Pregnancy Due Date Ranges

This table attempts to estimate your probability of going into labor on different individual days based on your estimated due date. If you don't know your due date, or just want a handy daily page to tell you where you're at, use the pregnancy calendar.

It's based on the idea that the average pregnancy lasts 40 weeks with a standard deviation of about 10 days. This means you're more likely to go into labor on one of the days close to your due date. For instance, about half of all babies are born within a week of their date. Scroll to the bottom of this page if you want to know more about where I got these numbers.

The following dates are based on an estimated due date of November 10th, 2016.

Change due date:
Month Day Year
Date Progress Overall probability of
spontaneous labor
Current probability of
spontaneous labor
probability of a pregnant woman at this stage going into labor
On this date By this date On this date By this date On this date Within 3 days Within 5 days Within 7 days
Thursday October 6th, 2016 35W, 0D 0.01% 0.02% -% -% -% 0.1% 0.1% 0.2%
Friday October 7th, 2016 35W, 1D 0.01% 0.03% -% -% -% 0.1% 0.2% 0.3%
Saturday October 8th, 2016 35W, 2D 0.02% 0.05% -% -% -% 0.1% 0.2% 0.4%
Sunday October 9th, 2016 35W, 3D 0.02% 0.07% -% -% -% 0.1% 0.3% 0.6%
Monday October 10th, 2016 35W, 4D 0.03% 0.1% -% -% -% 0.2% 0.4% 0.7%
Tuesday October 11th, 2016 35W, 5D 0.04% 0.13% -% -% -% 0.2% 0.5% 0.9%
Wednesday October 12th, 2016 35W, 6D 0.06% 0.19% -% -% 0.1% 0.3% 0.6% 1.2%
Thursday October 13th, 2016 36W, 0D 0.08% 0.26% -% -% 0.1% 0.4% 0.8% 1.5%
Friday October 14th, 2016 36W, 1D 0.1% 0.35% -% -% 0.1% 0.5% 1% 1.9%
Saturday October 15th, 2016 36W, 2D 0.14% 0.47% -% -% 0.1% 0.6% 1.3% 2.4%
Sunday October 16th, 2016 36W, 3D 0.18% 0.62% -% -% 0.2% 0.8% 1.7% 3%
Monday October 17th, 2016 36W, 4D 0.22% 0.82% -% -% 0.2% 1% 2.1% 3.7%
Tuesday October 18th, 2016 36W, 5D 0.28% 1.07% -% -% 0.3% 1.2% 2.5% 4.5%
Wednesday October 19th, 2016 36W, 6D 0.35% 1.39% -% -% 0.4% 1.5% 3.1% 5.4%
Thursday October 20th, 2016 37W, 0D 0.44% 1.79% -% -% 0.4% 1.8% 3.8% 6.4%
Friday October 21st, 2016 37W, 1D 0.54% 2.28% -% -% 0.6% 2.2% 4.5% 7.6%
Saturday October 22nd, 2016 37W, 2D 0.66% 2.87% -% -% 0.7% 2.7% 5.4% 8.9%
Sunday October 23rd, 2016 37W, 3D 0.79% 3.59% -% -% 0.8% 3.2% 6.3% 10.4%
Monday October 24th, 2016 37W, 4D 0.94% 4.46% -% -% 1% 3.8% 7.4% 11.9%
Tuesday October 25th, 2016 37W, 5D 1.11% 5.48% -% -% 1.2% 4.4% 8.6% 13.7%
Wednesday October 26th, 2016 37W, 6D 1.3% 6.68% -% -% 1.4% 5.2% 9.8% 15.5%
Thursday October 27th, 2016 38W, 0D 1.5% 8.08% -% -% 1.6% 6% 11.2% 17.5%
Friday October 28th, 2016 38W, 1D 1.71% 9.68% -% -% 1.9% 6.9% 12.7% 19.7%
Saturday October 29th, 2016 38W, 2D 1.94% 11.51% -% -% 2.2% 7.8% 14.3% 21.9%
Sunday October 30th, 2016 38W, 3D 2.18% 13.57% -% -% 2.5% 8.8% 16% 24.2%
Monday October 31st, 2016 38W, 4D 2.42% 15.87% -% -% 2.9% 9.9% 17.8% 26.6%
Tuesday November 1st, 2016 38W, 5D 2.66% 18.41% -% -% 3.3% 11.1% 19.7% 29%
Wednesday November 2nd, 2016 38W, 6D 2.9% 21.19% -% -% 3.7% 12.3% 21.6% 31.5%
Thursday November 3rd, 2016 39W, 0D 3.12% 24.2% -% -% 4.1% 13.5% 23.6% 34%
Friday November 4th, 2016 39W, 1D 3.33% 27.43% -% -% 4.6% 14.9% 25.6% 36.6%
Saturday November 5th, 2016 39W, 2D 3.52% 30.85% -% -% 5.1% 16.2% 27.7% 39.2%
Sunday November 6th, 2016 39W, 3D 3.68% 34.46% -% -% 5.6% 17.6% 29.8% 41.7%
Monday November 7th, 2016 39W, 4D 3.81% 38.21% -% -% 6.2% 19.1% 31.9% 44.2%
Tuesday November 8th, 2016 39W, 5D 3.91% 42.07% -% -% 6.7% 20.6% 34% 46.7%
Wednesday November 9th, 2016 39W, 6D 3.97% 46.02% -% -% 7.4% 22.1% 36.2% 49.2%
Thursday November 10th, 2016 40W, 0D 3.99% 50% -% -% 8% 23.6% 38.3% 51.6%
Friday November 11th, 2016 40W, 1D 3.97% 53.98% -% -% 8.6% 25.1% 40.4% 54%
Saturday November 12th, 2016 40W, 2D 3.91% 57.93% -% -% 9.3% 26.7% 42.5% 56.2%
Sunday November 13th, 2016 40W, 3D 3.81% 61.79% -% -% 10% 28.2% 44.5% 58.5%
Monday November 14th, 2016 40W, 4D 3.68% 65.54% -% -% 10.7% 29.8% 46.6% 60.6%
Tuesday November 15th, 2016 40W, 5D 3.52% 69.15% -% -% 11.4% 31.3% 48.6% 62.7%
Wednesday November 16th, 2016 40W, 6D 3.33% 72.57% -% -% 12.1% 32.9% 50.5% 64.7%
Thursday November 17th, 2016 41W, 0D 3.12% 75.8% -% -% 12.9% 34.4% 52.4% 66.6%
Friday November 18th, 2016 41W, 1D 2.9% 78.81% -% -% 13.7% 36% 54.3% 68.5%
Saturday November 19th, 2016 41W, 2D 2.66% 81.59% -% -% 14.4% 37.5% 56.1% 70.2%
Sunday November 20th, 2016 41W, 3D 2.42% 84.13% -% -% 15.2% 39% 57.9% 71.9%
Monday November 21st, 2016 41W, 4D 2.18% 86.43% -% -% 16.1% 40.5% 59.6% 73.5%
Tuesday November 22nd, 2016 41W, 5D 1.94% 88.49% -% -% 16.9% 42% 61.3% 75.1%
Wednesday November 23rd, 2016 41W, 6D 1.71% 90.32% -% -% 17.7% 43.4% 62.9% 76.4%
Thursday November 24th, 2016 42W, 0D 1.5% 91.92% -% -% 18.6% 44.8% 64.5% 77.8%
Friday November 25th, 2016 42W, 1D 1.3% 93.32% -% -% 19.5% 46.3% 65.9% 79.2%
Saturday November 26th, 2016 42W, 2D 1.11% 94.52% -% -% 20.3% 47.6% 67.3% 80.5%
Sunday November 27th, 2016 42W, 3D 0.94% 95.54% -% -% 21.1% 48.9% 68.8% 81.6%
Monday November 28th, 2016 42W, 4D 0.79% 96.41% -% -% 22% 50.1% 70.2% 82.7%
Tuesday November 29th, 2016 42W, 5D 0.66% 97.13% -% -% 23% 51.6% 71.4% 83.6%
Wednesday November 30th, 2016 42W, 6D 0.54% 97.72% -% -% 23.7% 53.1% 72.8% 84.6%
Thursday December 1st, 2016 43W, 0D 0.44% 98.21% -% -% 24.6% 54.2% 73.7% 85.5%
Friday December 2nd, 2016 43W, 1D 0.35% 98.61% -% -% 25.2% 55.4% 74.8% 86.3%
Saturday December 3rd, 2016 43W, 2D 0.28% 98.93% -% -% 26.2% 56.1% 75.7% 87.9%
Sunday December 4th, 2016 43W, 3D 0.22% 99.18% -% -% 26.8% 57.3% 76.8% -%
Monday December 5th, 2016 43W, 4D 0.18% 99.38% -% -% 29% 58.1% 79% -%
Tuesday December 6th, 2016 43W, 5D 0.14% 99.53% -% -% 29.8% 59.6% -% -%
Wednesday December 7th, 2016 43W, 6D 0.1% 99.65% -% -% 28.6% 62.9% -% -%
Thursday December 8th, 2016 44W, 0D 0.08% 99.74% -% -% 30.8% -% -% -%
Friday December 9th, 2016 44W, 1D 0.06% 99.81% -% -% 31.6% -% -% -%
Saturday December 10th, 2016 44W, 2D 0.04% 99.87% -% -% 30.8% -% -% -%

Probability of labor on a given day

Probability of labor by a given day

Notes and disclaimers

All percentages are estimates based on mathematical averages and should not be taken terribly seriously... just because you only have 5% chance of going into labor two weeks early, that doesn't mean you should schedule a trip to the bahamas that weekend (see xkcd to get what I mean here).

You should (obviously) listen to your doctor or midwife on all matters related to pregnancy and childbirth. Just because this chart tells you that a 42W pregnant woman has a high chance of delivering in the next seven days, it doesn't mean it's healthy for her to be pregnant for seven more days. If your doctor wants to increase probability of delivery by inducing labor, there's probably a good reason.

Finding good distribution statistics on spontaneous labor is interesting. I have not found a study with an exact daily breakdown of when babies are born. However I have read way too much on this topic, so I can tell you that my favorite published research is The length of human pregnancy as calculated by ultrasonographic measurement of the fetal biparietal diameter (H. Kieler, O. Axelsson, S. Nilsson, U. Waldenströ) which a very nice table of 10 published studies, which found various means between 272-283 days. The study contributes their own results as well, analyzing nearly 2000 mothers who went into labor spontaneously, and there's graphs of what they found. They found a mean around 280 days, and standard deviations between 8-11 days. There's a big list of other studies and answers in the Introduction to my due date survey results.

Which leads to this topic... I am also in the process of collecting my own statistics. If you have had a baby, please take my due date survey. Oddly enough, the numbers I've collected so far support my messy hunch that pregnancy length has a 40-week mean and 9-10 day standard deviation. So go me.

Anyway if you have better research, drop me an e-mail (spacefem@spacefem.com).

Charts are generated by flot.

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Recent Comments

For more support, encouragement, Q&A, you are invited to join our pregnancy forum. We are dedicated to answering complicated questions as logically as we possibly can.

To all Moms: Where do you go for financial concerns?

Tue May 9 4:18 PM by rowan in Pregnancy & Parenting

My father in law does financial advising so we kind of have an in-house advisor? But seriously someone with expertise is great. There are various "how to do finances" through our local community ed, which I'd probably consider if I didn't already have someone to ask. Maybe something like that near you? Libraries also sometimes have programs.

Also I know you can do wills and stuff on your own but honestly I found it super useful to talk through it with a lawyer who does that. She thought of things we never would have. (hm really should revisit now that kid is older) It was a one time fee and not that bad.

We do most of our banking through a credit union. Have been happy with them. We refinanced our mortgage through them when we did that. I remember the big credit union bust ages ago, but there are lots more protections in place now and big banks can be pretty awful.


stuffed animals

Thu Feb 23 1:20 AM by antfancier in Pregnancy & Parenting

My brother's favorite stuffed animal was a thing we called 'gerbil'. I actually don't know what it was because we found it in the street (not sure what my mum was thinking in allowing him to pick it up, let alone keep it) and it had already lost an eye and was unidentifiable, but he became really attached to it. We almost missed a flight once because he dropped it in the airport and we had to go back to look for it.

Today for the first time my 11month old showed interest in a stuffed animal. Just before Christmas we received a box from Amazon with a giant bear inside. No gift wrap, no note. Just a bear the size of my child. It's been sat in his room and ignored completely, despite him exploring literally everything else that is in there. Then, out of the blue, he made a beeline for it and tried to pull its eyes out.


tactile stuff

Wed Jan 4 6:14 AM by Neko in Pregnancy & Parenting

All the pliable/crafty stuff I can think of has been mentioned. ETA: I lied. Bread dough!

But if generally tactile surfaces also apply, mermaid sequin pillows are comforting. It was one of my impulse buys at a department store about a month ago. I couldn't stop petting the display. The sequined side seemed like it wouldn't be comfortable to rest on but it hasn't been an issue. My stepdad really likes them so I got him one for giftmas and he said it helps distract him when chronic pain keeps him awake at night. https://www.etsy.com/listing/470423508/ ... _active_40

I haven't field tested them on my nieces and nephews yet. That could be fun.


protective restrictions for children

Tue Dec 6 10:08 PM by melsbells in Pregnancy & Parenting

The Wolfpack, a documentary about six bright teenage brothers have spent their entire lives locked away from society in a manhattan housing project. all they know of the outside is gleaned from the movies they watch obsessively (and recreate meticulously). yet as adolescence looms, they dream of escape, ever more urgently, into the beckoning world. The film is coming from the bias that the parents have wronged their children. We're told that in the past they have left the apartment, only as a group, and up to eight times a year. One year they didn't get out at all. It's unclear what the objective of these outings were. The film leaves a lot unanswered. We know they are homeschooled by their mother, who's a certified teacher, but what the homeschooling looked like is never examined. I can't help but think that these kids all around really healthy, charming, affectionate, considerate, welcoming, really only positive adjectives come to mind.


Sleep Training for Parents and Infants

Sat Oct 1 9:34 PM by antfancier in Pregnancy & Parenting

Thank you! I'm currently stuck under 20lbs of sleeping baby because all day time naps have to be in my arms or they don't happen.


Bilingual Toddler

Wed May 3 10:19 PM by Nachos in Pregnancy & Parenting

Bilingualism! This is something I know a lot about! My last job was to speak English to my class in a partial immersion school and the kids picked up English so fast but spoke back to me in German. We worked on saying different words in German and in English and it meaning the same thing and I read English books to them. They differentiated pretty well but most of them came from a mono-lingual family background.

I can still highly recommend this book: (https://www.amazon.com/Third-Culture-Ki ... 1857885252) for bilingual children. Some very good advice in there.

Also, keep speaking English! Toddlers forget fast when a language is no longer present.

Yay bilingualism!


New parent help/suggestions

Sat Jan 14 10:07 PM by antfancier in Pregnancy & Parenting

I agree with everything lyra211 said and will add a few more.

Things you don't need:
Anything soft, fluffy or furry. My baby couldn't care less about minky blankets and soft toys. Plus they seem more gross to clean when they get covered in bodily fluids.
Clothes that look like adult clothes. It's so difficult to squeeze baby thighs into miniature corduroys or denim jeans which have no give to the fabric.
Baby washcloths. Babies make a disproportionate amount of mess so you need adult size washcloths to clean them up.

Things that were super useful:
A folding changing mat. I have a SkipHop one which has enough storage for wipes and diapers, which was all I needed to carry with me when I had a newborn. Now that he's bigger, I appreciate the larger size of the mat because the one that came with my diaper bag is way too small.
Balls. They were the first thing he played with and still his favourite toys. At the beginning he liked one made by Oball which was easy to pick up, and a soft fabric one which made a crinkly noise. Now he loves throwing a soft rubber ball and watching it bounce.


development balalnce

Fri Dec 16 5:02 PM by rinn in Pregnancy & Parenting

I was proficient in fine/gross motor skills and cognitive development for my age, but I was further behind in speech/language development and social/emotional development. I caught up in them perhaps by ages 5-7, with vestiges of social issues lasting longer (like my temper). There was nothing inherently bad about being a bit off in timing, though in my case my imbalance was severe enough that I did need professional help from a speech pathologist.

....New social situations make me feel somewhat awkward, but I've also learned that many other people feel the same way about novel contexts, so I think I'm with the curve there.

geez, are you my twin, sonic? XD

I grew up with definite lag in speech/language development. I had a speech pathologist in elementary school work on my -L-'s, -r-'s and -th-'s; and when I essentially "graduated" from it I was taken out of the IEP program. my mom and I now see that being a mistake. middle school went decently, but I struggled in language arts; and by the time I went into high school I was struggling in my history/English humanities course and Algebra. I struggled in English classes because of my inability to express myself through language clearly, and I struggled in algebra because I couldn't follow a thing my teacher was saying (we had someone tutor me who literally asked why she was tutoring me because I grasped the concepts five minutes after her explaining it).


Parents Warned they Could Lose Custody of Fourteen-Year-Old Over This

Mon Nov 7 3:33 AM by garbage videos in Pregnancy & Parenting

It is wrong to lock horses in cages and breed them as if they are slaves.
I sincerely hope that you aren't condoning slavery with that implication that it isn't wrong to keep humans in cages and force them to "breed". It's probably just an unfortunate word choice.
I said it is wrong to put horses in cages and breed them as slaves. So I don't know how you read things. Frankly you are irritating me because I shouldn't have to explain how I said 2+2=4 when you are accusing me of saying 2+2=5. In this age people should have mastered how to read clearly and I shouldn't have to micromanage my text and clear what I have already layed out clearly for you.

To be fair, if the girl is a Female to Male transsexual, her hormones are not so important, at an old age Male hormones will mutate her body and have the same effect. But with boy's its more tragic and serious. Boys who want to be girls, must stop their toxic T at an early age, or else their face will be permanently ugly and bony


bringing children up naturist

Sat Sep 24 1:18 AM by filmmakingally in Pregnancy & Parenting

It's about teaching children to make love so that they do it themselves. Love has no age or genetic requirement. It's healthy for young siblings to make love, and it's unhealthy if they don't. Sexual repression of children fucks them up as adults. Because the parents are secretive about it, children get the idea that it's bad, which starts the process of sexual repression.

Gross. Yuck. Eww. I've run out of ways to express how disgusted I am with what you've said here. Ewwwwwww!!!!!!!

No, siblings should not make love. It is in our genetic interest that we don't do this. Ever. This is a cultural universal.


What did I just say?

Wed Mar 15 12:25 PM by mariareese in Pregnancy & Parenting

Looking to know about the system and biology :D hehe ..


Activities for 1-3 yo's

Sat Jan 14 7:07 PM by antfancier in Pregnancy & Parenting

I find theimaginationtree.com has lots of inspiring ideas. Some look like they take quite a bit of prep, but if you're doing it for a whole class then it might be worth it. You can sort activities by age as well so it's easier to search.


Academic redshirting

Wed Dec 7 8:22 PM by Nachos in Pregnancy & Parenting

I'm on the fence about this. I was always the youngest in my class because I was born 2 days before the cut off. I started school JUST after my 5th birthday (Go England.... not...) and this made a huge gap between me and the oldest kids in the class who were almost a whole year older. However, even though I might have struggled more then I'm ok now, you know? It might have even been helpful for me, pushing myself to learn more and try and be smarter. My sister was held back for a year in preschool in Germany because she didn't speak German well enough for the first grade and so she has always been the oldest in class and she's not really as academic as me. This is all anecdata of course, but interesting to ponder over.


kids' obsessions

Sat Oct 15 8:08 PM by melsbells in Pregnancy & Parenting

I could see saunas becoming an obsession for a number of very social reasons as well, depending on your family's sauna practices. I honestly can't think of any common themes or rituals shared by all branches of my U.S. family, other than like eating together, but that seems too banal(/essential for survival) to really become an obsession. My Finnish family, on the other hand, all sauna as a social ritual. Whether or not you allow your kid in saunas yet, if there's a lot of exposure to the ritual, they could probably pick up on the social importance. It might make sense that kids are probably wired to pick up on things that the adults in their life think are important (**not a child psychologist**).
<...> I know I was super into the instant evaporation of water and associated *hissssss* the first time I was in a sauna at like age seven.
This is an excellent point. And although I know they exist, I haven't encountered any Finns who don't like sauna. There are a lot of steps to it. The kid gets to help their grandfather build the fire when we're together, knows that wood burning saunas are better than electric saunas, and absolutely loves the sound of the water hitting the hot stones. I can't imitate the sound as well as the kid does.


Don't give your kids antidepressants.

Thu Sep 15 9:13 PM by Nachos in Pregnancy & Parenting

Mental health issues will never start to hurt, therefore no preemptive treatment is needed.

Mental health issues hurt, take it from me. There are many psychosomatic disorders out there which affect your body even though the real problem is in your mind. But to get better, you HAVE to treat both. Pre-emptive treatment also can stop some disorders from becoming too bad. And yes, sometimes drugs can be very very helpful.

I don't think you know what you're talking about and all this "I know because of divine intuition" bullshit is starting to piss me off. if you ask others for sources, be kind enough to provide some yourself.

If this thread continues to be shit-slinging, I will lock it.