Dimensions

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ISO 269 describes the C series paper. C series is typically used to define envelope sizes and is closely related to both A and B series paper. Since both A and B paper are widely used, it makes sense to size envelopes for that paper. For example, folding an A4 sized piece of paper in half will fit sngly into a C5 sized envelope.

FormatWidth × Height (mm)Width × Height (cm)Width × Height (in)
C0917 × 1297 mm91.7 × 129.7 cm36.1 × 51.1 in
C1648 × 917 mm64.8 × 91.7 cm25.5 × 36.1 in
C2458 × 648 mm45.8 × 64.8 cm18 × 25.5 in
C3324 × 458 mm32.4 × 45.8 cm12.8 × 18 in
C4229 × 324 mm22.9 × 32.4 cm9 × 12.8 in
C5162 × 229 mm16.2 × 22.9 cm6.4 × 9 in
C6114 × 162 mm11.4 × 16.2 cm4.5 × 6.4 in
C781 × 114 mm8.1 × 11.4 cm3.2 × 4.5 in
C857 × 81 mm5.7 × 8.1 cm2.2 × 3.2 in
C940 × 57 mm4.0 × 5.7 cm1.6 × 2.2 in
C1028 × 40 mm2.8 × 4.0 cm1.1 × 1.6 in