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Evidence Based
Use the Legion BMI Calculator to calculate your body mass index (BMI). Enter your preferred unit of measurement, height, and weight, and the calculator will indicate whether you’re a healthy weight for your height.
What Is BMI?
Body mass index (BMI) is a numeric expression of the relationship between height and weight.
Doctors, personal trainers, and other healthcare professionals commonly use BMI to determine if someone is over, under, or average weight.
Although not as accurate or useful as your body fat percentage or body composition, BMI gives you a general idea of whether a person’s weight will increase their chances of suffering a range of health conditions.
A healthy BMI is 18.5 to 24.9. Below this is considered a low BMI, and above it is a high BMI.
BMI Table
Here are the World Health Organization’s (WHO) recommended body weight guidelines for adults based on BMI values. These recommendations apply to both men and women aged 20 and above.
BMI Chart
A BMI chart is a table or graphic that helps you find which weight category you belong to based on your BMI.
The Risks of Being Overweight
Being overweight puts you at a significantly higher risk of health problems.
Research shows that having a high body fat percentage increases your risk of developing conditions like heart disease, hypertension, type 2 diabetes, certain cancers, and stroke.
Moreover, maintaining a healthy weight can enhance your mental health. Obesity and depression often go hand in hand, with the emotional stress of being overweight potentially resulting in low self-esteem and anxiety.
The Risks of Being Underweight
Being underweight can be just as detrimental to health as being overweight, though it presents a set of risk factors distinct from those associated with obesity.
These can include weakened immune function, a higher susceptibility to infections, decreased muscle mass and strength, and fertility issues.
Certain body types are naturally leaner, but when weight drops below a healthy range (a BMI of 18.5 to 24.9) for one’s body structure, these risks become more prevalent.
Additionally, being significantly underweight may indicate underlying health problems, such as thyroid, digestive, or eating disorders. Understanding the difference between a naturally lean body type and being unhealthily underweight is crucial for maintaining optimal well-being.
Are BMI charts accurate for muscular men?
BMI calculators often classify muscular, lean people as “overweight” because BMI calculators only account for total body weight and not body composition.
Thus, if you know you’re fairly lean (less than 15% body fat for men or 25% body fat for women), don’t worry if you’re “overweight” according to a BMI calculator—research shows this isn’t unhealthy.
That said, if a BMI chart classifies someone as “obese,” there’s virtually no chance this is due to naturally high levels of muscle mass. Either the person is carrying more body fat than they realize, or they’re taking steroids.
BMI Formula
Calculating your body mass index is simple—you just need to know your height and weight.
The formula is BMI = kg/m2, where “kg” is the person’s weight in kilograms and “m2” is their height in meters squared.
You can calculate your BMI using this formula, or use the Legion BMI Calculator to arrive at the same answer (in less time).
+ Scientific References
- Keramat, Syed Afroz, et al. “Obesity and the Risk of Developing Chronic Diseases in Middle-Aged and Older Adults: Findings from an Australian Longitudinal Population Survey, 2009–2017.” PLoS ONE, vol. 16, no. 11, 16 Nov. 2021, p. e0260158, www.ncbi.nlm.nih.gov/pmc/articles/PMC8594821/, https://doi.org/10.1371/journal.pone.0260158.
- Lavallee, Kristen L., et al. “Obesity and Mental Health: A Longitudinal, Cross-Cultural Examination in Germany and China.” Frontiers in Psychology, vol. 12, 21 Sept. 2021, https://doi.org/10.3389/fpsyg.2021.712567.
- Goonasegaran, Arvin Raj, et al. “Comparison of the Effectiveness of Body Mass Index and Body Fat Percentage in Defining Body Composition.” Singapore Medical Journal, vol. 53, no. 6, 1 June 2012, pp. 403–408, pubmed.ncbi.nlm.nih.gov/22711041/.
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We just . . . wait for it . . . give you your money back. No returns. No forms. No nonsense. Holy moo cows.
That means you can say “yes” now and decide later. You really have nothing to lose.
Free Worldwide Shipping & Returns
Many companies use shipping and handling fees to increase their profit margins, but here at Legion, we hate profits, so our shipping is free!
Okay, so we do dig on profits, but we also go in for happy customers, and free shipping works like gangbusters. So, if you’re outside the USA, your order ships free when it’s over $199.
Why the restriction on international orders? Unfortunately, shipping abroad is very expensive, and if we didn’t require a minimum order size, we’d lose a lot of money. But! We’re also hustling to improve our international logistics and will be passing our savings along to our international customers.
Also, if you don’t absolutely love our stuff for whatever reason, we don’t request you deliver it to a PO box in the Gobi Desert by carrier pigeon.
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