BMI Calculator
Free Online Body Mass Index Tool
The BMI Calculator is a free online tool that helps you quickly check your Body Mass Index to know whether you are underweight, normal, overweight, or obese. By entering your height and weight, you can instantly find out your BMI score and understand your health category. This calculator is perfect for anyone who wants to track fitness goals, plan diets, or monitor overall health. Although BMI is a useful guideline, it should be combined with other tools like a BMR Calculator or Body Fat Percentage Calculator for a more complete picture of your health.
Calculate your BMI
Enter your details below and click Calculate.
Tip: Enter height in feet as a decimal (e.g., 5.7 ≈ 5 ft 8 in). This calculator converts feet to meters automatically.
BMI Categories
| BMI Range | Category | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Nutritional deficiencies, low immunity |
| 18.5 – 24.9 | Normal & Healthy | Lowest risk |
| 25 – 29.9 | Overweight | Increased risk of diabetes & heart disease |
| 30 and above | Obese | High risk of chronic illnesses |
Example BMI Values
- BMI 18.4 → Underweight
- BMI 22.0 → Normal & Healthy
- BMI 27.5 → Overweight
- BMI 32.0 → Obese.
Quick FAQs
Is BMI always accurate?
Not always. BMI does not distinguish between muscle and fat. Athletes may have a high BMI due to muscle mass. Use BMI as a guideline and consider body-fat measurements for a fuller picture.
What is a healthy BMI range?
For most adults, a BMI between 18.5 and 24.9 is considered healthy.
When should I consult a doctor?
If your BMI is outside the healthy range or you have health concerns or symptoms, consult a healthcare professional for a full assessment.