The A-series consists of the most common set of paper sizes that are used in the UK, the most common sizes being A4 and A3.
You can see below a list of the sizes in mm, inches and pixels:
UK Paper Sizes in mm, inches and pixels.
UK Paper Sizes in MM
4A0 1682 x 2378 mm 2A0 1189 x 1682 mm A0 841 x 1189 mm A1 594 x 841 mm A2 420 x 594 mm A3 297 x 420 mm A4 210 x 297 mm A5 148 x 210 mm A6 105 x 148 mm A7 74 x 105 mm A8 52 x 74 mm A9 37 x 52 mm A10 26 x 37 mm UK Paper Sizes in Inches
4A0 66.2 x 93.6 in 2A0 46.8 x 66.2 in A0 33.1 x 46.8 in A1 23.4 x 33.1 in A2 16.5 x 23.4 in A3 11.7 x 16.5 in A4 8.3 x 11.7 in A5 5.8 x 8.3 in A6 4.1 x 5.8 in A7 2.9 x 4.1 in A8 2.0 x 2.9 in A9 1.5 x 2.0 in A10 1.0 x 1.5 in UK Paper Sizes in Pixels
4A0 4767 x 6740 px 2A0 3370 x 4767 px A0 2383 x 3370 px A1 1683 x 2383 px A2 1190 x 1683 px A3 841 x 1190 px A4 595 x 841 px A5 419 x 595 px A6 297 x 419 px A7 209 x 297 px A8 147 x 209 px A9 104 x 147 px A10 73 x 104 px