BMI Calculator
Calculate your Body Mass Index (BMI) to know if you are at a healthy weight
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About BMI
What is BMI?
BMI, or Body Mass Index, is a measurement that assesses your body weight relative to your height. The BMI measurement can be used for any age, from babies and children to teens and adults. Such a measurement, which classifies individuals as underweight, normal weight or overweight, can be used to determine if someone is an inappropriate or unhealthy weight for their current size. BMI calculators can be ideally incorporated for men and women alike when setting fitness goals.
How to Calculate BMI
To calculate BMI, a body mass index calculator can be used. Our free, online BMI calculator utilizes a scientifically recognized formula to yield easy-to-read results. The metric formula we use to calculate BMI is: m/l². Here, we take your current body weight in kilograms and divide it by the square of your height in meters. Our calculator also incorporates your age and sex for more accurate results. m/l².
Factors Influencing BMI
Age and gender play a significant role in yielding appropriate BMI values. Since men tend to have a higher muscle percentage than women, the BMI for men is generally higher than for women. Healthy BMI values are also significantly higher for older individuals compared to younger ones. Other factors include daily activity, body type, and muscle versus fat composition.
Interpreting BMI
Classifying BMI Correctly
Based on your sex, age and other variable factors, your BMI is classified as either underweight, normal weight, overweight or obese. According to the World Health Organization, the healthy adult BMI range is classified as 18.5–24.9. 18.5–24.9.
< 18.5
Underweight
18.5 – 24.9
Healthy weight
25 – 29.9
Overweight
≥ 30
Obese
Consequences of High or Low BMI
High BMI Risks:
- • Increased risk of diabetes
- • High blood pressure and hypertension
- • Higher risk of heart attack or stroke
- • Hormonal imbalances
Low BMI Risks:
- • Lack of essential nutrients
- • Development of osteoporosis
- • Weakened immune system
- • Difficulty healing wounds
Criticism of BMI
Is BMI Still Relevant?
Criticism of BMI calculators is increasingly present. Such criticism stems from the fundamental question of whether a simple BMI value higher than 24 can immediately indicate potential medical problems. Critics want to focus more on the complete composition of an individual's weight. This is especially relevant for athletes, where higher weight resulting from increased muscle mass does not indicate health problems.
Research Considerations
Studies distinguish between belly fat and lower body fat. While fat on thighs, buttocks or arms is relatively safe, fat around the abdomen can increase the risk of cardiovascular disease and stroke. BMI should be used as one screening tool for understanding overall health, while also taking into account personal wellness needs.