Due date calculator

Use our due date calculator to see when your baby is going to join you

It’s our recommendation that the best time to do your She Births® course is between 22 – 32 weeks gestation. If you are before 22 weeks, do sign up for our Free Pregnancy Support Guide so that we can support you to feel calm, connected and inspired throughout the first half of your pregnancy journey. 

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    Assuming a 28 menstrual cycle duration

Your due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (assuming a 28 day cycle). Note that your menstrual period and ovulation are counted as the first two weeks of pregnancy. If you deliver on your due date, your baby is actually only 38 weeks old, not 40.

This is an estimated due date only. This calculator is only an estimate of when your baby is due, and is not to be relied upon for your actual due date.

The start of your pregnancy is actually calculated from the start date of your last menstrual period (LMP), or day 1 of your cycle. Given this method of calculation, your pregnancy is measured in what is termed gestational weeks, as opposed to being measured from the actual day of conception. Counting from the first day of your LMP, there are 40 gestational weeks of pregnancy. Assuming that you have a 28-day cycle, in gestational weeks 1 and 2, your baby is waiting to be conceived. On day 14, and at the start of gestational week 3, your baby has just been created. By the end of gestational week 3, the actual age of your baby is one week.

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