PAPER ATLAS

C Envelopes

Envelope set designed around A-series folds.

5 sizes indexedBack to Index

Count

5 Sizes

Largest

C3

324 x 458 mm

Smallest

C6

114 x 162 mm

C3

UseEnvelope for unfolded A3 sheets.
MM324 x 458
IN12.76 x 18.03
CM32.40 x 45.80

C4

UseEnvelope for unfolded A4 pages.
MM229 x 324
IN9.02 x 12.76
CM22.90 x 32.40

C5

UseEnvelope for A5 or folded A4.
MM162 x 229
IN6.38 x 9.02
CM16.20 x 22.90

DL

UseStandard folded-letter envelope format.
MM110 x 220
IN4.33 x 8.66
CM11.00 x 22.00

C6

UseEnvelope for A6 cards.
MM114 x 162
IN4.49 x 6.38
CM11.40 x 16.20

C Envelopes Size Diagram

Visual Scale
W: 12.76 inH: 18.03 in
C3
W: 9.02 inH: 12.76 in
C4
W: 6.38 inH: 9.02 in
C5
W: 4.33 inH: 8.66 in
DL
W: 4.49 inH: 6.38 in
C6
C312.76 in x 18.03 in
C49.02 in x 12.76 in
C56.38 in x 9.02 in
DL4.33 in x 8.66 in
C64.49 in x 6.38 in

C Envelopes Reference Table

All Sizes
NameWidth (mm)Height (mm)Width (cm)Height (cm)Width (in)Height (in)
C332445832.4045.8012.7618.03
C422932422.9032.409.0212.76
C516222916.2022.906.389.02
DL11022011.0022.004.338.66
C611416211.4016.204.496.38

The Story ofC Envelopes

History + Culture

C Envelopes are engineered around A Series logic. The system is intentionally practical: a folded A4 slips into C5, while an unfolded A4 fits C4. That simple compatibility is why C sizes became a backbone of international mailing workflows.

In real production environments, C formats make fulfillment predictable. Marketing teams, legal offices, and agencies rely on these pairings to avoid awkward folds and damaged edges.

Learn More External visual guide · opens in a new tabVisualize C envelope fitsSee C4, C5, C6, and DL envelopes alongside the sheets and folds they hold.