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Free Due-Date Calculator · OB Wheel
Enter the first day of your last period and we'll work out your estimated due date, how far along you are, and when your key antenatal checks fall — the same way the paper “OB wheel” does it.
Not the day you conceived — the day your last period started.
This is an estimate based on a standard 28-day cycle (Naegele's rule) — most babies arrive anywhere from 3 weeks early to 2 weeks after this date. Your first ultrasound may adjust it. This tool doesn't replace antenatal care.