You might not be aware that both your menstrual and ovulation periods count as the first two weeks of your pregnancy. So it's understandable that things can get confusing – especially if your regular cycle is longer or shorter than the average of 28 days.
While it’s true that most pregnancies last 40 weeks, there are other factors at play which will determine your due date. Using both the date of your last period, and the length of your regular cycle, our calculator will quickly work out your estimated due date, tailoring it accordingly for longer, shorter, and average cycle lengths.
If you’re certain of the date of conception, you can use this date as an alternative. Our calculator makes allowances for the first two weeks of both your period and ovulation too.
Use these three simple steps to calculate your due date:
1. First, you’ll want to work out the first day of your last period, and also determine your average cycle length. This is the amount of time between the first day of one period to the day before you start another. If you’re sure of the exact day you conceived, you can select this option as an alternative.
2. Enter the relevant dates into the due date calculator.
3. Then hit Find out now!
Keep in mind that the result will be an estimation rather than a fixed date. All pregnancies are different, after all.