Dimensions of the A series paper sizes 4A0, 2A0, A0, A1, A2, A3, A4, A5, A6, A7, A8, A9 and A10 in both inches and mm, cm measurements can be obtained. An A6 piece of paper measures 105 × 148 mm or 4. A6 measures 105 × 148 millimeters or 4. Popular paper sizes and printing formats: A0, A1, A2, A3, A4, A5, A6, A7, A8. "A" Series Paper Size Explained | A0, A1, A2, A3, A4, A5, A6, A7, A8, Paper Size.