Omni calculator
Last updated:

Chances of Having Twins Calculator

Table of contents

Types of multiple pregnancies — how do they happen?Factors that influence your odds of having twinsHow to calculate my chances of having twins — Chances of having twins calculatorHow can I increase my chances of having twins?FAQs

Double the trouble, double the fun, double the love! (Or maybe triple?) With our chances of having twins calculator, you can calculate what are the chances of having twins, triplets, or any other multiple pregnancy.

Multiple pregnancies are now a hot topic, as ARTs (assisted reproductive technology), such as in vitro fertilization, are making women more fertile and susceptible to twins. It is even possible to plan and estimate the due date prior to conception with IVF, with an IVF due date calculator.

As more and more women give birth to more than just one baby, you may ask, "Why is that a thing?", "What are my chances of having twins?", and "How to have twins?" Answers to these questions and more can be found in the article below.

We try our best to make our Omni Calculators as precise and reliable as possible. However, this tool can never replace a professional doctor's assessment. All information on this website is for informational purposes only and is not intended to serve as a substitute for medical consultation. Always consult your results with a healthcare provider.

Types of multiple pregnancies — how do they happen?

Multiple pregnancies aren't a common thing. One could say that this is natural — pregnancy is burdensome on the mother's body, as she has to feed the fetus and give it space to grow and develop until they are ready to be born. This day may be estimated with a due date calculator. In the cases of multiple pregnancies, things become more complicated.

What are the types of multiple pregnancies?

  • Monozygotic twins, where a single egg cell is fertilized by a single sperm cell. Later, it splits into two instead of growing into just one embryo. The children have the exact same genetic material and are always of the same sex. They also look identical.

  • Dizygotic twins, where two egg cells are released during one ovulation and then fertilized by two sperm cells. The ovulation day may be estimated with ovulation calculator. Our calculator is primarily concerned with this type of pregnancy, as it is more common and more influenced by external factors. The children look different, as their DNA is also different. They may be of two different sexes — akin to regular brothers and sisters.

  • Triplets, quadruplets, etc. The more babies that were conceived, the more eggs were fertilized by sperm cells. These types are increasingly less likely to happen naturally — 1 in 10,000 for triplets and 1 in 70,000 for quadruplets.

What are the chances of having twins, triplets, or quadruplets naturally?
For monozygotic twins, the chances are 0.3%. In the case of dizygotic twins, the odds go up to 0.4%. For triplets, the natural probability is 0.01%, and for quadruplets, it's a minuscule 0.00014286%.

Factors that influence your odds of having twins

There are several factors that either increase or decrease your chances of having dizygotic twins.

The most significant factor that affected the number of twin pregnancies recently is ART treatment, which causes them to increase dramatically. This is not limited to only in-vitro fertilization but also hormonal therapy.

How to have twins with natural methods? Well, unfortunately, there's not a lot you can do about it as it is mainly genetic. Most people know that having twins in their family gives them some hope they may conceive twins. Twins on the mother's side are more influential than on the father's.

Women with a BMI over 30 are slightly more likely to get pregnant with twins, which could be caused by hormonal activity, as excessive adipose tissue produces estrogens. BMI calculator for women may be of use to estimate this factor.

How to calculate my chances of having twins — Chances of having twins calculator

In the first box, you can choose what type of multiple pregnancies you want to calculate the odds for. The following result is the chance of a natural conception.

The rest of the calculator is designed for dizygotic twins. In this section, you'll find some questions that focus on known factors that increase the couple's chances of conceiving twins.

How can I increase my chances of having twins?

If your dream is to have twins or triplets, there's unfortunately not much you can do. Most of the factors affecting the probability are genetic or connected with your body weight. And risking obesity for the sake of increased chances for twins is not the best option.

You can always talk with your physician about ART (assisted reproductive technology), which includes pharmacotherapy or in-vitro fertilization, which puts your hormonal regulations at risk again.


What are my chances of having non-identical twins?

1 in 250 is the number for the general population. Keep in mind that your chances strongly depend on various factors like your genetics, ethnicity, age, weight, etc.

What factors affect the chances of having twins?

Your chances of getting pregnant with twins depend on your:

  • Genetics (history of twins in the family);
  • Height and weight (overweight women have twins more often); and
  • Fertility treatments (they increase your chances).

Where are the most twins born?

Most twins (more than 18 per 1,000 births) are born in the African countries of Benin, Nigeria, and Togo.

Scientists suspect that this high twinning rate is due to the diet, which is rich in foods that stimulate ovulation.

Overall chances of having a multiple pregnancy

Naturally, dizygotic twins occur only in 1:85 pregnancies.

What increases the chances of having dizygotic twins?


Interpretation: based on the answers, the chances of conceiving twins are not increased.

Check out 34 similar gynecology & pregnancy calculators 🤰
BBTBirth controlBishop score...31 more