C3 Envelope Paper Size, Dimensions and Format (International Envelope series)

C3 Envelope in millimeters

458 x 324


C3 Envelope-paper-size


Aspect ratio 1.41:1
Area (A) 148,392 mm²
Perimeter (P) 1,564 mm
Diagonal (d) 561.02 mm


The C3 Envelope format measures 458 x 324 mm or 18 x 12.8 inches. An C3 Envelope paper fromat has an aspect ratio of 1.41:1. The Area of the C3 Envelope paper size is 148,392 mm² or 230.40 in² with a perimeter of 1,564 mm or 61.60 in. An C3 Envelope format has a diagonal length of 561.02 mm or 22.09 in. The C3 Envelope size belongs to the International Envelope series. In the International Envelope series there are a total of 12 paper sizes.

Frequently Asked Questions:

The size of an C3 Envelope paper is 458 x 324 mm

The size of an C3 Envelope paper in inches is 18 x 12.8 in

The half size of an C3 Envelope paper is 229 x 162 mm or 9 x 6.4 in

The aspect ratio of an C3 Envelope is 1.41:1

The area of an C3 Envelope paper is 148,392 mm or 230.40 in

The perimeter of an C3 Envelope paper is 1,564 mm or 61.60 in

The diagonal measurement of C3 Envelope paper is 561.02 mm or 22.09 in

Other International Envelope Paper Sizes

There are a total of 12 International Envelope Paper Sizes.