What is a normal BMI range according to WHO?

According to the World Health Organization (WHO): Underweight is below 18.5, Normal/Healthy is 18.5 to 24.9, Overweight is 25.0 to 29.9, and Obese is 30.0 or greater.

Does the BMI formula change with age?

Standard adult BMI thresholds apply to ages 20 and up. For children and teenagers aged 2 to 19, BMI percentiles relative to age and sex charts are used instead.

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BMI Calculator Online Free (By Age & Gender)

Calculate your Body Mass Index (BMI), healthy weight range, and WHO category classifications online for free by age, gender, and height.

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Execution Mode

100% Client-Side In-Browser

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Zero Persistent Storage

Access Policy

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Informational Disclaimer: This calculator provides mathematical estimates for educational and informational purposes only. It should not be considered professional financial, medical, nutritional, legal, or investment advice.

Height (cm)

Weight (kg)

How to Use BMI Calculator Online Free (By Age & Gender)

1
Select metric (kg/cm) or imperial (lbs/inches) unit system.
2
Enter your weight, height, age, and gender.
3
Click 'Calculate BMI' to review your index and healthy range.

Key Features

Metric (kg/cm) and Imperial (lbs/inches) units
WHO BMI category classification gauge
Ideal weight target range estimation
Gender & age awareness

Benefits

Understand body mass metrics quickly
Track fitness, wellness, and healthy lifestyle targets
Instant calculations with zero account signup

Common Pitfalls to Avoid

• Confusing height in inches with total feet.
• Using adult BMI cutoffs for children under 18.

Data Handling & Privacy Notice

This utility executes entirely client-side in your web browser. No text, calculations, or uploaded data are sent to our servers or stored in any database.

Frequently Asked Questions

The standard mathematical formula (weight divided by height squared) is the same for adult men and women. However, women naturally carry higher body fat percentages than men at identical BMI values.