23.3 cm). In inches, this size corresponds to approximately 4.72 by 7.87 inches.

Common uses for 120×200 mm (12×20 cm) sizes include small prints, photos, labels, or promotional cards. The 3:5 aspect ratio is used in some design templates and niche printing workflows, though it is not part of the standard ISO paper size series (which includes formats such as A-series and B-series). As a general rule, the exact interpretation of 120×200 depends on the units specified and the intended application, so it is important to confirm units when applying the dimension to real-world projects.

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