BMI and pregnancy: why the adult chart has limits
The short answer
This tool does not interpret pregnancy measurements. Pre-pregnancy BMI can be one input used by a healthcare provider, while pregnancy weight includes changes that an ordinary adult chart does not interpret. Do not use a current adult category as a pregnancy weight-loss target. CDC's US pregnancy guidance separates recommendations by pre-pregnancy context and number of babies; a personal plan belongs with the pregnancy care team.
This tool does not interpret pregnancy measurements. Pre-pregnancy BMI can be one input used by a healthcare provider, while pregnancy weight includes changes that an ordinary adult chart does not interpret. Do not use a current adult category as a pregnancy weight-loss target. CDC's US pregnancy guidance separates recommendations by pre-pregnancy context and number of babies; a personal plan belongs with the pregnancy care team.
Body mass index (BMI) is weight in kilograms divided by height in metres squared. It is one screening measure, not a diagnosis or a direct measurement of body fat.
Adults 20+. For ages 2–19, use a validated BMI-for-age calculator. This tool shows adult ranges only.
BMI is one screening measure, not a diagnosis or a weight goal. It does not distinguish muscle from fat and is not suitable for pregnancy.
The standard adult BMI formula is the same for women and men. The same BMI does not establish the same body composition or personal health risk.
This explanation checks the method and arithmetic. It does not claim an independent medical review. Personal interpretation requires context and an appropriate healthcare professional.
Sources
Sources below are in English.