Pregnancy Due Date Calculator (EDD)
Estimate your due date from LMP, see your current week/trimester, and view a week-by-week timeline
Estimate due date, milestones, and progress
Calculate based on
Uses Naegele’s rule (adds 280 days). Early ultrasound may refine dates.
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How it works
This calculator estimates your estimated due date (EDD) from the first day of your last menstrual period (LMP). Pregnancy dating is traditionally measured from LMP because it’s often the most reliable reference point.
After calculating the EDD, the calculator can also estimate: current gestational age (weeks + days), trimester, and a week-by-week timeline with key milestones.
Timeline fun-factor: Your week-by-week bar can optionally show “baby is about the size of…” using a Fruit or Animal view (toggle at the top of the timeline).
Dating is an estimate—confirm with your antenatal provider and follow local clinical guidelines.
Formula
Frequently asked questions
Clinical reminder: Always follow local protocols and consult medication information sheets. These examples are for calculation practice only.
References & sources
For pregnancy dating, screening windows, and safety guidance, use trusted maternity references and follow your local service policy.
Guidance on estimating due date and prenatal care.
Pregnancy and maternal health guidance and resources.
Australian consumer-friendly pregnancy timelines and milestones.
Professional guidance for obstetrics and maternity care.
Medical disclaimer: This calculator provides an estimate only and does not replace clinical assessment, ultrasound dating, or local maternity guidelines.
Related Calculators
Evidence-based safety
Dating can be revised by ultrasound and clinical context. Use this calculator for planning and education—confirm important decisions with your antenatal provider.