Size of Gestational Sac (GS) Select Gestational age 5w 6w 7w 8w 9w 10w 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 Gestational Sac mm Size in the area of the light blue is standard Size of CRL Due Date Calculator Fertility Checker