Standard Envelope sizes

What are the standard paper and envelope sizes?

 

Standard UK Paper Sizes

Sheet Size

Millimetres

A0

821 x 1189

A1

594 x 841

A2

420 x 594

A3

297 x 420

A4

210 x 297

A5

148 x 210

A6

105 x 148

A7

74 x 105

 

Standard UK Envelope Sizes

Size

Millimetres

Fits sheet sizes

C4

229 x 342

Takes A4 sheets flat

C5

162 x 229

Takes A5 sheets flat or A4 folded once

C6

114 x 162

Takes A6 or A5 folded once

DL

110 x 220

Takes A4 folded twice into thirds

C7

81 x 162

Takes A7 or A6 folded once