OB Wheel (Pregnancy calculator)

The OB Wheel is now FREE! Web app version is also available, also FREE! Multi-function pregnancy calculator. Created by a board-certified ObGyn. Calculate dates of pregnancy: Last menstrual period (LMP). Estimated date of conception. Weeks gestational age (WGA). WGA obtained by ultrasound. Dating by IVF Embryo transfer. Calculate gestation by Crown-Rump length.