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BMI Calculator

Calculate Body Mass Index (BMI) to assess whether your weight is within a healthy range

BMI Calculator

Calculate your Body Mass Index

cm
kg

How does this calculator work?

  1. 1 Enter your height in centimeters
  2. 2 Enter your weight in kilograms
  3. 3 See your BMI value and weight category

How Does BMI Affect Pregnancy?

BMI = weight (kg) ÷ height (m)². It is the standard international index for judging whether weight sits in a healthy range; normal is 18.5–24.9.

A BMI under 18.5 can disrupt ovulation and cause infertility. At 25 or above, ovulation, conception, and pregnancy-complication risk are affected; at 30+, IVF success rates fall noticeably.

Before trying to conceive, aim for 18.5–24.9. With a BMI over 35, clinics may recommend weight loss before IVF, since obesity increases medication doses, retrieval difficulty, and pregnancy complication risk.

BMI is only a screening tool and does not capture overall health — muscular people can register high while being healthy. Consider it alongside body-fat percentage and waist circumference.

What Is the BMI Formula?

Body Mass Index (BMI) is the internationally accepted measure for assessing whether your weight falls in a healthy range.

BMI = weight (kg) ÷ height (m)²

How Does BMI Affect Trying to Conceive?

  • • The ideal BMI range is 18.5–24.9
  • • Being underweight can disrupt ovulation
  • • Being overweight can reduce IVF success and affect pregnancy outcomes
This calculator is for reference only and does not replace professional medical advice. Please consult your doctor for personalized guidance.

Frequently Asked Questions

How does BMI affect pregnancy?
Both high and low BMI can affect ovulation, fertility, and the risk of pregnancy complications. Aim for a healthy range before trying to conceive.
Does a normal BMI guarantee fertility?
No. BMI is one factor among many — age, tubal function and sperm quality also matter.
What BMI is best for IVF?
A BMI of 18.5–30 is considered suitable for IVF. Above 35 clinics may ask you to lose weight first; below 18.5 you may need to gain.
How should I read my BMI when planning pregnancy?
Under 18.5 may impair ovulation; 18.5–24.9 is healthy for conception; 25–29.9 suggests modest weight loss; 30+ warrants a medical consultation.

References

  • [1] The WHO recognizes BMI as the standard tool for relating weight to health, with a normal range of 18.5–24.9 — WHO - BMI Classification
  • [2] ASRM notes that both high and low BMI can affect IVF success rates and pregnancy outcomes — ASRM - BMI and Fertility

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