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</noscript></div><div class="main"><div id="ency_summary"><p>A good way to decide if your weight is healthy for your height is to figure out your body mass index (BMI). You and your health care provider can use your BMI to estimate how much body fat you have.</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>Information</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-1"><p>Having <a test="test" href="./007297.htm">obesity</a> puts a strain on your heart and can lead to <a test="test" href="../patientinstructions/000348.htm">serious health problems</a>. These include:</p><ul><li><a test="test" href="./001243.htm">Arthritis</a> in your knees and hips</li><li><a test="test" href="./007115.htm">Heart disease</a></li><li><a test="test" href="./000468.htm">High blood pressure</a></li><li><a test="test" href="./000811.htm">Sleep apnea</a></li><li><a test="test" href="./000313.htm">Type 2 diabetes</a></li><li><a test="test" href="./001109.htm">Varicose veins</a></li></ul><p>HOW TO DETERMINE YOUR BMI</p><p>Your BMI estimates how much you should weigh based on your height. </p><p>There are many websites with calculators that give your BMI when you enter your weight and height. </p><p>You can also calculate it yourself:</p><ul><li>Multiply your weight in pounds by 703.</li><li>Divide that answer by your height in inches.</li><li>Divide that answer by your height in inches again. </li></ul><p>For example, a woman who weighs 270 pounds (122 kilograms) and is 68 inches (172 centimeters) tall has a BMI of 41.0.</p><p>Use the chart below to see what category your BMI falls into, and whether you need to be concerned about your weight.</p><table border="1" width="400"><caption>Use the chart to see what category your BMI falls into</caption><tbody xmlns="http://www.adam.com"><tr><th valign="top" scope="col"><strong>BMI</strong></th><th valign="top" scope="col"><strong>CATEGORY</strong></th></tr><tr><th valign="top" scope="row">Below 18.5</th><td valign="top">Underweight</td></tr><tr><th valign="top" scope="row">18.5 to 24.9</th><td valign="top">Healthy</td></tr><tr><th valign="top" scope="row">25.0 to 29.9</th><td valign="top">Overweight</td></tr><tr><th valign="top" scope="row">30.0 to 39.9</th><td valign="top">Obese</td></tr><tr><th valign="top" scope="row">Over 40</th><td valign="top">Extreme or high risk obesity</td></tr></tbody></table><p>There are three classes of obesity:</p><ul><li>Class 1: BMI of 30 to less than 35.</li><li>Class 2: BMI of 35 to less than 40. </li><li>Class 3: BMI of 40 or higher. Class 3 is considered "severe obesity."</li></ul><p>BMI is not always the best way to decide whether you need to lose weight. If you have more or less muscle than is normal, your BMI may not be a perfect measure of how much body fat you have:</p><ul><li><strong>Body builders</strong><em>--</em> Because muscle weighs more than fat, people who are very muscular may have a high BMI.</li><li><strong>Older people --</strong> Healthy weight ranges for older adults are different than for other age groups. The BMI only tells part of the story. Older adults with a normal BMI may have less muscle compared to others who are slightly overweight. If you are 65 years or older, a slightly higher BMI may help protect you from thinning of the bones (osteoporosis). Always talk to your doctor before trying to lose or gain weight.</li><li><strong>Children --</strong> While many children have obesity, DO NOT use this BMI calculator for evaluating a child. Talk to your child's provider about the right weight for your child's age. </li></ul><p>Providers use a few methods to decide whether you are overweight. Your provider may also take your waist circumference and waist-to-hip ratio into consideration.</p><p>Your BMI alone can't predict your health risk, but most experts say that a BMI of 30 or greater (obesity) is unhealthy. No matter what your BMI is, exercise can help reduce your risk of developing heart disease and diabetes. Remember to always talk to your provider before starting an exercise program.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Alternative Names</h2></div><div class="section-button"><button type="submit" aria-controls="section-Alt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Alt"><p>BMI; Obesity - body mass index; Obesity - BMI; Overweight - body mass index; Overweight - BMI</p></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Patient Instructions</h2></div><div class="section-button"><button type="submit" aria-controls="section-carepnt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div name="Patient Instructions" class="section-body" id="section-carepnt"><ul class="side-nav"><li><a href="../patientinstructions/000258.htm">After weight-loss surgery - what to ask your doctor</a></li>
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<li><a href="../patientinstructions/000259.htm">Before weight-loss surgery - what to ask your doctor</a></li>
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<li><a href="../patientinstructions/000172.htm">Gastric bypass surgery - discharge </a></li>
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<li><a href="../patientinstructions/000180.htm">Laparoscopic gastric banding - discharge </a></li>
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</ul></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Images</h2></div><div class="section-button"><button type="submit" aria-controls="section-tnails" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/24471t.jpg" alt="Calculating body frame size" title="Calculating body frame size" class="side-img"/><a href="../imagepages/17182.htm">Calculating body frame size</a></li>
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</ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>References</h2></div><div class="section-button"><button type="submit" aria-controls="section-Ref" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Ref"><p>Centers for Disease Control and Prevention website. BMI frequently asked questions. <a href="https://www.cdc.gov/bmi/faq/" target="_blank">www.cdc.gov/bmi/faq/</a>. Updated June 28, 2024. Accessed July 24, 2024.</p><p>Gahagan S. Overweight and obesity. In: Kliegman RM, St Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. <em>Nelson Textbook of Pediatrics. </em>21st ed. Philadelphia, PA: Elsevier; 2020:chap 60.</p><p>Jensen MD. Obesity. In: Goldman L, Schafer AI, eds. <em>Goldman-Cecil Medicine.</em> 26th ed. Philadelphia, PA: Elsevier; 2020:chap 207.</p><p>Lloyd JT, Alley DE, Hawkes WG, Hochberg MC, Waldstein SR, Orwig DL. Body mass index is positively associated with bone mineral density in US older adults. <em>Arch Osteoporos.</em> 2014;9:175. Epub 2014 Mar 25. PMID: 24664472. <a href="https://pubmed.ncbi.nlm.nih.gov/24664472/" target="_blank">pubmed.ncbi.nlm.nih.gov/24664472/</a>.</p><p>Ma M, Feng Z, Liu X, Jia G, Geng B, Xia Y. The saturation effect of body mass index on bone mineral density for people over 50 years old: a cross-sectional study of the US population. <em>Front Nutr.</em> 2021;15;8:763677. PMID: 34722617; PMCID: PMC8554069. <a href="https://pubmed.ncbi.nlm.nih.gov/34722617/" target="_blank">pubmed.ncbi.nlm.nih.gov/34722617/</a>.</p></div></div></section>
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<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 7/25/2022</h2></div><div class="section-button"><button type="submit" aria-controls="section-version" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<div id="section-version" class="section-body"><p>Updated by: Linda J. Vorvick, MD, Clinical Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. Editorial update 06/20/2023.</p>
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