BMI Calculator

Enter your height and weight to calculate BMI and see whether you fall into underweight, normal, overweight, or obese categories.

Height (cm)

Weight (kg)

Key Takeaways & Quick Facts

Primary Purpose

Calculate Body Mass Index and check your weight category.

Execution Environment

100% Client-Side In-Browser (Zero Cloud Uploads)

Standard Verification

Calculations tested against standard benchmarks

How to Use BMI Calculator

Select "Metric" or "Imperial" measurement system.
Enter your height and weight in the appropriate fields.
Click "Calculate BMI" to see your result.
View your BMI value, category, and healthy weight range.
Use "Reset" to clear all fields.

How it Works

BMI (Body Mass Index) is calculated by dividing your weight in kilograms by the square of your height in metres. It provides a quick screening measure to categorise weight status. The standard WHO categories are: Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (30 and above).

BMI = weight (kg) ÷ height (m)²

Examples

Input: Height: 175 cm, Weight: 70 kg

Result: BMI = 22.86 (Normal weight)

Input: Height: 5'10", Weight: 154 lbs

Result: BMI = 22.09 (Normal weight)

Input: Height: 160 cm, Weight: 90 kg

Result: BMI = 35.16 (Obese Class I)

Frequently Asked Questions

Is BMI an accurate measure of health?

BMI is a useful screening tool but has limitations. It does not distinguish between muscle mass and fat, nor does it account for body composition, age, sex, or ethnicity. A healthcare professional can provide a more comprehensive assessment.

What is a healthy BMI range?

For adults, a BMI between 18.5 and 24.9 is generally considered normal weight by the World Health Organization. However, individual health depends on many factors beyond BMI.

Does BMI apply to children and teenagers?

This calculator uses the standard adult BMI formula and categories. BMI for children and teens is interpreted differently using age- and sex-specific percentiles. Consult a paediatrician for children's BMI assessment.

Note: BMI is a screening measure and should not be used as a medical diagnosis. It does not account for muscle mass, bone density, age, sex, or ethnicity. Always consult a healthcare professional for medical advice.

Formula Audited & Client-Side Private

Calculations are verified against standard mathematical and banking benchmarks. Data stays on your device in local memory.

Our Verification Standards →