The Body Mass Index (BMI) Calculator can be used to calculate BMI value and corresponding weight status while taking age into consideration. Use the 'Metric Units' tab for the International System of Units or the 'Other Units' tab to convert units into either US or metric units. Note that the calculator also computes the Ponderal Index in addition to BMI, both of which are discussed below in detail.
• Choose your measurement system: US Units (feet, inches, pounds), Metric Units (centimeters, kilograms), or Other Units (stone, pounds).
• Enter your Age (2 - 120) and select your biological Gender. For children & teens (ages 2–19), BMI percentiles are also evaluated.
• Click Calculate BMI to generate your BMI value, clinical status category, color-coded radial speedometer, ideal healthy weight range, BMI Prime, and Ponderal Index.
Equivalent: 177.8 cm (1.78 m)
Equivalent: 72.6 kg (11 st 6.0 lbs)
A BMI of 23.0 kg/m² indicates that you are at a healthy weight for your height. Maintaining this range is associated with lower cardiovascular and metabolic risks.
Your body weight is within the healthy BMI range for your height.
The World Health Organization (WHO) defines Body Mass Index (BMI) as a simple index of weight-for-height that is commonly used to classify underweight, normal weight, overweight, and obesity in adult populations (aged 20 and older).
| BMI Range (kg/m²) | WHO Classification | BMI Prime | Health Risk Profile |
|---|---|---|---|
| < 16.0 | Severe Thinness | < 0.64 | High risk of undernutrition and immune suppression |
| 16.0 – 16.9 | Moderate Thinness | 0.64 – 0.67 | Moderate nutritional deficiency risk |
| 17.0 – 18.4 | Mild Thinness | 0.68 – 0.73 | Mild risk of low bone density and nutrient depletion |
| 18.5 – 24.9 | Normal (Healthy Weight) | 0.74 – 0.99 | Lowest risk of cardiovascular and metabolic illness |
| 25.0 – 29.9 | Overweight (Pre-obese) | 1.00 – 1.19 | Increased risk of hypertension and type 2 diabetes |
| 30.0 – 34.9 | Obese Class I (Moderate) | 1.20 – 1.39 | High risk of cardiovascular disease and sleep apnea |
| 35.0 – 39.9 | Obese Class II (Severe) | 1.40 – 1.59 | Very high risk of joint, vascular, and metabolic comorbidities |
| ≥ 40.0 | Obese Class III (Morbid) | ≥ 1.60 | Extremely high risk; clinical supervision recommended |
BMI = Weight (kg) / [Height (m)]²BMI = 703 × Weight (lbs) / [Height (in)]²