screenshot
Daily Probability Chart
How Far Along Are You?

Weeks: Days:

Maternial Age:
Number of Previous Miscarriages:
Number of Previous Live Births:
Height:
Weight:
All Fields Optional
Reassure Me
Give it to me Straight

About the Miscarriage Reassurer

Nervous about the possibility of a miscarriage? The fear of miscarriage is one of the biggest fears women have during pregnancy. We all know someone whose had it happen to them, or maybe it's happened to us. Yet, while miscarriage is common, it is not the likely outcome. Once a woman becomes pregnant the pregnancy is more likely to result in a baby than to end in a miscarriage. The Miscarriage Odds Reassurer is designed to remind us of this fact, and ease our fears.

The Miscarriage Odds Reassurer calculates the probability of miscarriage given how far a woman is in her pregnancy. Rather than simply give the probability of a miscarriage, however, the reassurer can also tell you how likely her pregnancy is to continue. The reassurer will let you know how much lower the probability of miscarriage is now than when your pregnancy first started, and how much lower yet they'll still be in the next couple of days. The reassurer can even account for added risk factors like maternal age, weight and number of previous miscarriages.

The underlying model for this website was derived using meta analysis of the following peer reviewed papers on miscarriage. The model can be be used without additional input, or can be adjusted with any combination of maternal age, height/weight (BMI), number of previous miscarriages and number of previous births inputs. Each variable is modeled separately, assumed to be independent and assumed to affect the probability of miscarriage uniformly over time. These assumptions are likely overly strong, but are the most reasonable approximation in the absense of additional data.

This website is intended for informational & entertainment purposes only. This website is not intended to be considered medical advice.

Love Numbers? You may also be interested in the Daily Miscarriage Probability Chart, which can present the daily odds of miscarriage (or the odds of not miscarrying) as either a table or a graph.

Obviously anything can happen, and knowing the chances of a miscarriage are smaller than the chances of a happy ending brings little comfort to those it happens to. My deepest condolences to anyone whose ever suffered a loss. This app is dedicated to a dear friend whose had more than her fair share of bad luck.


Pregnant? You may enjoy our other pregnancy apps like the personalized week by week calander.

Wanting to become pregnant? Our Time to Conception Calculator can estimate how long it may take.

About · Terms of Use · Privacy Policy · Contact