Crown Rump Length (CRL) Select Gestational age 7w 8w 9w 10w 11w 12w 0d 1d 2d 3d 4d 5d 6d 0d 1d 2d 3d 4d 5d 6d 0d 1d 2d 3d 4d 5d 6d 0d 1d 2d 3d 4d 5d 6d 0d 1d 2d 3d 4d 5d 6d 0d 1d 2d 3d 4d 5d 6d CRL mm Size in the area of the light blue is standard Size of Gestational Sac Due Date Calculator Fertility Checker