Question 1

How do I calculate my due date from conception?

Accepted Answer

To calculate your due date from conception, add 266 days (38 weeks) to your conception date. Our calculator does this automatically — simply select 'Conception Date' as your calculation method and enter the date. This is the most accurate method if you know your exact conception date.

Question 2

How does the due date calculator by IVF work?

Accepted Answer

For IVF pregnancies, the due date is calculated based on the embryo transfer date. For a Day 3 embryo transfer, we add 263 days. For a Day 5 blastocyst or FET transfer, we add 261 days. Simply select the appropriate IVF method in our calculator for accurate results.

Question 3

What is a FET due date calculator?

Accepted Answer

A FET (Frozen Embryo Transfer) due date calculator estimates your due date based on when the frozen embryo was transferred. Since the embryo is typically a Day 5 blastocyst, you add 261 days to the transfer date. Select 'FET / IVF Transfer Date (Day 5 Blastocyst)' in our calculator.

Question 4

How does the dog due date calculator work?

Accepted Answer

Dog pregnancy (gestation) typically lasts about 63 days (approximately 9 weeks) from the mating date. Select 'Dog / Canine Mating Date' as the calculation method, enter the mating date, and our calculator will estimate when the puppies will arrive, along with the current stage of pregnancy.

Question 5

How accurate is the baby due date calculator?

Accepted Answer

Due date calculations are estimates — only about 5% of babies are born on their exact due date. Most babies arrive within 2 weeks before or after the estimated date. The conception date method is generally more accurate than the LMP method. Always confirm with your healthcare provider.

Question 6

What is the difference between LMP and conception date methods?

Accepted Answer

The LMP (Last Menstrual Period) method adds 280 days to the first day of your last period. The Conception Date method adds 266 days to the actual conception date. The conception method is more accurate but requires knowing your exact conception date.

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