The Fertility Calculator

Estimating Your Odds of Getting Pregnant

Hi, I’m Katelyn and I created this pretty awesome “how long until I get pregnant?!” calculator.

Just fill in your age, and the calculator will estimate the odds of becoming pregnant within either 1 month or 1 year. Trust me, the odds are probably a lot better than you think!

Estimating Your Odds of Getting Pregnant

Hi, I’m Katelyn and I created this pretty awesome “how long until I get pregnant?!” calculator.

Just fill in your age, and the calculator will estimate the odds of becoming pregnant within either 1 month or 1 year. Trust me, the odds are probably a lot better than you think!

Worried or relieved?

Now that I’ve either made you feel very relieved or incredibly panicked… let me tell you how this calculator works and what these numbers actually mean.

The odds generated from the calculator are based on averages taken from several scientific studies.1,2

This means that while it’s a great indicator of how likely it is that the average person of your age will conceive, it’s not personalized specifically to you.

It may take you longer than the average couple, or you could get lucky and get pregnant on your very first try.

You vs. Your Friend

The odds of getting pregnant in any given month is like flipping a coin for some, or rolling the dice for another

Most animals have a very high chance of conceiving, but we humans are somewhat lacking in our ability to get pregnant easily!

Some of it has to do with just plain ol’ bad luck, and for some it has to do with underlying fertility issues. For others, optimizing your fertility may be as simple as learning more about your fertile window!

Even though there may not be anything wrong with your fertility, sometimes you just have bad luck. Let me explain what I mean…

Just for fun; let’s assume you are a true fertile myrtle and have a whopping 50% chance of getting pregnant every month (an unrealistically high number, but hear me out!), and let’s assume your friend has a more realistic 16.7% monthly chance of conceiving.

To put it another way: you’ve been given a coin and need to toss heads, while your friend was given a dice and needs to roll a six.

You: You flip the coin and it lands on tails (not pregnant).

Your friend: She got lucky and rolled a 6! (pregnant!).

Although you had a higher likelihood of getting pregnant sooner, in the end, there’s still some luck involved.

Even though there may not be anything wrong with your fertility, sometimes you just have bad luck. Let me explain what I mean…

Just for fun; let’s assume you are a true fertile myrtle and have a whopping 50% chance of getting pregnant every month (an unrealistically high number, but hear me out!), and let’s assume your friend has a more realistic 16.7% monthly chance of conceiving.

To put it another way: you’ve been given a coin and need to toss heads, while your friend was given a dice and needs to roll a six.

You: You flip the coin and it lands on tails (not pregnant).

Your friend: She got lucky and rolled a 6! (pregnant!).

Although you had a higher likelihood of getting pregnant sooner, in the end, there’s still some luck involved.

pregnancy odds coin vs die

Most animals have a very high chance of conceiving, but we humans are somewhat lacking in our ability to get pregnant easily!

Some of it has to do with just plain ol’ bad luck, and for some it has to do with underlying fertility issues. For others, optimizing your fertility may be as simple as learning more about your fertile window!

Your Fertile Window is Shorter Than You Think

Did you know that only 13% of women are able to predict the date of ovulation? Even worse, close to half of all women have trouble identifying their fertile window!

Fun fact:
Do you think you ovulate on the 14th day of your cycle? Chances are, you’re not! Less than 10% of women ovulate on day 14!4

You can only get pregnant 5 to 6 days of your cycle, that’s it! So knowing exactly when you’re in your fertile window is crucial!

And if you don’t have sex when you’re in your fertile window? Well, it’s just not going to happen, you won’t get pregnant.

What is the One Thing You Should do to Get Pregnant Faster?

By far the most valuable thing you can do to increase the odds of conception is to educate yourself on how to recognize your most fertile days!

Learning how to accurately pinpoint your fertile window is easily the most important thing to do. For example, you can go low-tech and monitor your cervical mucus, or you could use Ovulation Predictor Kits (OPKs).

Not sure where to start? Follow me on Instagram where I share lots of Trying To Conceive (TTC)-related tips.

Fun Fact:
Having sex on a random day of your cycle is only going to lead to pregnancy 5% of the time.

References and other stuff for data nerds…

 

This Fertility Calculator is based on work done by two groups of researchers. First, the odds of becoming pregnant in any given month -by age- were estimated from Johnson et al. (2012). To extrapolate these odds (the so-called intrinsic conception rate) to the 1-year mark, the method described in Sozou et al. (2012) was used.‌

There are a few assumptions to the calculator:

1. We assume there are 12 cycles in 1 year, which means there are 12 ~30-day cycles in a year. If your cycles are longer, you may have fewer chances to conceive, and if your cycles are shorter, you may have a few extra shots at getting pregnant.
2. All estimates are based on numbers derived from many women. This means that since most couples in the general population don’t have fertility issues, the odds of conceiving are probably lower if you have a known fertility issue.
3. But… the model also assumes that you’re not doing anything special to try to conceive. For example, no timing of intercourse and no estimating when the window of peak fertility is.

This is good news because the odds of conceiving could go up substantially so long as you know what to look out for and know what to do (think: more sex, better timing). 

References:
1. Johnson et al. (2012). Delayed Child-Bearing. J Obst and Gyn Canada, 34(1), 80–93.
2. Sozou et al. (2012). Time to Pregnancy: A Computational Method for Using the Duration of Non-Conception for Predicting Conception. PLoS ONE, 7(10), e46544.
3. Wilcox et al. (2000). The timing of the “fertile window” in the menstrual cycle: day specific estimates from a prospective study. BMJ, 321(7271), 1259-1262.
4. Zinaman et al. (2012). Accuracy of perception of ovulation day in women trying to conceive. Cur Med Res and Op, 28(5), 749–754.

The Fertility Calculator is a fun way of estimating fertility, but in no way does it represent your odds of conception. There are many factors that come into play, far beyond just your age. This page, website, and calculator are not to be taken as medical advice.