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Pregnancy ProgressProbability of MiscarriageProbability of Birth
3 weeks
3 weeks, 1 day
3 weeks, 2 days
3 weeks, 3 days
3 weeks, 4 days
3 weeks, 5 days
3 weeks, 6 days
4 weeks
4 weeks, 1 day
4 weeks, 2 days
4 weeks, 3 days
4 weeks, 4 days
4 weeks, 5 days
4 weeks, 6 days
5 weeks
5 weeks, 1 day
5 weeks, 2 days
5 weeks, 3 days
5 weeks, 4 days
5 weeks, 5 days
5 weeks, 6 days
6 weeks
6 weeks, 1 day
6 weeks, 2 days
6 weeks, 3 days
6 weeks, 4 days
6 weeks, 5 days
6 weeks, 6 days
7 weeks
7 weeks, 1 day
7 weeks, 2 days
7 weeks, 3 days
7 weeks, 4 days
7 weeks, 5 days
7 weeks, 6 days
8 weeks
8 weeks, 1 day
8 weeks, 2 days
8 weeks, 3 days
8 weeks, 4 days
8 weeks, 5 days
8 weeks, 6 days
9 weeks
9 weeks, 1 day
9 weeks, 2 days
9 weeks, 3 days
9 weeks, 4 days
9 weeks, 5 days
9 weeks, 6 days
10 weeks
10 weeks, 1 day
10 weeks, 2 days
10 weeks, 3 days
10 weeks, 4 days
10 weeks, 5 days
10 weeks, 6 days
11 weeks
11 weeks, 1 day
11 weeks, 2 days
11 weeks, 3 days
11 weeks, 4 days
11 weeks, 5 days
11 weeks, 6 days
12 weeks
12 weeks, 1 day
12 weeks, 2 days
12 weeks, 3 days
12 weeks, 4 days
12 weeks, 5 days
12 weeks, 6 days
13 weeks
13 weeks, 1 day
13 weeks, 2 days
13 weeks, 3 days
13 weeks, 4 days
13 weeks, 5 days
13 weeks, 6 days
14 weeks
14 weeks, 1 day
14 weeks, 2 days
14 weeks, 3 days
14 weeks, 4 days
14 weeks, 5 days
14 weeks, 6 days
15 weeks
15 weeks, 1 day
15 weeks, 2 days
15 weeks, 3 days
15 weeks, 4 days
15 weeks, 5 days
15 weeks, 6 days
16 weeks
16 weeks, 1 day
16 weeks, 2 days
16 weeks, 3 days
16 weeks, 4 days
16 weeks, 5 days
16 weeks, 6 days
17 weeks
17 weeks, 1 day
17 weeks, 2 days
17 weeks, 3 days
17 weeks, 4 days
17 weeks, 5 days
17 weeks, 6 days
18 weeks
18 weeks, 1 day
18 weeks, 2 days
18 weeks, 3 days
18 weeks, 4 days
18 weeks, 5 days
18 weeks, 6 days
19 weeks
19 weeks, 1 day
19 weeks, 2 days
19 weeks, 3 days
19 weeks, 4 days
19 weeks, 5 days
19 weeks, 6 days
20 weeks
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Probability of Birth
Probability of Miscarriage

About the Daily Miscarriage Probability Chart

Knowing doesn't have to be scary. The Daily Miscarriage Probability Chart calculates the probability of miscarriage or, conversly, the probability of birth, given how far a woman is in her pregnancy. The probability chart can also account for added risk factors like maternal age, weight, the number of previous miscarriages and the number of previous live births.

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.


Pregnant? You may enjoy our other pregnancy apps like the Miscarriage Reassurer or the Personalized Week by Week Calander. When you are a little further along in your pregnancy, be sure to check out the Labor Probability Calculator.

Into Probability Distributions? You may also be interested in our Labor Probability Chart, which charts the probability of labor over time using a left skewed normal distribution.

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

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