Here's a size guide chart for Amelia Jayne’s A3, A2, and A1 prints. This chart includes the dimensions in both centimetres and inches::

---

A3 | 29.7 x 42 cm | 11.7 x 16.5 inches

A2 | 42 x 59.4 cm | 16.5 x 23.4 inches

A1 | 59.4 x 84.1 cm | 23.4 x 33.1 inches