A3 (420 x 297mm) 16.5 ” x 11.7 ” Approx. A3 (Overall Size 13.5" x 18.75" Approx.). A4 (210 x 297mm) 8.3 ” x x11.7” Approx. A4 (Overall Size 10.1" x 13.5" Approx.). We are more than confident though that you will be delighted with the quality.