How big are American girl dolls around?

Measurements taken on American Girl doll, Gwen

Doll has tightly stuffed cloth body and vinyl arms, legs, head, and sleep eyes

Chest - 11.75 inches (29cm)

Waist - 11.5 inches (28.5 cm)

Hips - 12 inches (30cm)

Across shoulders - 4.5 inches (10.5cm)

Shoulder to waist - 5 inches (13cm)

Top of arms - 4.75 inches (13cm)

Circumference of lower arm - 4.5 inches (11.5cm)

Waist to below knees - 7.25 inches (18cm)

Waist to ankles - 9.5 inches (24cm)

Girth - 17.25 inches (43.5cm)

Head, as if wearing a beret - 12.5 inches (32cm)

Neck - 7 inches (18cm)

Inseam - 5.5 inches (14cm)

Calf circumference - 5.25 inches (13cm)

Ankle circumference - 4.25 inches (10cm)

Length from just below knee to ankle - 3 inches (7.5cm)

See the related link for further information.