BMI Calculator
Calculate your Body Mass Index from weight and height.
A BMI calculator computes your Body Mass Index from your weight and height and places it into a standard category (underweight, normal, overweight, obese).
How to Use the BMI Calculator
- Enter your weight. Type your weight in kilograms.
- Enter your height. Type your height in centimeters.
- Read your BMI. See your BMI value and category.
This tool processes your input locally in your browser. Nothing is uploaded.
What Is BMI Calculator?
BMI (Body Mass Index) is a simple measure of body size based on weight and height, used to screen for weight categories.
How BMI is calculated
BMI = weight (kg) / height (m)². Standard categories: under 18.5 is underweight, 18.5–24.9 normal, 25–29.9 overweight, and 30+ obese.
Limitations
BMI does not distinguish muscle from fat, so very muscular people may be classified as overweight. It is a screening tool, not a direct measure of health.
Key Features
- Accurate BMI formula
- Standard categories
- Instant results
Examples
- 70 kg at 175 cm → BMI ≈ 22.9 (normal).
Common Use Cases
- Health screening
- Fitness tracking
- Weight goals
Tips & Best Practices
- Interpret BMI alongside other health indicators, not in isolation.
Limitations
- BMI can misclassify athletes and older adults.
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Frequently Asked Questions
What is BMI?
Body Mass Index, a measure of body size based on weight and height.
How is BMI calculated?
Weight in kg divided by height in meters squared.
What are healthy BMI ranges?
18.5–24.9 is considered normal.
Is BMI always accurate?
No, it does not distinguish muscle from fat.
Is it free?
Yes, and it runs locally.