How To Find Out How Far Along Your Pregnancy Is
Utilize this pregnancy reckoner to calculate your due date, run into how many weeks significant yous are and estimate your probability of giving nascence on different dates.
What is my due date?
Your due date, also known every bit your estimated date of delivery, is the approximate date your labor might begin. Your estimated due date is commonly calculated by calculation 280 days (xl weeks) to the appointment of the first twenty-four hour period of your terminal menstruum, using Naegele'southward rule.1 This may vary if y'all accept irregular periods.
It'due south worth noting that although predicted due dates are commonly calculated at 280 days, a baby is born on its predicted due engagement just 5% of the time.2 A 2022 written report published in the International Journal of Obstetrics & Gynaecology suggests a number of factors that can influence the length of your pregnancy, including ethnicity, tiptop, variations in the menstrual cycle, the timing of ovulation, parity and maternal weight. It is for this reason that calculations using Naegele'south rule can be considered as an estimate and not a definitive date.three
How far along am I?
To calculate how many weeks pregnant you are, our pregnancy calculator looks at the first day of your last menstrual period (LMP) and compares information technology to today's date. The first day of your LMP counts as the showtime twenty-four hour period of your pregnancy. This adding is based upon an average cycle of 28 days. If your bicycle is different to 28 days, your calculation volition vary based upon this.
You will observe that the sonographer at your get-go ultrasound scan (often chosen the dating scan) will give y'all a more authentic idea of how many weeks meaning yous are past measuring your baby from its head to its bottom to form a determination.
If you lot want to calculate an estimated due date manually using Naegele's rule, hither's how to do it:
- Find out the outset day of your last menstrual period
- Subtract 3 months from that date
- Add 1 year and vii days
How many weeks are you lot meaning for?
Around 90% of pregnancies last between 37 and 42 weeks.ane If a baby is born before 37 weeks, he/she is considered preterm or premature.
The three trimesters
There are three trimesters in a pregnancy, with around 13 or 14 weeks per trimester:
- First trimester: Weeks 0 to 12
- 2nd trimester: Weeks thirteen to 27
- Third trimester: Weeks 28 to twoscore+
You lot can read more nearly the iii trimesters in this article about the stages of pregnancy.
When volition my baby be born?
This pregnancy reckoner uses one of two methods to work out when your baby might be built-in. If you make full in the start date of your last period, it takes that date and adds 40 weeks (assuming you've chosen a 28 day average bike). If you've chosen a different cycle, it will add or subtract days based upon that. If you choose to calculate by ultrasound appointment, the calculator volition work out your due date based upon how far along you are on that engagement. This will likely yield a more accurate outcome.
The 280 day figure is based upon Naegele's Rule and is the near common method of computing due dates. German language obstetrician Franz Naegele created his formula in 1812 and it has been referenced ever since.
How accurate is this pregnancy computer?
It is important to recall that this pregnancy calculator is meant to be a fleck of fun and the results contain guesswork (equally with all 'predictions' most the future). Assuming a natural birth, at that place'southward no way of knowing for certain when your infant will arrive. It is worth noting that only 5% of babies arrive on their due engagement.1 The vast bulk are born 2 weeks either side. This calculator, equally with all due appointment calculators, should be used only as a guide, to give yous a piddling help with planning for your baby's inflow.
At the point of 42 weeks, births are usually considered 'post-term'. If you reach this point, your hospital will probable induce labour for the condom of the baby. You can learn more about this and about due dates in this article by the Essential Parent website .
How do your due date charts work?
The due appointment charts show possible due dates based upon data from a nascence survey carried out past Spacefem.com.iv The survey relied upon right information being input by each of the nine,000+ Mums who took office; it was not a peer reviewed scientific report. It's of import to retrieve that your nascence date probability will vary based upon many factors, including your age, health, ethnic origin and whether you lot've given nascence before.
Estimator created by Alastair Hazell and reviewed past Aaron Kandola. Estimator references
Source: https://www.thecalculatorsite.com/health/pregnancy-calculator.php
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