Need to convert sizes that you'll see on our site? Look no further, we've put together a handy guide for the common sizes you'll find on CraftStash.

A series 

	mm	cm	inches
A3	420 x 297 mm	42.0 x 29.7 cm	11¾ x 16½ in
A4	297 x 210 mm	29.7 x 21.0 cm	11¾ x 8¼ in
A5	210 x 148 mm	21.0 x 14.8 cm	8⅓ x 5.8 in
A6 (Postcard)	148 x 105 mm	14.8 x 10.5 cm	5.8 x 4.1 in

C series (envelopes)

C4 (to hold A4)	324 x 229 mm	32.4 x 22.9 cm	9.0 x 12.8 in
C5 (to hold A5)	229 x 162 mm	22.9 x 16.2 cm	6.4 x 9.0 in
C6 (to hold A6)	162 x 114 mm	16.2 x 11.4 cm	4½ x 6.4 in

American sizes

Letter	279.4 x 215.9 mm	27.94 x 21.59 cm	11 x 8½ in
A2 (half letter)	139.7 x 108 mm	13.97 x 10.8 cm	5½ x 4¼ in

Other common sizes 

6x6	152 x 152 mm	15.2 x 15.2 cm	6 x 6 in
6x4	152 x 101 mm	15.2 x 10.1 cm	6 x 4 in
5x7	127 x 178 mm	12.7 x 17.8 cm	5 x 7 in
8x8	203 x 203 mm	20.3 x 20.3 cm	8 x 8 in

We've made a short video summarising the differences between UK & US paper sizes: