‘When to Expect’ Claims It Can Predict Your Actual Due Date -- But How Accurate Is It?

Say What!? 14

due dateOkay, you have your due date. But we all know it's just an estimate. You could be two weeks early, you could be two weeks late. Hell, you could be a whole month early! You never really know when to expect your baby -- only that your pregnancy will not last as long as a rhinoceros' (15 to 16 months). But deep down, don't you kind of wish you knew for sure?

A new website, WhenToExpect.com, claims it can tell you how close to your due date you'll actually deliver. Really! Oh -- you're skeptical? Yeah, well, so am I. But you know what? If I were pregnant, I'd be trying it out anyway.

So here's how this thing works: They've analyzed U.S. Census data on live births for the years 2009 and 2010. Then they calculated predicted birth dates "based on certain characteristics." You just enter some information about your pregnancy: Gender, how many, your age, education, racial/ethnic group, and your history with diabetes and/or hypertension. Plug in the info, and they'll give you their prediction.

Just out of curiosity, I decided to pretend it's January 2004 and I'm expecting my little boy. I entered all my info just to see how close it would come to reality. And???

Hmm, they seemed to think I would deliver a week earlier than I actually did. (I gave birth three days after my due date.) They also put my chances of a c-section at 35 percent. Yikes! I didn't even come close to having a c-section, and I'm not sure why my chances were so high since I have no history of diabetes or hypertension.

They also estimated my son's weight, which ... OMG, would you believe it? I can't remember my son's exact birth weight. It was 7 pounds something ounces. They estimated 7 pounds 14 ounces, which is probably pretty close.

So I'm not sure what to think. I guess my son's birth wasn't quite as typical as I'd always thought. Obviously there are far more factors that go into your actual delivery date than what you see here -- and they do tell you as much. I'm curious now to see how other people's births will measure up to this, though.

Is WhenToExpect.com the kind of thing you'd try out of curiosity? How close do you think it'll be?


Image via Scott Woods-Fehr/Flickr

labor & delivery


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Sirena Robinson

It claims I would deliver at 43 weeks with a 20% chance of C-section. I delivered at 36 weeks naturally.

aeneva aeneva

Okay so I played along.  My first was 10 days early and they have him coming 5-7 days early.  26% chance of c-section and not even close.  Weight over by 2 ounces though.  Second got the week right, upped chances of c-section to 30% and again not even close.  Weight under by 4 ounces.  It is statistics at it's finest.  Statistically it is correct, but nothing can tell you when you are going to have your baby.

mamab... mamabear1020

wont work for me.. keep getting "


Please check the due date you entered. This calculator only works for current pregnancies (due dates no more than three weeks in the past or 40 weeks in the future).

Lesley Rae King

I finally got it to work. Of course, I don't know how accurate it is since I am not due until June, but: it says I am most likely to deliver within the week before my due date. (My last baby was born naturally on her due date, so maybe.) Chance of a c-section is 37% (my first, twins, were born by c-section at 37w4d, a planned, scheduled, non-emergency c-section because they were both breech and too big to turn. However, the next baby was a 100% natural, drug-free vbac, and I'm using the same midwives at the same hospital this time, so.... hard to say.) Expected birth weight: 7 lbs 13 oz. (HAHAHAHAHA! Not likely.... The twins, born before 38 weeks, were 6.15 and 7.15, and #3, a girl, was 9.6. I expect this boy will be more like 9.13 than 7.13.... but we'll see!)


climb... climbz4coffee

I had identical twins last August so I did it for this August same info. They were dead-on at the week. I delivered at 37 weeks AND the twins were both extremely close to 5 lb 3 oz. However, there was a 73 % chance of c-section, and I didn't need one. 

femal... femaleMIKE

I am going to try it.  I am due in July

lovem... lovemy2sons25

How do you not remember your childs birth weight? Thats something that seems awfully important to forget... Just my opinion... Dont you have a baby book or anything from the hospital with his weight wrote down on it?

kttyc... kttycat84

Didn't work for me at all. It said I'd deliver a week early with my oldest, she'd be 7 lbs 4 ounces and that I had a 25% chance of a c-section. I was induced at 41 weeks, had to fight tooth and nail to delivery naturally when the induction didn't work as fast as the docs wanted and she was 8 lbs 9 oz. It was way off with my other two too, lol.

verax... veraxaudeo

The only part that it got right was his birth weight. It estimated 8lbs, 0oz and he was 7lbs, 15.7oz at birth (they just called it an even 8lbs). I had him at 38w1d because I ended up diagnosed with pre-e just after my 38 week appt at 37w5d.

lilli... lillismom2012

omg it was right about my baby!!! lol this is pretty cool


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