BMI Calculator
Accurately gauge your health with our easytouse BMI calculator.
Modifiy The Values And Click The Calculate Button To Use
Result
 Healthy BMI range: 18.5 kg/m ^{2}  25 kg/m ^{2}
Introduction to BMI Calculator
The Body Mass Index (BMI) Calculator offers a comprehensive approach to determine BMI value and associated weight status, considering age as a factor. The calculator provides options to work with Metric Units or convert units to US or metric standards.
Understanding BMI
BMI, a measure based on height and weight, quantifies tissue mass and indicates a person's leanness or corpulence. It serves as a general indicator of whether one maintains a healthy body weight relative to their height. BMI values help categorize individuals as underweight, normal weight, overweight, or obese, guided by predefined ranges that vary across regions and age groups. These categories further encompass subcategories, like severely underweight or very severely obese, indicating the significance of maintaining an optimal BMI. Although BMI isn't flawless, it prompts the need for further evaluation if one is underweight or overweight.
BMI Classifications and WHO Recommendations
The provided table outlines World Health Organization (WHO) recommended body weight classifications based on BMI values for adults aged 20 and above. This data applies to both men and women and serves as a vital benchmark for assessing health in relation to BMI.
BMI Categories for Adults: Visual Representation
Presenting a visual depiction of BMI classifications, this chart is derived from World Health Organization data. The chart includes dashed lines that denote subdivisions within broader categorizations.
BMI Reference Table for Children and Teens (Ages 220)
For children and teenagers aged 2 to 20, the Centers for Disease Control and Prevention (CDC) provides BMI categorization guidelines.
Risks Associated with Weight: Overweight and Underweight
Risks Associated with Being Overweight
Being overweight poses substantial risks to health, as highlighted by the Centers for Disease Control and Prevention (CDC). The following health hazards are linked to excess weight:
 High Blood Pressure
 Imbalanced Cholesterol Levels (High LDL, Low HDL, High Triglycerides)
 Type II Diabetes
 Coronary Heart Disease
 Stroke
 Gallbladder Disease
 Osteoarthritis
 Sleep Apnea and Breathing Problems
 Certain Cancers (Endometrial, Breast, Colon, Kidney, Gallbladder, Liver)
 Reduced Quality of Life
 Mental Illnesses (Depression, Anxiety, etc.)
 Physical Discomfort and Impaired Function
 Elevated Mortality Risk
Striving for Health: Managing Weight
Maintaining a BMI below 25 kg/m² is generally recommended, though consulting a physician is crucial to assess lifestyle adjustments for improved health.
Risks Associated with Being Underweight
Being underweight also presents its own set of risks, encompassing:
 Malnutrition, Vitamin Deficiencies, Anemia
 Osteoporosis and Bone Weakness
 Weakened Immune Function
 Growth and Development Impairments
 Reproductive Complications for Women
 Surgical Complications
 Elevated Mortality Risk
Exploring Causes and Solutions
Underweight may signal underlying conditions like anorexia nervosa. Seeking medical consultation is essential for a comprehensive understanding of underweight concerns.
Exploring the Limitations of BMI
BMI and Its Scope
BMI is a valuable tool for gauging healthy body weight, but it does come with inherent limitations. Recognizing these limitations is crucial for a comprehensive assessment of one's health status.
Estimate vs. Body Composition
BMI primarily offers an estimate that doesn't account for body composition intricacies. The diversity of body types, along with variations in muscle, bone mass, and fat distribution, demands the integration of additional measurements alongside BMI.
Inaccuracy in Adults

Beyond Excess Weight: BMI doesn't solely measure body fat, making it imprecise for assessing fat levels. Factors like age, sex, muscle mass, activity level, and ethnicity contribute to its accuracy. For instance, an inactive older individual with a healthy BMI might carry excess body fat. On the other hand, a younger person with greater muscle mass could appear healthy despite the same BMI.

Unique Considerations: Musclebound athletes may possess higher BMIs due to muscle weight, which doesn't signify unhealthiness. Variations emerge:
 Older adults usually have more body fat with the same BMI.
 Women tend to carry more body fat than men with similar BMIs.
 Muscular individuals and athletes can exhibit higher BMIs due to substantial muscle mass.
Complexities in Children and Adolescents

Similar Challenges: Challenges evident in adults also impact BMI's effectiveness in children and adolescents. Height and sexual maturation further influence BMI's correlation with body fat in this age group.

Weight Spectrum: BMI's accuracy differs for obese and overweight children. While it generally indicates excess body fat in obese children, it's less precise for overweight children, who could possess heightened fat or fatfree mass.
Final Verdict
While BMI is a reliable measure of body fat for most individuals (9095% of the population), its limitations emphasize the need to complement it with other assessments for a comprehensive evaluation of healthy body weight.
BMI Formula and BMI Prime
Dive into the mechanics of calculating BMI and explore the unique concept of BMI Prime, shedding light on how it offers insights into weight classifications.
BMI Formula at a Glance
Equations for BMI calculation in both the US customary system (USC) and the International System of Units (SI) are outlined below, using the example of a 5'10", 160pound individual:
USC Units: BMI = 703 × mass (lbs) height2 (in) = 703 × 160 702 = 22.96 kg m2
SI, Metric Units: BMI = mass (kg) height2 (m)
72.57 1.782 = 22.90 kg m2
Decoding BMI Prime
BMI prime, a distinct metric, reflects the ratio of a person's BMI to the upper limit considered "normal" by global health institutions like WHO and CDC. When related to BMIupper of 25 kg/m2, the formula is:
BMI prime = BMI 25
The dimensionless nature of BMI prime arises from it being a ratio of two BMI values. By interpreting BMI prime values, classification ranges emerge:
 Underweight: BMI prime less than 0.74
 Normal Weight: BMI prime from 0.74 to 1
 Overweight: BMI prime greater than 1
 Obese: BMI prime surpassing 1.2
The ensuing table presents weight classifications based on BMI prime, contributing to a comprehensive understanding of individual health statuses.
BMI prime enables swift evaluation of the extent to which an individual's BMI deviates from the accepted upper limit of normal BMI. Moreover, it facilitates comparisons between groups with varying upper BMI thresholds, offering valuable insights into body weight assessments.
Ponderal Index
The Ponderal Index (PI) mirrors BMI's approach, gauging a person's leanness or corpulence based on height and weight. The key distinction lies in the formula's use of cubing height instead of squaring it, as seen below. While BMI is valuable for population studies, it lacks precision for individual leanness assessment. Despite similar limitations, PI is more dependable for individuals with extreme heights, mitigating BMI's tendency to yield inaccurate body fat readings for those on the heightweight extremes. Here's the equation for calculating PI using USC, exemplified with a 5'10", 160pound individual:
How toCalculate BMI?
To calculate BMI, divide your weight in kilograms by the square of your height in meters. The formula is: BMI = weight (kg) / (height (m) * height (m)).
What is the BMI of a 5 10 man?
The BMI of a 5'10" (178 cm) man depends on his weight. To calculate, divide his weight in kilograms by (1.78 * 1.78) meters squared.