BMI Calculator
Calculate your Body Mass Index and see your weight category with healthy ranges.
< 18.5
18.5 – 24.9
25 – 29.9
30 – 34.9
≥ 35
Online BMI calculator
Calculate your Body Mass Index (BMI) in seconds, in metric or imperial units. Find your weight category according to the WHO classification and the healthy range for your height.
What is BMI?
BMI is calculated by dividing weight in kilograms by height in meters squared (kg/m²). It is a simple indicator to classify weight in adults, although it does not distinguish muscle mass from fat.
How BMI is calculated
BMI is calculated by dividing weight in kilograms by height in meters squared (BMI = weight ÷ height²). For example, a 70 kg person at 1.75 m has a BMI of 22.9 (70 ÷ 3.06). This tool does the math automatically and accepts metric and imperial units.
- Choose the unit system: metric or imperial.
- Enter your weight and height.
- Read your BMI, your weight category and the healthy range for your height.
WHO BMI categories
- Underweight: below 18.5.
- Normal: 18.5 to 24.9.
- Overweight: 25 to 29.9.
- Obesity: 30 or above.
Frequently Asked Questions
What does my BMI result mean?
BMI classifies your weight according to WHO: underweight (below 18.5), normal (18.5–24.9), overweight (25–29.9) and obesity (30+).
Is BMI accurate for athletes or very muscular people?
It does not distinguish muscle mass from fat, so it can overestimate BMI for very muscular people. It is a reference indicator.
What is the healthy weight range for my height?
The calculator shows the weight range in kilos corresponding to a BMI of 18.5 to 24.9 for your height.
Can I use pounds and feet?
Yes, imperial mode lets you enter weight in pounds and height in feet and inches.