ObWheel

Medical | Health & Fitness

iOS

ObWheel is a handy app that puts the traditional pregnancy dates wheel into the palm of your hand! ObWheel is useful for expectant parents as well as obstetricians, family physicians, nurses, midwives, and students. It uses the date of Last Menstrual Period (LMP) to calculate Estimated Due Date (EDD) and Gestational Age (GA). No more imprecise paper wheels - this tool is always at hand, in your pocket!

We've separated the outer and inner wheels to make it easy-to-use. Spin the green wheel to set the LMP date. Spin the purple wheel to browse important milestones, and to calculate the gestational age on a specific date (displayed in the middle).

Need to calculate the EDD from a dating ultrasound report? Rotate the purple wheel until the GA shown matches the GA on the ultrasound report. Then, rotate the green wheel until the date matches the date of the ultrasound. The EDD will be displayed below.

ObWheel is designed for the iPhone SE, 6S, and 6S Plus, but supports all devices from the iPhone 4S and up. It also works on your iPad and iPad Pro! We are continually working to improve ObWheel, and appreciate your feedback. Future features planned: leap day support; fetal biometry information; useful information for parents (e.g. dates of screening tests).