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BMI Calculator

Use this BMI calculator to estimate your Body Mass Index from weight and height. The result helps show whether your BMI falls into a standard category such as underweight, normal weight, overweight or obese. It is useful for general health awareness, but it should not be treated as a full medical assessment.

Weight category estimate Metric inputs Fast result General health check

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Example: weight 70 kg and height 170 cm.

Summary

BMI Value—
Category—
Height in Meters—

Formula used: BMI = Weight (kg) ÷ Height (m²)

What Is BMI?

BMI, or Body Mass Index, is a number calculated from your height and weight. It is commonly used as a quick screening method to estimate whether body weight is within a standard range for adults.

BMI does not directly measure body fat, fitness level or overall health. Instead, it provides a simple starting point that can help people understand whether their body weight may fall below, within or above a commonly used range.

How to Use This BMI Calculator

  1. Enter your weight in kilograms.
  2. Enter your height in centimeters.
  3. Click Calculate BMI to view your BMI and category.
  4. Review the result as a general indicator, not a medical diagnosis.

This is useful for quick checks, routine tracking and general awareness when you want a simple metric based on height and weight.

Example of BMI Calculation

Suppose your weight is 70 kg and your height is 170 cm.

Height in meters = 170 ÷ 100 = 1.70 m
BMI = 70 ÷ (1.70 × 1.70) = 24.2

A BMI of 24.2 usually falls in the normal weight range under standard adult BMI categories.

BMI Categories

These categories are commonly used for general adult screening. Interpretation can vary depending on age, body composition, ethnicity and medical context.

When BMI Is Useful and When It Is Limited

BMI is useful as a quick health screening reference, especially for broad weight-category estimates. It can help users decide whether they may need to review diet, activity, lifestyle or professional guidance.

However, BMI has important limitations. It does not distinguish between fat and muscle, and it may be less useful for athletes, children, older adults, pregnant individuals, or people with unusual body composition. That is why BMI should be treated as a general indicator rather than a complete health assessment.

Who Can Use This BMI Calculator?

Adults who want a quick body mass index estimate can use this tool for general awareness and routine tracking. It may also be helpful for students, fitness users, health educators and anyone comparing simple height-to-weight relationships.

For medical advice, diagnosis or treatment decisions, speak with a qualified healthcare professional instead of relying on BMI alone.

Frequently Asked Questions

What is BMI?
BMI, or Body Mass Index, is a number calculated from weight and height to estimate whether body weight falls into a standard category.
How is BMI calculated?
BMI is calculated by dividing weight in kilograms by height in meters squared.
Are BMI results exact for health diagnosis?
No. BMI is a general screening tool and does not directly measure body fat, muscle mass or overall health.
Who can use this BMI calculator?
Adults can use it for a quick BMI estimate, but it may be less useful for athletes, children, older adults or people with unusual body composition.
Does this tool store my data?
No. The calculation runs in your browser and does not require signup.

Disclaimer: This calculator is provided for informational and educational use only. It does not replace medical advice, diagnosis or treatment.