What is a Healthy Weight?

The range of healthy body weights is calculated based on BMI (Body Mass Index). Given a specific height, the calculator uses standard algorithms to calculate the range of possible body weights that fall within different categories of weight determined by BMI. An adult aged 18 or older with a BMI between 18.5 and 25 kg/m² is typically defined as having a healthy or normal weight.

Effects of Being Underweight, Overweight, and Obese

Underweight (BMI < 18.5):

A person can be underweight as a result of genetics, lack of food, metabolic issues, use of drugs, or illness. Being underweight is associated with medical conditions that include hyperthyroidism, cancer, or tuberculosis, and can be indicative of some underlying disease or disorder. Being underweight can also cause low energy levels, osteoporosis, and a weak immune system.

Overweight (BMI 25-30):

Being overweight is typically a result of consuming more calories than the body expends through metabolic processes and exercise. Being overweight can cause similar issues as obesity but to a lesser extent, including increased risk of diabetes, heart disease, and several forms of cancer.

Obese (BMI > 30):

Obesity greatly increases the risk of cardiovascular diseases such as heart disease and stroke as well as hypertension, type 2 diabetes, musculoskeletal disorders including osteoarthritis, and some cancers. It can also cause obstructive sleep apnea and depression.

Maintaining a Healthy Weight

Managing weight involves addressing many underlying issues, including diet, exercise, and possible mental health disorders. The WHO recommends:

• Limiting intake of calorie-dense foods, total fats, and sugars
• Increasing consumption of fruits, vegetables, legumes, whole grains, and nuts
• Engaging in regular physical activity (150 minutes per week for adults)
• Making sustainable lifestyle changes rather than quick fixes

Note: This calculator is most accurate for adults aged 18 or older. BMI does not account for factors such as body composition, muscle mass, bone density, age, sex, and ethnicity. While accurate for an "average" person, it is possible to be categorized as overweight or underweight and still be "healthy," but this requires more than a generalized calculation to determine – likely with the help of a medical professional.