Odds of getting pregnant by age calculator

About the Time to Conception Estimator

How long will it take you to conceive? Some of us 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 then there are those 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 people 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 individuals of average fertility who do not conceive in cycles, we first estimate the number of people 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 percentage of people 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 others 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.

Getting Pregnant After 35: What Are My Chances?

Odds of getting pregnant by age calculator

You’re hoping to make a baby and wondering about your chances at “advanced maternal age” (the medical term for women pregnant at 35 or later). Age is one of the key factors that predict your ability to conceive. Your fertility starts to decline at age 30 and keeps on dropping steadily until you hit menopause.

That said, it’s not only possible to deliver a healthy baby after age 35, it’s quite common. Here’s a look at the odds facing “older” mothers.

By the Numbers

You’re at your peak fertility in your 20s. Healthy women that age who are trying to conceive have about a 1 in 4 chance of getting pregnant during a single menstrual cycle. In other words, 25 out of 100 women will succeed per month.

By age 40, an average healthy woman has only a 5% chance of getting pregnant per cycle.

At the same time, the likelihood of miscarriage climbs with your age. A typical 40-year-old has about a 40% chance of losing the pregnancy. That compares to less than 15% for someone in their 20s. 

By the time you’re over 45, the American College of Obstetricians and Gynecologists says getting pregnant naturally is “unlikely for most women.”

Reasons for Fertility Drop

As you age, so do your eggs. And you have fewer of them, too. You’re born with all the eggs you’ll ever have in your life, about 1 million. By the time you hit puberty, you may have about 300,000 left. At 37, you’re down to just 25,000 -- or 2.5% of your starting count. That matters because the fewer eggs in your ovaries, the lower your odds for conception.

Even if you do get pregnant, your older eggs are more likely to have abnormal chromosomes, which may raise your chance of miscarrying your baby. Also, women after 35 are more likely to have problems like endometriosis and uterine fibroids that make it harder for you to get pregnant.

The quality of your partner’s sperm also matters. As men age, their sperm tend to swim slower and begin to lose their shape. But sperm quality doesn’t drop steeply until after men enter their 60s.

Your Options

Some older women trying to conceive may need more than just more time and help from Mother Nature. If so, several types of reproductive medicine may make pregnancy possible.

If you’re under 35, your doctor may recommend fertility treatments if you’ve tried without success to get pregnant for more than a year. That window shortens to 6 months if you’re 35 or older. And if you have any medical issues that could hurt your chances of conceiving, your doctor may advise that you get fertility help right away. They may suggest:

  • Drugs that stimulate egg production
  • In vitro fertilization (IVF)

If you know you’d like to have a baby someday but aren’t ready now, one option is to freeze your fertilized egg for IVF later. The quality of your embryos likely will be highest when taken closest to your most fertile years. A clinic will test your eggs for viability, or the chance that they’ll produce a healthy pregnancy.

Another option is to use an egg or embryo donor. A clinic will use a healthy egg from a younger woman and fertilize it with your partner’s sperm or donated sperm, and implant it in your uterus, so you can carry and deliver the baby.

What age is it hardest to get pregnant?

A woman's peak reproductive years are between the late teens and late 20s. By age 30, fertility (the ability to get pregnant) starts to decline. This decline becomes more rapid once you reach your mid-30s. By 45, fertility has declined so much that getting pregnant naturally is unlikely for most women.

What are the odds of getting pregnant by age?

Age and Fertility Research.

What is the most common age a woman gets pregnant?

Women in the United States are waiting longer than ever to get pregnant. The average age of first-time moms is nearly 27, according to the Centers for Disease Control and Prevention . Birth rates have risen among women in their 30s and dropped among those in their 20s.

What are my odds of getting pregnant?

Generally, a woman who's trying to get pregnant has between a 15% and 25% chance of doing so each month. Despite those odds, most couples conceive within the first year of trying.