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BMI Calculator

Calculate your Body Mass Index and healthy weight range

Last Updated: July 2026
Your weight in kilograms
Your height in centimeters
BMI
—
Body Mass Index
Category
—
Weight category
Healthy Weight Range
—
For your height

BMI Analysis

ComponentValue

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What Is a BMI Calculator?

A BMI Calculator computes your Body Mass Index based on your weight and height. It categorizes your BMI as underweight, normal, overweight, or obese, and shows the healthy weight range for your height.

BMI is a widely used screening tool for weight categories. While it has limitations (does not distinguish muscle from fat), it provides a quick assessment of whether your weight is in a healthy range for your height.

BMI Formula

BMI = Weight (kg) / Height² (m²)
Healthy Range: 18.5 - 24.9
Underweight: < 18.5 | Overweight: 25 - 29.9 | Obese: ≥ 30
Weight = In kilogramsHeight = In meters squaredBMI = Body Mass Index

Frequently Asked Questions

What is BMI?
BMI (Body Mass Index) is a measure of body fat based on weight and height. It is calculated as weight (kg) divided by height squared (m²). BMI is a screening tool, not a diagnostic measure.
What are the BMI categories?
Underweight: < 18.5. Normal weight: 18.5 - 24.9. Overweight: 25 - 29.9. Obese: ≥ 30. These ranges are based on WHO guidelines for adults.
Is BMI accurate?
BMI is a useful screening tool but has limitations. It does not distinguish between muscle and fat mass. Athletes may have high BMI due to muscle. It is less accurate for elderly, pregnant women, and children. Consider other measures like waist circumference.
What is a healthy BMI range?
The healthy BMI range is 18.5 to 24.9 for adults. This range is associated with the lowest risk of health problems. However, optimal BMI may vary by age, gender, and ethnicity.
How to calculate BMI manually?
BMI = Weight (kg) / Height² (m²). For example, 70 kg and 1.7 m: BMI = 70 / (1.7 × 1.7) = 70 / 2.89 = 24.2. This falls in the normal weight range.

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