Have you recently found out that you’re pregnant? Congratulations! Our due date calculator for pregnancy will help to give you an idea of when you might expect your baby to arrive.

You’re about to embark on an amazing journey. And one of the first things you’ll want to know is when your baby might be due.

We can help you find that out with our surprisingly accurate Due Date Calculator for Pregnancy.

Conception to Due Date Calculation

Your due date is often referred to as your ‘estimated date of delivery (EDD)‘, every pregnancy is different and this is just an estimate.

The exact date of conception is likely to remain a best-guess scenario. Although if you’ve been trying to get pregnant, or you’ve only had sex recently since testing positive, then you’ll probably be able to pinpoint the date of conception. 

Either way, we call this the ‘probable date you conceived’, and it should be quite close to the actual date. 

Weeks by Due Date Calculation

Once we’ve estimated your likely conception date, we can work out what your baby’s estimated age is, as of today.

We think this is one of the coolest dates because it tells you the estimated date of your foetus. And in a way, this is the actual age of your baby. It’s the number of weeks and days since your baby’s ‘birth date’, or the day you conceived!

Baby’s Birthstone and Birthflower

Best Free Due Date Calculator for Pregnancy-birthstones

We recently rolled out an update to the pregnancy due date calculator. 

We used the information we’ve collated on birthstones and birthflowers and added this to the pregnancy tool. Of course, this will depend exactly what month your baby does finally arrive into the world. And babies do tend to arrive when we’re least expecting it. But it’s fun to start thinking about. 

How do I Calculate When is my Baby Due?

It’s really impossible to say exactly when your baby might be born.

But a pregnancy due date calculator will help to give you a pretty good idea, certainly within a few weeks, so that you can start to prepare for the big day!

Of course, even with a very accurate due date, baby may arrive earlier or later than the date. But knowing roughly when your baby is due means you can start planning your parental leave, baby scans and begin thinking about pre and post-natal health and nutrition, etc.

Let’s give it a go now…

To use this due date calculator, you need to enter the day that your last period started. Don’t worry too much if you can’t remember exactly – just put the most likely date.

Kiwi Families Due Date Calculator for Pregnancy

Just enter the date of the first day of your last menstrual period (LMP) enter the pregnancy due date calculator below:

kiwi family



Enter the date of the first day of your last menstrual period (LMP):



Probable date you conceived:


Baby age as of today:


First heartbeats heard with a Doppler:


(11 to 12 weeks)

Best date range for NT scan:


(12 weeks 3 days to 13 weeks 3 days)

Best date range for routine ultrasound:


(18 to 20 weeks)

Your baby's birthstone is:


Your baby's birthflower is:



Sign up now for our 52 weeks of pregnancy

Now that you know your approximate due date, sign up for our 52 weeks of pregnancy. Developed with New Zealand midwives 52 weeks of pregnancy is a weekly email packed full of advice for you and your baby, including choosing a carer, relationship advice, health and nutrition, and the different stages of baby growth.

Coming Soon…

In the meantime, find out everything you need to know about the Three trimesters of pregnancy

5 2 votes
Article Rating

This information was compiled by the Kiwi Families team.

Notify of

oldest most voted
Inline Feedbacks
View all comments

hi went of the pill in june haven’t got my period got nausea all the time and have little butterflies going over my tummy and sore boobs could I be pregnant

Jarrod Rendle

Hey Lisa, thanks for your comment. It’s certainly possible! Hi Tabie. I’d suggest you try out our free online pregnancy test http://www.kiwifamilies.co.nz/articles/free-online-pregnancy-test/ to get a better indication of your symptoms, and then take a pregnancy test if your period still hasn’t come. — Jarrod


Hi there. I’m currently 15 weeks pregnant. My last period was 28th November 2020 to the 3rd December, before my period me an my current partner we weren’t together for 4 months after a 4year relationship then we got back together on the 25 November (we didn’t have sex till around the 25th November)Ive slept with someone else on the 21st November an had sexual intercourse with him. My periods are irregular but I’ve been tracking them … to put my mind at ease will this baby be my partners or that someone else’s baby ? This will be my… Read more »

Jarrod Rendle

Thanks for your comment. That close together, it would just be impossible to tell. I think you’ve got the right idea regarding the dna test. That way you’ll know for sure, and can make decisions around that. Best of luck with your pregnancy! — Jarrod


Also she has tried about 5 different due date calculates some say she’s 5weeks some say shes 6weeks 3days also her flo says she’s 2weeks 5days

Jarrod Rendle

The due date calculators can only ever give an indication or approximation of delivery date. Every pregnancy is different! Best of luck to your friend. — Jarrod


Asking for a friend her last period was June 23rd 2020 done 4 negative test 4 faint line test and started spotting for 2 days should she take another test just to confirm ??

Jarrod Rendle

Usually a faint line, any line at all, on a pregnancy test is a positive result. But spotting while pregnant can sometimes happen. I’d suggest seeing a doctor/physician to confirm though. — Jarrod

Audra Bourn

Hi, my name is Audra.
My boyfriend and I last had intercourse in November (unsure of exact day) I had a cycle in December but it was light and only lasted three days. It is now January and I am three days late and I believe I’m experiencing early pregnancy symptoms. I was wondering if I could be pregnant even though we had intercourse about a month in a half to two months ago. I’m new to this so any help would be great.


Hi Audra, you can’t get your period and be pregnant at the same time, so it seems unlikely. Some women do, however, get light spotting during pregnancy, which some mistake as their period. I’d suggest you try out our free online pregnancy test http://www.kiwifamilies.co.nz/ articles/free-online-pregnancy-test/, and perhaps order a pregnancy test kit if you’re still concerned in a few days. — Jarrod

Tabie Wilbourn-Little

So I am 43 had tubes 9 1/2 years ago have all the pregnancy symptoms took test neg, haven’t had or seen my period sence Sept 16,2017. I have flutters or butterflies very bloated and tummy tender any suggestions.


Hi Tabie. It would be difficult for us to tell, as everyone’s body is different. I’d suggest you try out our free online pregnancy test http://www.kiwifamilies.co.nz/articles/free-online-pregnancy-test/, and perhaps see your doctor if you’re still concerned. — Jarrod

Rayleen Horsey

Hi I have 5 children I have never been late before with my period I am 10 days late I have done several home test all negative but I never got a positive one with my other children till i was 3 months I have all the symptoms of pregnancy but I started to spot bright red only when I wiped I noticed it I never had it with my other children
Could I be pregnant

Mis Wright

I have the symptoms but no positive test and 1 weeks 3 days late on period am i pregnant help


Hi there, you can certainly have many of the symptoms without being pregnant. If you wait 1 week after your last period was due, and take the test first thing in the morning when your urine is more concentrated, most tests are said to be 99% accurate. So you should get an accurate result. You can always wait another week and test again if you think the result was inconclusive though. — Jarrod


Hi I have a big concern OK…the last time I saw my period was 25 of August 2015…. I had unprotected sex on the 9 of September and I had to take a morning after pill later down in the month I did really had any appetite and my period was late on October 4 and 12 I had light spotting that last for couple hours nothing much that I would see but when I go to the bathroom and pee then wipe I would see the blood….. my period is now 23 days late I had cramp, different craving,tender… Read more »


18 days before me & my hubby had unprotected sss. Now I missed my period 13 days. I chedked 3 urine Test & 2 Blood Test.. all rea negative. We are eagarly waiting to gey baby. so when can i take the other Test. So , kindly please help me


I know I had sex on the 25th of April, n I last got my period around 10th of April.. How do I tell how far I am when should I go for a pregnancy ultrasound?


I’ve got all symptoms of pregnancy took a clear blue test came back positive.. It just doesn’t feel real & i need abit of advice pls n thank u x


Hi my name is Charlotte last month I have my light period this month nothing… I do feel cramps, pee a lot and feeling tired. We dd use a condom but it break so does that mean I could be pregnant

Cherrii Lovee

Hi my name is Erika.. I am against abortions but it was needed in March 10.2015 RIP my baby 🙁 then my last period was 4/12/15 had sex with my husband within the 5days after that period.. I waited till 5/17/15 and took a pregnancy test came positive with faded line and then 5/20/15 I took another one and it the same positive wit a faint line. On 5/21/15 I started bleeding and I don’t know what is going on.. Now it is 5/25/15 do u think i can b pregnant??

Rochelle Gribble

Hi Erika, Sounds like you’ve been having a tough time. Anything is possible so if you are concerned, the best thing to do is visit your GP. Good luck!

akila suresh

my last period was march 3. my period was delayed one day. the 2nd day(last saturday) i have some bleeding like watery pink and brown color. in intervals of time i have heavy and light bleeding. my doctor said to take pregnancy test wait upto 9th april they did not take pregnancy.my bleeding was stopped in monday aftnun . i have all pregnancy symptoms now i am preganant or not?


hi! in February i got my periods on the 8th and they were normal. on the 23th of feb i had unprotected sex den i took morning after pills the next day the 24th. then on Saturday march 8th while having protected sex i started my periods then when i woke up in the morning, my pad was empty and today is the 3rd day nothing is happening, except for the pains in bladder like i`m going to get my periods and my breasts are itching. could i be pregnant?


i have had a tubelagation 9 yrs ago but now im late and having all the symtoms of a pregnancy and no one to talk to what do i do

Rochelle Gribble

Hi Angela,

Tubal Ligation does have a small risk of failure – see our information here:http://www.kiwifamilies.co.nz/articles/tubal-ligation-female-sterilisation/ so if you do think you are pregnant, the best thing to do is talk to your GP or local Family Planning clinic.

Good luck,



hi i m chaithanya my last period was on 11 of nov but still nw i did nt get my periods for this month, and i tested in pragence tester also its showing negative, i dono wat to do, plz solve me

Melanie Wiki

Hi, maybe visit your doctor and ask for a blood test, the results are more accurate. goodluck 🙂


13 february!!! 

Rochelle Gribble



thank you.we are very excited… little one was unexpected but it almost makes it a little more special

Rochelle Gribble

🙂 That’s great! 


 Estimated Due Date: 3 Nov 2012 !!!!!!

Rochelle Gribble

Yah!! Congratulations!!!



Would love your thoughts, please comment.x