BMI Calculator
BMI Calculator
Calculate your Body Mass Index (BMI) and find out whether your weight is in a healthy range.
BMI Calculator
Body Mass Index (BMI) is one of the most commonly used methods for estimating whether a person's weight is appropriate for their height. It provides a quick indication of whether someone falls into the categories of underweight, normal weight, overweight, or obesity.
Our free BMI Calculator allows you to calculate your Body Mass Index instantly using either the Metric or Imperial measurement system.
The calculator is suitable for adults and provides results based on internationally accepted BMI classification guidelines.
How to Use the BMI Calculator
Using our BMI Calculator is simple:
- Select your preferred measurement system (Metric or Imperial).
- Enter your height.
- Enter your weight.
- Click Calculate BMI.
- View your BMI score and health category instantly.
The calculator also displays your recommended healthy weight range based on your height.
BMI Formula
Metric Formula
BMI = Weight (kg) ÷ Height² (m)Imperial Formula
BMI = (Weight (lb) × 703) ÷ Height² (in)BMI Categories
| BMI | Classification |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Normal Weight |
| 25.0 – 29.9 | Overweight |
| 30.0 and above | Obesity |
These categories are based on recommendations from the World Health Organization (WHO).
Why BMI Matters
Body Mass Index is often used by healthcare professionals as a screening tool to identify possible weight-related health risks.
People with a BMI outside the normal range may have a higher risk of developing conditions such as:
- Heart disease
- High blood pressure
- Type 2 diabetes
- Sleep apnea
- Stroke
- Joint problems
However, BMI should not be considered a perfect measurement because it does not distinguish between muscle mass and body fat.
Limitations of BMI
While BMI is useful for most adults, it has some limitations.
BMI may not accurately represent:
- Athletes with high muscle mass
- Pregnant women
- Older adults
- Children and teenagers
- Individuals with unusual body composition
For a more complete health assessment, BMI should be used together with other measurements such as body fat percentage and waist circumference.
Frequently Asked Questions
What is a healthy BMI?
A BMI between 18.5 and 24.9 is generally considered healthy for most adults.
Can BMI calculate body fat?
No.
BMI estimates weight relative to height but does not directly measure body fat.
Is BMI accurate?
BMI provides a good general estimate for most adults but should not replace professional medical advice.
Should athletes use BMI?
Athletes often have higher muscle mass, which may result in a higher BMI even when body fat is low.
Is this BMI Calculator free?
Yes.
Our BMI Calculator is completely free and works on desktop, tablet, and mobile devices.
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