Ob Wheel

Ob Wheel is a multi-functional gestational age and due date (EDD) calculator designed to replace paper or plastic obstetrical wheels. It computes gestational age quickly using inputs such as last menstrual period (LMP), ultrasound measurements, crown-rump length (CRL), IVF dates and more. The app also generates editable timelines and templates, estimates fetal length and weight, and highlights pregnancy milestones, terms and fun extras like baby fruit/vegetable size and zodiac for EDD.

Built for clinicians but intuitive for anyone, Ob Wheel works offline and offers an ad-free experience through rewards. Additional modules include hCG doubling time, Institute of Medicine (IOM) pregnancy weight gain comparison by BMI, Bishop scoring and discrepancy checks between LMP and ultrasound dates. Results can be copied to clipboard or shared as images. Available in English, Spanish, Turkish, German, French, Italian and Portuguese. Disclaimer: informational only—not a substitute for professional medical advice.