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C3 Paper Size Dimensions

C3

324 × 458 mm

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A C3 envelope measures 324 × 458 mm or 12.8 × 18.0 inches. An A3 piece of paper will fit into a C3 envelope. C3 is part of the C series, most commonly used for envelopes, and is defined by the ISO 269 paper size standard.

All C Envelope Series Paper Sizes →

C0 917 × 1297 mm C1 648 × 917 mm C2 458 × 648 mm C3 324 × 458 mm C4 229 × 324 mm C5 162 × 229 mm C6 114 × 162 mm C7 81 × 114 mm C8 57 × 81 mm C9 40 × 57 mm C10 28 × 40 mm