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BMI & Fertility Calculator

Check your BMI and understand how it may impact your natural fertility and IVF treatment success.

Your BMI
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BMI is a general screening tool and does not account for muscle mass, body composition, or ethnicity-specific ranges.

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How BMI Affects Fertility

Body Mass Index (BMI) is a screening measure that relates your weight to your height. While it doesn't measure body fat or muscle directly, it's a widely used indicator in fertility assessments because both high and low BMI extremes can disrupt hormonal balance and ovulation.

A BMI in the normal range (18.5-24.9) is generally associated with more regular ovulation, better egg quality, and higher IVF success rates. Higher BMI (overweight/obese) can be linked to insulin resistance, PCOS, and lower response to fertility medications, while a very low BMI can suppress ovulation altogether.

Even a modest weight change (5-10% of body weight) toward the normal range has been shown to improve ovulation and fertility outcomes for many people. A fertility specialist or nutritionist can help create a personalised plan.

Frequently Asked Questions

What BMI is best for fertility? +
A BMI between 18.5 and 24.9 (normal range) is generally associated with the best natural fertility and IVF outcomes, though healthy fertility exists across a range of BMIs.
Does being overweight affect IVF success? +
Yes, higher BMI can be associated with lower egg quality, hormonal imbalances, and reduced IVF success rates, along with increased pregnancy complication risk. Even a modest weight reduction can improve outcomes.
Can being underweight affect fertility too? +
Yes, being significantly underweight can disrupt ovulation and hormone production, sometimes leading to irregular or absent periods, which can reduce fertility.
How much weight change actually helps fertility? +
Research suggests that even a 5-10% change in body weight toward the normal BMI range can meaningfully improve ovulation regularity and fertility treatment response for many people.

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