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The single most important lifestyle factor for fertility is keeping your weight within the optimal BMI range of 20-25. Studies show that being overweight or underweight can negatively affect your fertility and increase health and safety risks during IVF treatment.

The Body Mass Index is a measure that uses your height and weight to work out if your weight is healthy. Use our simple calculator to check your BMI:

BMI Calculator

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BMI Calculator

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What is BMI (Body Mass Index)?

BMI is a way of measuring body fat by looking at your weight in relation to your height. A healthy diet, including a balance of food groups, vitamins and minerals, is essential for a healthy BMI.

How does BMI affect fertility?

Studies show that overweight women took twice as long to fall pregnant as women of a healthy weight, while underweight women took 4 times as long. There are also increased health and safety risks in IVF treatment for women who are over or under the BMI limit.


NHS advice says that ‘being overweight or underweight can affect your chances of conceiving. Too much or too little body fat can make your periods irregular or stop them completely, which can affect your ability to conceive.’

What is a optimal BMI if I’m trying to conceive?

The single most important lifestyle factor for fertility is keeping your weight within the optimal BMI range of 20-25.

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