BMI Calculator

Calculate your Body Mass Index for free and check your healthy weight range. Works in metric and imperial. Private, instant, and runs fully in your browser.

BMI Settings
Your BMI Result
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Your BMI result will appear here
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Health & Fitness

BMI Calculator

Calculate your Body Mass Index (BMI) based on weight, height, age, and gender, and view your weight category breakdown.

WHO Compliant
STEP 01

Enter Height

Specify your height in centimeters or feet/inches using the unit switcher.

STEP 02

Enter Weight

Enter your current weight in kilograms or pounds depending on your unit preference.

STEP 03

Age & Gender

Input your age and biological gender to get precise reference indicators.

STEP 04

See Health Status

View your calculated BMI score, health classification, and ideal weight targets.

Your Privacy Matters

All processing stays in your browser

No Server Uploads

Files never leave your device

Auto-Cleared

Data removed when you close

Capabilities

Healthy Weight Screening

Clinical indicators

WHO Standards Compliant

Categorizes your BMI (underweight, normal, overweight, obese) using official WHO guidelines.

Metric & Imperial Switch

Switch between kilograms/centimeters and pounds/feet-inches in a single click.

Children & Teen Support

Computes proper growth-chart percentiles for children and teenagers under 20 years old.

Ideal Weight Range

Calculates the healthy target weight boundaries matching your exact height characteristics.

Secure, Anonymous Processing

Your height, weight, and fitness parameters remain private and process solely inside your browser. No details are collected or uploaded to databases.

Support

Common Questions Answered

Quick help
Q1 What is a normal Body Mass Index (BMI) range?
According to World Health Organization (WHO) guidelines, a normal adult BMI range is between 18.5 and 24.9. Lower values fall under underweight, and higher numbers represent overweight or obesity.
Q2 Is BMI a perfect indicator of overall weight health?
BMI is a general screening index. It does not measure body fat directly and doesn't differentiate between muscle mass, bone density, and body fat (e.g., bodybuilders may have high BMIs despite low body fat).
Q3 Are the BMI interpretations different for children and teenagers?
Yes. For kids and teens (ages 2-19), BMI is interpreted using age-and-gender-specific growth percentiles (e.g. CDC charts) because body composition changes rapidly during growth.
Q4 How is BMI mathematically calculated?
BMI is calculated by dividing weight in kilograms by the square of height in meters (kg/m²). For imperial measurements, the equation divides weight in pounds by the square of height in inches, multiplied by a scaling factor of 703.
Q5 Do you log or store my health parameters?
No. All computations occur client-side in your local browser sandbox. Your weight and height metrics are discarded immediately when you close the tab or reload.