Pregnancy Due Date Calculator
Estimate your pregnancy due date and current week from the first day of your last menstrual period (LMP), using the standard 280-day method.
Estimated due date — only ~4% of babies arrive on the exact day; first-trimester ultrasound is the more reliable dating method.
Pregnancy milestones
This calculator is for general information only and is not medical advice. Follow your doctor or midwife for pregnancy dating and care.
Fertile window? Ovulation calculator · baby's age later: Age calculator · event countdown: Event countdown.
How to use
Choose LMP, conception, IVF transfer, or a doctor-provided EDD. For LMP, enter your usual cycle length so the 28-day default can be adjusted. The tool estimates your due date, current gestational age, and key milestones at weeks 12, 20, 28, 36 and 40.
FAQ
How is the due date estimated?
For LMP dating, the calculator adds 280 days and adjusts for cycle length beyond the 28-day default. It can also date from conception, an IVF transfer, or a doctor-provided EDD.
Is it medically exact?
No — it is an estimate. Only about 4% of babies arrive exactly on the due date, and first-trimester ultrasound is the more reliable dating method. Always follow your doctor or midwife.
What does "weeks pregnant" mean?
It is gestational age measured from the estimated pregnancy dating start. With a doctor-provided EDD, the calculator works backward from 40 weeks.
Can I save or share the milestone timeline?
Yes. Copy or download a text report with your due date, current week and key milestone dates — all generated locally in your browser.
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