Calculator

BMI Calculator

BMI Calculator helps you complete calculations quickly with instant results in your browser. No upload is required and your data stays on your device.

Weight (kg)Height (cm)

BMI: 22.9 (Normal)

This tool runs entirely in your browser. Your files and text are never uploaded to our servers.

Live comparison

Adult mean BMI worldwide is about 26.5. Compare your result with regional averages below.

Your region (estimated)United StatesRegional average: 29.0

Global mean BMI26.5Global obesity rate (BMI ≥30): 16.4%

Regional estimates are based on WHO/NCD-RisC pooled data for adults. Region is inferred from your locale and timezone—not GPS. For medical advice, consult a healthcare professional.

Compare regional averages

Region	Mean BMI	Obesity %
United States	29.0	36.2%
Mexico	28.9	32.4%
United Kingdom	27.4	27.8%
Australia	27.4	29.0%
South Africa	27.0	20.3%
Canada	27.0	27.7%
Brazil	26.8	22.1%
Spain	26.7	23.8%
Germany	26.3	22.3%
France	25.5	17.0%
China	23.9	6.2%
Nigeria	23.8	8.9%
South Korea	23.7	7.7%
Indonesia	23.3	6.9%
Japan	22.6	4.3%
India	22.1	3.9%

Your input is processed locally in the browser under normal use.

How to use

Open BMI Calculator and enter or paste your input.
Adjust options to match your scenario.
Copy the result and continue your work.

FAQ

How do I use BMI Calculator?

Enter your input above, review the live result, then copy or reuse the output in your workflow.

Is BMI Calculator safe for sensitive data?

Yes. Processing runs in your browser whenever possible, so content is not sent to a remote server in normal use.

About this tool

Body Mass Index (BMI) is a screening measure that relates body weight to height. It helps estimate whether an adult falls into underweight, normal, overweight, or obese ranges used in public-health reporting. This calculator uses the standard metric formula and compares your result with published regional averages.

Key metrics explained

BMI (Body Mass Index)

Weight in kilograms divided by height in meters squared: BMI = kg / m².

BMI was introduced in the 19th century by Adolphe Quetelet as a population-level indicator. WHO classifies adult BMI as underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

Obesity rate

The percentage of adults with BMI ≥ 30 in a country or region.

Obesity rates have risen globally since 1975. High-income countries tend to show higher averages, while many East and South Asian populations have lower means but rising trends.

Related concepts

BMI limitations

BMI does not distinguish muscle from fat mass and may misclassify athletes or older adults. Waist circumference, body composition, and clinical assessment provide additional context.

Why regional comparison matters

Average BMI varies by genetics, diet, urbanization, and healthcare access. Comparing your value with regional and global means helps interpret results in a population context—not as a diagnosis.

Data & context

Global BMI context