Estimates how long it will take you to conceive based on age and average cycle length. Predicts the likelihood of being pregnant by a certain date.

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Probability of Conception on/by This Cycle |

Given a sufficiently large enough group of woman with the given fertility rate, we would expect only half of the group to have conceived by the

We estimate each year women in the same age group will have not conceived after cycles as a result of random chance, and not because any underlying infertility issues.

How long will it take you to conceive? Some women go into family planning with an unrealistic expectation of how easy it is to conceive each cycle. Others fret that they'll be one of the unlucky few who is can't conceive without reproductive assistance, even before they start trying. And some of us (myself included) are a simultaneously guilty of both.

The good news is that while the odds of conceiving any one cycle may be low, most women will be able to conceive in just a few cycles. The Time To Conception Estimator estimates your fertility rate based on your age, and then extrapolates to find the probability of conception within a year, as well as the expected number of cycles to conceive.

This website is intended to give us a little reassurance and help manage our expectations. Even if it's taking longer than you like to conceive, there is still a good chance that there may be nothing wrong. __ This website is not intended to be taken as medial advice.__ We are statisticians, not medical doctors. If you suspect a problem, please consult your medical professional.

Our modal uses the generally accepted, though rarely cited, probability of conception based on age (25% for those under 25, 20% for 25-30, 15% for 30-35, and 10% for 35-40). We note, however, that the chances of conception can significantly increase with optimal timing and frequency. [1] found couples who had intercourse ever two or every three days had a 35% chance of conception for those 16-26, and 20% for those 35-39. Even within an age group fertility rates can differ wildly [3]. Thus we give you the option to manually estimate your fertility rate. For a good overview on how timing of intercourse, and other factors, can affect conception we recommend [2].

To estimate the number of women of average fertility who do not conceive in cycles, we first estimate the number of women trying to conceive with average fertility in the specified age bracket. We start with the number of births for the age group, and remove an estimated possible number of women who may have needed fertility help, based on the assumed infertility rate for the age group [1]. We purposely over estimate the number of assumed couples with fertility assistance. As a result, we are under estimating the number of other women who failed to conceive as a result of random chance. Thus, no matter how long it is taking to conceive your child, you can be assured *you are not alone!*

- [1] Dunson DB, Baird DD, Colombo B. Increased Infertility With Age in Men and Women. Obstetrics & Gynecology: January 2004. Volume 103. Issue 1. Pages 51-56 doi: 10.1097/01.AOG.0000100153.24061.45
- [2] Pfeifer, Samantha et al. Optimizing natural fertility: a committee opinion. Fertility and Sterility: January 2017. Volume 107. Issue 1. Pages 52–58. doi:10.1016/j.fertnstert.2016.09.029
- [3] Sozou PD, Hartshorne GM (2012) Time to Pregnancy: A Computational Method for Using the Duration of Non-Conception for Predicting Conception. PLoS ONE 7(10): e46544. doi:10.1371/journal.pone.0046544

**Ready for the next step?** Once you become pregnant it's normal to worry about the possibility of miscarriage. Let us Reassure You, the odds of miscarriage are low. You can see the daily odds of miscarriage in our miscarriage chart. Our week by week calculator can show you when your little one's heart will start beating, and when you might feel the those first flutters.