BMI Calculator
Calculate your Body Mass Index (BMI) to determine if you have a healthy body weight based on your height and weight.
Calculate Your BMI
Your BMI Results
Healthy Weight Range
< 18.5
18.5 - 24.9
25 - 29.9
30+
About BMI
Body Mass Index (BMI) is a person's weight in kilograms divided by the square of height in meters. BMI is an inexpensive and easy screening method for weight category—underweight, healthy weight, overweight, and obesity.
BMI does not measure body fat directly, but it is moderately correlated with more direct measures of body fat. It is used as a screening tool to identify potential weight problems in adults.
**BMI Calculator**
Calculate your Body Mass Index (BMI) to assess weight status based on height and weight.
**Key Features:**
– Metric and US unit options
– Age and gender inputs
– BMI calculation with classification
– Healthy weight range
– BMI Prime and Ponderal Index
**BMI Categories (Adults):**
– **Underweight:** <18.5
– Severe Thinness: <16
– Moderate Thinness: 16-17
– Mild Thinness: 17-18.5
– **Normal weight:** 18.5-25
– **Overweight:** 25-30
– **Obese:** >30
– Class I: 30-35
– Class II: 35-40
– Class III: >40
**BMI Formula:**
– **Metric:** BMI = weight (kg) / height² (m)
– **US Units:** BMI = 703 × weight (lbs) / height² (in)
**Additional Calculations:**
– **BMI Prime:** BMI / 25 (≥1 indicates overweight)
– **Ponderal Index:** weight / height³ (better for extreme heights)
**Health Risks:**
– **Overweight:** High blood pressure, diabetes, heart disease, stroke, certain cancers
– **Underweight:** Malnutrition, osteoporosis, immune deficiency, reproductive issues
**Limitations:**
– Doesn’t distinguish between muscle and fat
– Less accurate for athletes (high muscle mass)
– Varies by age, sex, ethnicity
– Doesn’t consider body composition
**Note:** BMI is a screening tool, not a diagnostic measure. Consult healthcare professionals for personalized health assessments.