Pregnancy Due Date Calculator
Calculate an estimated due date based on the last menstrual period and view gestational age and trimester.
Estimated due date
Select your last menstrual period date to calculate.
How it works
- Adds 280 days to the LMP date to estimate due date.
- Calculates gestational age in weeks and days.
- Assigns the current trimester based on gestational age.
Recommended next steps
Pregnancy timelines vary between individuals. Use this estimate as a guide and follow up with a healthcare professional for personalised care.
Early pregnancy
- Book an initial antenatal visit if not already done.
- Discuss supplements such as folic acid with your doctor.
- Seek medical advice if you have pain or bleeding.
Ongoing antenatal care
- Attend scheduled antenatal check-ups and scans.
- Monitor symptoms and fetal movements as advised.
- Discuss any concerns with your healthcare provider.
Frequently asked questions
The due date is estimated by adding 280 days (40 weeks) to the first day of the last menstrual period.
Gestational age refers to the number of weeks and days since the first day of the last menstrual period.
No. Ultrasound and clinical assessment provide the most accurate pregnancy dating.
First trimester is weeks 0–13, second trimester is weeks 14–27, and third trimester is week 28 onwards.
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