Health Tool

BMI Calculator

Calculate your Body Mass Index (BMI) and find out your weight status. Age-adjusted interpretation for adults and children.

Using the BMI Calculator

The Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, overweight, and obesity in adults. It is defined as the weight in kilograms divided by the square of the height in metres (kg/m²).

How it Works

Select your preferred unit system (Metric or Imperial).

Enter your weight and height accurately.

Review your BMI score and where it falls on the WHO classification scale.

Check the healthy weight range provided for your height.

Technical Formula


                        BMI = weight (kg) / [height (m)]²

For imperial units, the formula is: BMI = 703 × weight (lbs) / [height (in)]²

Frequently Asked Questions

What is a healthy BMI?

According to WHO, 18.5-24.9 is normal weight. Under 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese.

Is BMI accurate?

BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass or fat distribution.

Age (years)

Gender

Height (cm)

Weight (kg)

BMI Classification Table (WHO)

BMI Range	Category	Health Risk
< 16.0	Severe Thinness	Very High
16.0 – 16.9	Moderate Thinness	High
17.0 – 18.4	Mild Thinness	Moderate
18.5 – 24.9	Normal Weight	Low
25.0 – 29.9	Overweight	Increased
30.0 – 34.9	Obese Class I	High
35.0 – 39.9	Obese Class II	Very High
≥ 40.0	Obese Class III	Extremely High

Source: World Health Organization (WHO). BMI is a screening tool, not a diagnostic measure. Consult a healthcare professional for medical advice.