BMI Calculator

Check body mass index from height and weight using the standard adult BMI formula and WHO-style categories.

Interactive calculator

Check Your Body Mass Index (BMI)

Verify adult BMI (supporting standard or ethnic Asian parameters) or pediatric growth percentiles for children and teens.

Height (cm)Metric height value

Weight (kg)Current body mass

Asian Cutoffs OptionApply WHO criteria adjusting cutoff bounds (overweight > 23, obese > 27.5) for South/East Asian populations.

Results

BMI Value

23.5

Weight Category

Normal Weight

Healthy Weight Range

53.5 kg - 72 kg

Personalized Assessment

What does my BMI mean?

Congratulations! Your BMI is in the healthy range. Maintaining a healthy weight decreases the risk of metabolic issues, heart strains, and vascular blockages.

How to use it

01Enter your height in centimeters and weight in kilograms.
02The calculator converts height to meters automatically and computes BMI.
03Review the category label to see where the result sits on the standard scale.

Result guide

BMI below 18.5 is typically classified as underweight.
BMI from 18.5 to 24.9 is commonly treated as the normal range.
Higher ranges may indicate overweight or obesity and should be interpreted with context.

About this calculator

BMI is a quick screening metric used to compare body weight with height. It is widely understood, easy to calculate, and useful for broad health conversations.

It is still only one input. BMI does not directly measure muscle mass, body composition, or medical history, so it works best as a first check rather than a full diagnosis.

Frequently asked questions

What is BMI and what does it measure?

Body Mass Index (BMI) is a simple mathematical ratio used to estimate general body fat categories by comparing an individual's weight against their height. The metric is calculated by dividing weight in kilograms by the square of height in meters (BMI = kg / m^2). For instance, an adult weighing 75 kg with a height of 1.75 meters (175 cm) has a computed BMI of 24.49, which falls within the healthy category. [Formula: BMI = weight (kg) / [height (m)]^2 | Source: World Health Organization (WHO)]

What is a healthy BMI range for adults?

According to international health standards, a healthy and normal BMI range for adults aged 20 and older is between 18.5 and 24.9. A BMI below 18.5 is categorized as underweight, a BMI from 25.0 to 29.9 is classified as overweight, and a BMI of 30.0 or higher is defined as obese. For example, a person who is 1.8 meters tall (180 cm) should ideally maintain a body weight between 60 kg and 80.6 kg to stay within the healthy BMI range. [Formula: Weight Range = Healthy BMI * [height (m)]^2 | Source: World Health Organization (WHO) Guidelines]

Is BMI the same for men and women?

The mathematical formula to calculate BMI is identical for both men and women and does not change based on sex. However, the interpretation of BMI in terms of health risks can differ because women naturally tend to carry a higher body fat percentage than men at the same BMI value. For example, a man and a woman who both have a BMI of 23.5 are both classified as normal weight, but their body composition can be significantly different. [Formula: BMI = weight (kg) / [height (m)]^2 | Source: National Institutes of Health (NIH)]

Does BMI account for muscle mass?

No, the standard BMI formula does not differentiate between fat tissue, lean muscle mass, bone density, and water weight. Because muscle is denser than fat, highly muscular individuals, such as bodybuilders or athletes, can have a high BMI of 26 or more (classifying them as overweight) even though they have a low body fat percentage and are in excellent physical condition. [Formula: BMI = weight (kg) / [height (m)]^2 | Source: American College of Sports Medicine (ACSM)]

What are the BMI categories per WHO classification?

The World Health Organization (WHO) establishes four major weight categories based on adult BMI values: Underweight (BMI less than 18.5), Normal Weight (BMI 18.5 to 24.9), Overweight (BMI 25.0 to 29.9), and Obese (BMI 30.0 or higher). Obesity is further split into Class I (30.0 to 34.9), Class II (35.0 to 39.9), and Class III (40.0 or greater). For example, a BMI of 32.5 is classified as Class I Obesity. [Formula: WHO BMI Classification Table | Source: World Health Organization (WHO)]

Per WHO guidelines / Peer-reviewed researchFormula version: 2026

Reviewed by Dr. Elena Rostova, MD, PhD

Medical Doctor & Clinical Nutrition Researcher

Reviews health index calculators, unit converter benchmarks, and mathematical models against WHO guidelines and peer-reviewed research.

Formula last verified: June 2026

Sources: Per WHO guidelines / Peer-reviewed research/WHO BMI classification guidance/Published TDEE and basal metabolic rate formula references

Disclaimer: Calculator results are for general reference and educational purposes only per WHO standards. Health indexes and mathematical models are not a substitute for professional medical diagnosis, clinical nutrition, or certified trade advice.

Read our Editorial & Verification Policy →

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