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What are international envelope sizes?

We use the ISO metric system for envelopes. It has been created to match the paper sizes. Essentially an A4 piece of paper will fit flat into a C4 envelope or folded in half it will fit into a B4.

SizeDimensionsSizeDimensions
C3   324 x 458B6125 x 176
B4 250 x 353C6114 x 162
C4  229 x 324DL110 x 220
B5  176 x 250C7/681 x 162
C5 162 x 229C781 x 114
B6/C4 324 x 176