How does a due date calculator work?
A due date calculator estimates when your baby may be born by adding 40 weeks (280 days) to the first day of your last menstrual period. Some calculators also adjust the estimate slightly based on cycle length.
How accurate is a pregnancy due date?
A due date is an estimate, not an exact date. Many babies are born before or after their due date, and this is completely normal. Your midwife or GP may adjust the date after scans.
Can my due date change?
Yes. Your due date may change after an ultrasound scan, especially if your cycle is irregular or if early measurements suggest a different gestational age.
What if my periods are irregular?
If your periods are irregular, a due date calculator can still give an estimate, but it may be less precise. In these cases, medical scans are especially helpful in confirming pregnancy dates.
How many weeks pregnant am I?
The calculator shows how many weeks and days pregnant you are today by counting from the first day of your last period up to the current date.
What does “full term” mean in pregnancy?
A pregnancy is considered full term at 37 weeks. Babies born from this point onwards are usually fully developed, although many are born closer to 40 weeks.
Should I see a doctor to confirm my due date?
Yes. A due date calculator is a helpful guide, but you should always visit your GP or midwife to confirm your due date and receive appropriate prenatal care.
What should I do after finding my due date?
After estimating your due date, you can begin planning appointments, preparing your home, and choosing baby essentials suited to your baby’s expected age and season.
How Accurate Is a Due Date Calculator?
A due date calculator provides an estimate, not an exact prediction. Only around 1 in 20 babies are born on their estimated due date. Many arrive a little earlier or later, which is completely normal.
Your GP or midwife may adjust your due date later in pregnancy, especially after ultrasound scans, which help confirm how far along the pregnancy is.
Why Due Dates Are Calculated From Your Last Period?
Although conception usually happens about two weeks after your last period, it’s often difficult to pinpoint the exact day of ovulation. That’s why pregnancy dating typically starts from the first day of your last menstrual period, even though conception happens later.
This method is used by healthcare professionals across the UK and internationally, making it the most reliable starting point for estimating pregnancy milestones.
What Happens After You Know Your Due Date?
Once you have an estimated due date, you can:
- Plan ahead for pregnancy appointments and scans
- Track weekly pregnancy milestones
- Start preparing for your baby’s arrival
- Choose clothing and essentials based on your baby’s expected age and season
Aneby supports parents at every stage, from early pregnancy planning to choosing soft, organic cotton clothing for your baby’s first months.
Gentle Reminder
This due date calculator is for informational purposes only. Every pregnancy is different, and dates are confirmed by medical professionals.
Always speak to your GP, midwife, or healthcare provider to confirm your due date and receive personalised prenatal care.
Due Date Calculator Frequently Asked Questions:
How does a due date calculator work?
A due date calculator estimates when your baby may be born by adding 40 weeks (280 days) to the first day of your last menstrual period. Some calculators also adjust the estimate slightly based on cycle length.
How accurate is a pregnancy due date?
A due date is an estimate, not an exact date. Many babies are born before or after their due date, and this is completely normal. Your midwife or GP may adjust the date after scans.
Can my due date change?
Yes. Your due date may change after an ultrasound scan, especially if your cycle is irregular or if early measurements suggest a different gestational age.
What if my periods are irregular?
If your periods are irregular, a due date calculator can still give an estimate, but it may be less precise. In these cases, medical scans are especially helpful in confirming pregnancy dates.
How many weeks pregnant am I?
The calculator shows how many weeks and days pregnant you are today by counting from the first day of your last period up to the current date.
What does “full term” mean in pregnancy?
A pregnancy is considered full term at 37 weeks. Babies born from this point onwards are usually fully developed, although many are born closer to 40 weeks.
Should I see a doctor to confirm my due date?
Yes. A due date calculator is a helpful guide, but you should always visit your GP or midwife to confirm your due date and receive appropriate prenatal care.
What should I do after finding my due date?
After estimating your due date, you can begin planning appointments, preparing your home, and choosing baby essentials suited to your baby’s expected age and season.
