BMI Calculator
Calculate your Body Mass Index and see your category.
Related Guide
How to Calculate BMI Online
About This Tool
Free BMI calculator online — calculate your Body Mass Index from your height and weight and instantly see your WHO weight category: Underweight (BMI < 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), or Obese (30+). Supports both metric (kg / cm) and imperial (lbs / feet & inches). BMI is the most widely used screening tool for weight assessment in healthcare and public health. Doctors, fitness coaches, and individuals use it to assess weight relative to height and identify potential health risks associated with being underweight or overweight. The tool also shows the healthy weight range for your height so you know your target window.
How to Use
- 1
Select your unit system
Choose Metric (kg, cm) or Imperial (lbs, feet & inches).
- 2
Enter your weight and height
Input your current weight and height.
- 3
Read your BMI
See your BMI score, weight category, and the normal weight range for your height.