Pregnancy due date calculator
Congratulations! One of the first questions after a positive test is “when is the baby due?”. Thispregnancy due date calculator estimates your EDD (estimated date of delivery) the same way doctors do, and shows how far along you are, which trimester you're in and when the important scans and tests usually happen. You can calculate from the first day of your last period, a known conception date or an IVF embryo transfer date.
How to use it
- Choose what you know: last period, conception date or IVF transfer date.
- Pick the date. For the last-period method, set your usual cycle length (28 days is typical).
- Read your due date, current week and the timeline of upcoming checkups.
How the due date is worked out
Due date = first day of last period + 280 days + (cycle length − 28)
From conception: + 266 days. IVF: transfer date + 263 days (day-3 embryo) or + 261 days (day-5 embryo).
Example
If your last period started on 1 January 2026 and your cycle is 28 days, your due date is 1 January + 280 days = 8 October 2026. With a 30-day cycle, ovulation probably happened two days later, so the due date moves to 10 October 2026. On 6 October 2026 you would be 39 weeks and 5 days pregnant.
Typical checkups during pregnancy (India)
- Weeks 6–9: first ultrasound to confirm and date the pregnancy.
- Weeks 11–13: NT scan and first-trimester screening (double marker).
- Weeks 18–20: anomaly (level-II) scan.
- Weeks 24–28: glucose test for gestational diabetes.
- From week 28: more frequent visits; growth scans as advised.
Your doctor's schedule may differ. Keep track of your health with our BMI calculator.
Health disclaimer: This tool gives general estimates for information only and is not medical advice, diagnosis or treatment. Please consult a qualified doctor about your health. Read the full disclaimer.