BMI
Calculator
Free Body Mass Index Calculator for Men and Women. Calculate BMI in Imperial or Metric.
​​Use our free BMI calculator to assess your body mass index. Whether you prefer imperial (feet / pounds) or metric (centimeters / kilograms) units, our calculator provides accurate results for males and females.
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Total Body Mass Index
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Discover More About Your Numbers
Free Body Mass Index Calculator for Men and Women. Calculate BMI in Imperial or Metric.
What is BMI (Body Mass Index)?
Body Mass Index (BMI) is a widely used health screening tool that estimates body fat based on your height and weight. The BMI calculation provides a numerical value that healthcare professionals use to assess weight status relative to height.
BMI, also called body mass ratio or biomass index, was developed in the 1800s and remains one of the most common measurements used by doctors, nutritionists, and health organizations worldwide, including the CDC and WHO. While BMI doesn't directly measure body fat, research suggests it correlates with body fat percentage in population studies.
Maintaining a BMI within the suggested range (18.5-24.9) is associated with various health benefits in research studies, including better cardiovascular health, improved mobility and joint function, and enhanced overall wellbeing. Understanding your BMI can be a helpful first step in supporting your wellness goals.
BMI Calculator for Women and Men
This BMI calculator is designed for both women and men ages 18 and older. While the BMI formula is identical for males and females, it's important to understand that women and men naturally have different body compositions at the same BMI value.
If you searched for a BMI calculator specifically for women, you're in the right place. This calculator provides accurate BMI results for women using the same standard formula recognized by medical organizations worldwide. The formula itself doesn't change based on gender—a woman and man with the same height and weight will get the same BMI number.
However, what that number means can differ. Women typically have higher body fat percentages than men at the same BMI due to natural biological differences. For example, a woman with a BMI of 24 might have a body fat percentage of 30%, while a man at BMI 24 might have 20% body fat—yet both fall within the same BMI category.
Often women will search for "BMI calculator for women" or "BMI chart for women" wanting to understand how BMI applies to female body composition. The key is understanding that women's bodies naturally carry more essential body fat for reproductive health and hormonal function, which is completely normal and healthy.
Men generally have more muscle mass and less body fat than women at the same BMI values. Our BMI calculator for men uses the same standard body mass index formula to help you understand your weight status relative to your height.
Furthermore, while this BMI calculator is designed for adults of any age, BMI values may be interpreted differently across different life stages. For personalized interpretation of your results, consider consulting healthcare providers who can evaluate your individual circumstances.
Whether you're male or female, our free BMI calculator provides body mass index results in seconds. For the most complete picture of your health, consider using our Body Fat Calculator alongside BMI, as it accounts for gender-specific body composition differences.
How to Calculate BMI
Body Mass Index Formula
Calculating your body mass index is straightforward with the standard BMI formula. Our BMI calculator does the math instantly, but here's how BMI is calculated:
Imperial BMI Formula:
BMI = [Weight (lbs) ÷ Height (in)²] × 703
For example, if you weigh is 154 lbs and your height is 69 inches (5'9") — then your formula is:
BMI = [154 ÷ (69 × 69)] × 703 = [154 ÷ 4,761] × 703 = 22.7
Metric BMI Formula:
BMI = Weight (kg) ÷ [Height (m)]²
For example, if you weigh 70 kg and your height is 1.75 meters — then your formula is:
BMI = 70 ÷ (1.75 × 1.75) = 70 ÷ 3.06 = 22.9
Rather than calculating BMI manually, our Body Mass Index Calculator provides instant results in either metric or imperial units. Simply choose your preferred measurement system, enter your height and weight, and click calculate. Our online BMI calculator uses the same standard formulas shown above—giving you quick results without the need for manual calculation.
Imperial and Metric BMI Calculator
Choose Your Preferred Units
Our BMI calculator offers both imperial and metric measurement options, making it accessible for users anywhere in the world.
Imperial BMI Calculator (US Standard):
If you're in the United States or prefer pounds and feet/inches, use our imperial body mass index calculator. Enter your height in feet and inches and your weight in pounds. The calculator automatically applies the standard imperial BMI formula (weight in lbs / height in inches² × 703) to calculate your body mass index.
Metric BMI Calculator (International Standard):
If you're outside the United States or prefer kilograms and centimeters, use our metric body mass index calculator. Enter your height in centimeters and your weight in kilograms. The calculator automatically applies the standard metric BMI formula (weight in kg / height in meters²) to calculate your body mass index.
Toggle between imperial and metric measurements with one click. Whether you're more comfortable with pounds and inches or kilograms and centimeters, our body mass index calculator adapts to your preference—no manual conversions needed.
Both measurement options use the same standard BMI calculation formulas recognized worldwide. Simply choose the system that's most convenient for you.
BMI Chart
Understanding Your Body Mass Index Results
Once you calculate your BMI, understanding what your body mass index number means can provide useful context. The BMI chart below shows standard weight status categories established by the World Health Organization (WHO) and Centers for Disease Control (CDC).
BMI Category
Range
Underweight
Less than 18.5
Normal Weight
18.5 - 24.9
Overweight
25 - 29.9
Obesity (Class I)
30 - 34.9
Obesity (Class II)
35 - 39.9
Obesity (Class III)
More than 40
BMI Chart for Women
Women can use this same BMI chart and body mass index chart for reference. The categories are the same for both genders, though women and men typically have different body compositions at the same BMI value. Furthermore this standard BMI chart applies to women (and men) at any age because age is not factored in traditional BMI testing. The BMI index chart provides general population-level guidelines—individual body composition and health status vary significantly.
BMI Chart for Men
This standard body mass index chart and is applicable for men at any age. Keep in mind that BMI doesn't distinguish between muscle and fat, so individuals with higher muscle mass may have elevated BMI values despite lower body fat percentages.
BMI Chart Limitations
The BMI chart is a screening tool used for population assessment and is not a diagnostic tool for individual health. Your position on the BMI graph or BMI table should be considered alongside other health metrics like body fat percentage, waist circumference, physical fitness level, and consultation with healthcare providers for personalized assessment.
What is a Healthy BMI Range?
The standard BMI range often referred to as "healthy" for most adults is 18.5 to 24.9. This range, established by the World Health Organization (WHO) and Centers for Disease Control (CDC), is associated with lower health risks in population studies. However, it's important to understand that BMI is a screening tool, not a definitive measure of individual health.
Understanding the "Healthy BMI" Range
A BMI within the normal weight range doesn't indicate overall health status, and a BMI outside this range doesn't determine health outcomes. Individual factors like muscle mass, bone density, age, body composition, and physical fitness contribute to health in ways BMI cannot measure.
BMI Range Interpretation for Different Groups
While the BMI calculation formula is the same for everyone, interpretation may vary by individual circumstances. For example, individuals with higher muscle mass may have BMI values in the overweight range. Similarly, body composition changes across the lifespan may affect how BMI values are interpreted.
Beyond BMI Range Numbers
Your BMI number is one metric among many health indicators. Body fat percentage, waist circumference, blood pressure, cholesterol levels, and physical fitness are all important measures to consider. For a more comprehensive view, explore our Body Fat Calculator and TDEE Calculator, and consult healthcare professionals for personalized health assessment.
What Does My BMI Number Mean
Your BMI number provides information about your weight relative to your height. Understanding what your body mass index number means involves considering multiple factors.
Interpreting Your BMI Number
If your body mass index calculation shows a BMI of 22, for example, this falls into the normal weight category (18.5-24.9) as defined by the WHO and CDC. This BMI value is within a range that population studies have examined. However, BMI is just one measurement and doesn't reflect your complete health picture.
BMI Number and Body Composition
Two people with the same BMI number can have very different body compositions. For example, someone with a BMI of 27 might have a high muscle mass to lower fat ratio, compared to another person with a BMI of 27 with a lower muscle mass to a higher fat ratio. Your BMI number doesn't measure body composition—it's simply a calculation based on height and weight.
BMI Number in Context
Research has examined correlations between BMI ranges and various health patterns in large population studies. These are statistical associations observed at the population level. Individual health is influenced by multiple factors including genetics, lifestyle, physical activity, nutrition, and medical history that BMI cannot measure.
Using Your BMI Number
Understanding your BMI number helps you see where your current weight falls within standard health ranges and can serve as a starting point for setting realistic health goals. While BMI provides useful baseline information, it works best when considered alongside other health metrics like body composition, activity level, and overall wellness rather than as a single measure of health.
Beyond the BMI Number
Rather than focusing only on your BMI value, consider multiple aspects of wellness. Energy levels, physical capabilities, and how you feel day-to-day matter. When combined with other health metrics like body fat percentage, blood pressure measurements, and fitness assessments, your BMI number provides one piece of information for understanding your wellness.
Why Your Body Mass Index
Matters for Health and Wellness
Understanding your BMI can provide context about weight status relative to height. While body mass index is one health metric, it's part of a broader health assessment picture.
Research has examined correlations between BMI ranges and various health patterns in population studies. Studies suggest that BMI values in the normal weight range (18.5-24.9) have been associated with certain health patterns in large-scale research, though individual outcomes vary significantly based on multiple factors.
Healthcare professionals may use BMI as one initial screening measurement among many health assessments. BMI provides a starting point for conversations about weight status, nutrition, and wellness. However useful, BMI is only a foundational metric and does not give an exact or definitive evaluation of individual health.
Whether you're monitoring your weight, tracking wellness goals, or simply curious about your body mass index, knowing your BMI number can provide one reference point. Our BMI calculator offers baseline information that may inform your wellness decisions.
For a more comprehensive view, consider exploring multiple health metrics. Our Body Fat Calculator provides additional body composition information, while our TDEE Calculator helps estimate daily calorie needs. For personalized health guidance tailored to your individual circumstances, consult qualified healthcare professionals.
How to Improve Your BMI
If your BMI calculation shows a number outside your desired range, various lifestyle approaches exist that may support your wellness goals. Keep in mind that working toward a different BMI value is about developing sustainable habits, not just changing a number.
Since BMI is calculated from height and weight, and adult height remains constant, changes in BMI reflect changes in weight. Sustainable lifestyle modifications may affect weight over time. The focus is on adopting habits that support your overall wellbeing rather than targeting a specific BMI number.
Nutrition Support
Registered dietitians can provide personalized eating plans based on individual needs and preferences. General nutrition principles include whole foods, portion awareness, and balanced macronutrients. Our Calorie Calculator and Macro Calculator offer informational starting points for exploring nutritional concepts, though individual needs vary significantly.
Physical Activity
The CDC provides general physical activity guidelines suggesting 150 minutes of moderate-intensity activity weekly for adults. Finding enjoyable activities—such as walking, swimming, cycling, or strength training—may help make movement a sustainable part of your routine. Individual activity needs and abilities vary.
Sleep and Stress Factors
Sleep quality and stress levels can influence various aspects of wellness. Research suggests most adults function well with 7-9 hours of sleep a night. Stress management approaches like meditation, yoga, or professional counseling exist as options some people find helpful.
Professional Consultation
If you have questions about your BMI or weight management, healthcare providers can offer guidance specific to your individual circumstances. Medical factors can influence weight, and some individuals may explore medically supervised programs. Healthcare professionals can assess your specific situation and discuss options appropriate for you.
Approach and Expectations
Gradual, consistent changes are generally more sustainable than sudden dramatic shifts. Rather than focusing solely on achieving a specific BMI number, consider developing habits you can maintain over time. How you feel, your energy levels, physical capabilities, and various health indicators provide a broader picture beyond BMI value alone.
Additional Resources
Explore our related calculators for more information about health metrics. Our TDEE Calculator provides estimates of calorie expenditure, while our Body Fat Calculator offers additional body composition estimates. These informational tools, along with guidance from qualified healthcare professionals, may inform your wellness approach.
BMI Limitations
What Body Mass Index Doesn't Tell You
BMI is a commonly used screening measurement, but understanding its limitations helps provide context for your results. The BMI calculation uses only height and weight—it doesn't distinguish between muscle tissue and fat tissue. Individuals with higher muscle mass, such as athletes and strength trainers, may have elevated BMI values despite lower body fat percentages. This is because muscle tissue is denser than fat tissue.
While the BMI formula is the same for men and women, body composition typically differs by gender. Women generally have higher body fat percentages than men at equivalent BMI values due to biological differences. Additionally, body composition changes across the lifespan, which may affect how BMI values are interpreted at different ages.
Multiple factors influence body composition, including bone density, muscle mass, ethnicity, and genetics. BMI is a population-level screening tool, and individual body composition varies significantly. Research has shown that BMI may have different associations in different population groups.
Consider BMI as one measurement tool among many available health assessments—not a complete health evaluation. For personalized assessment of your individual health status, consult qualified healthcare professionals who can evaluate multiple health indicators specific to your circumstances.
Related Calorie and Metabolism Calculators
Explore Additional Body Metrics with These Related Calculators
01
Body Fat Calculator
While BMI uses height and weight, a body fat calculator provides a different approach to assessing body composition. Calculate your estimated body fat percentage for additional body composition information.
02
TDEE Calculator
Estimate how many calories your body may burn daily with our TDEE (Total Daily Energy Expenditure) calculator. Useful for understanding calorie expenditure patterns and nutrition planning.
03
Calorie Deficit Calc.
Exploring weight management? Our calorie deficit calculator helps estimate calorie intake based on your goals and activity level. Provides informational calorie targets.
Frequently Asked Questions
About BMI Calculators
Q: Is the BMI calculator accurate for both men and women?
A: This BMI calculator uses the standard body mass index formula that applies to both men and women ages 18 and older. The calculation method is the same for both genders, though men and women typically have different body compositions at the same BMI value.
Q: Should I use the imperial or metric BMI calculator?
A: Both measurement options use the same standard BMI formulas—choose whichever system you're most familiar with. Imperial uses pounds and feet/inches, while metric uses kilograms and centimeters. Your BMI result will be the same regardless of which unit system you select.
Q: What BMI range is considered normal for women?
A: The standard BMI range considered normal weight is 18.5 to 24.9 for both women and men according to WHO and CDC classifications. However, women typically have higher body fat percentages than men at equivalent BMI values due to biological differences.
Q: How often should I calculate my BMI?
A: Since BMI reflects weight changes over time, monthly calculations are generally sufficient for tracking trends. BMI typically changes gradually, so daily or weekly calculations usually aren't necessary for most monitoring purposes.
Q: Is BMI the same as body fat percentage?
A: No, these are different measurements. BMI is calculated using height and weight, while body fat percentage estimates the proportion of fat tissue in your body. BMI doesn't directly measure body fat.
Q: Can I use this BMI calculator during pregnancy?
A: BMI interpretation during pregnancy differs from standard use. For appropriate weight monitoring during pregnancy, consult your healthcare provider who can provide guidance specific to your pregnancy.
Q: What if my BMI is outside the 18.5-24.9 range?
A: BMI is one screening measurement among many health indicators. If your BMI falls outside the normal weight range and you have questions or concerns, healthcare professionals can provide personalized assessment based on your individual health profile and circumstances.
Q: Does this BMI calculator work for athletes?
A: This calculator uses the standard BMI formula that applies to all adults. However, BMI has limitations for individuals with high muscle mass, as it doesn't distinguish between muscle and fat tissue. Athletes may want to use additional body composition measurements like our body fat calculator alongside BMI.
Q: Are BMI calculators for men and women different?
A: No, BMI calculators for men and women use the same formula. The term "BMI calculator for women" or "BMI calculator for men" refers to the same calculation—though interpretation of results may be gender-specific.
A Note from Health Calcz
Disclaimer* - This BMI calculator provides educational information based on standard body mass index formulas. Results are estimates for informational purposes only and should not be used for medical diagnosis or treatment decisions. BMI is a screening tool with known limitations. It doesn't measure body composition directly and may not reflect individual health status. Factors including muscle mass, age, and medical history affect body composition in ways BMI cannot assess. This tool and information are not medical advice and don't replace consultation with qualified healthcare professionals. For personalized health assessment, weight management guidance, or concerns about your BMI results, consult your doctor or registered dietitian. If you have questions about your health or weight, contact your healthcare provider.