Standard photo sizes:
5"x7" (12.7 x 17.78 cm) - use ISO ratio
8"x10" (20.32 x 25.4 cm) - use 4:5 ratio
11"x14" (27.94 x 35.56 cm)
- use 4:5 ratio
16"x20"(40.64 x 50.8 cm)
- use 4:5 ratio
20"x24" (50.8 x 60.96 cm
- use 4:5 ratio
24"x36" (60.96 x 91.44 cm
- use 2:3 ratio
ISO* print sizes:
A5 (14.8 x 21 cm) - use ISO ratio
A4 (21 x 29.7 cm)
- use ISO ratio
A3 (29.7 x 42 cm)
- use ISO ratio
A2 (42 x 59.4 cm
- use ISO ratio
A1 (59.4 x 84.1 cm)
- use ISO ratio
Extra included sizes:
4"x6" (10.16 x 15.24 cm) - use 2:3 ratio
6"x8" (15.24 x 20.32 cm) - use 3:4 ratio
8.5"x11" (21.59 x 27.94 cm) - use 3:4 ratio
8"x12" (20.32 x 30.48 cm) - use 2:3 ratio
9"x12" (22.86 x 30.48 cm) - use 3:4 ratio
10"x15 (25.4 x 38.1 cm) - use 2:3 ratio
12"x12" (30.48 x 30.48 cm) - use square ratio
12"x16" (30.48 x 40.64 cm) - use 3:4 ratio
12"x18" (30.48 x 45.72 cm) - use 2:3 ratio
16"x16" (40.64 x 40.64 cm) - use square ratio
18"x24" (45.72 x 60.96 cm) - use 3:4 ratio
20x20" (50.8 x 50.8 cm) - use square ratio
20x28" (50.8 x 71.12 cm) - use 3:4 ratio
20x30" (50.8 x 76.2 cm) - use 2:3 ratio