Listed below is a range of useful information to help with sizes when ordering.
PAPER SIZES
Type mm
A0 ... 841 × 1189
A1 ... 594 × 841
A2 ... 420 × 594
A3 ... 297 × 420
A4 ... 210 × 297
A5 ... 148 × 210
A6 ... 105 × 148
Imperial : Metric
1 inch : 25.4 mm
1 foot : 305 mm
Planning A Frame Click: Moulding Qty Guide