How is the BMI score calculated?

The standard formula for BMI is weight in kilograms divided by height in meters squared (BMI = kg/m²). If you enter measurements in imperial units, the formula is (weight in pounds / height in inches squared) * 703.

Is BMI accurate for muscular athletes?

No, BMI does not directly measure body fat or muscle mass. Because muscle tissue is much denser than fat, highly active individuals, bodybuilders, or athletes may receive an 'overweight' classification even though they have an extremely low body fat percentage.

What are the standard BMI categories?

According to the World Health Organization (WHO), the categories are: Under 18.5 is Underweight, 18.5 to 24.9 is Normal Weight, 25.0 to 29.9 is Overweight, and 30.0 or higher is Obese.

Health

BMI Calculator

Calculate your Body Mass Index instantly and understand your weight category, healthy range, and next-step guidance.

Inputs

Enter your body measurements

Choose height and weight units independently for faster entry.

Height

Example: 170 cm

Unit

Weight

Example: 65 kg

Unit

Summary

Your BMI is 22.49 (Normal).

Results update instantly as you type.

BMI scale

▲

UnderweightNormalOverweightObese

BMI Score

22.49

Calculated from height and weight

BMI Category

Normal

WHO classification

Healthy weight range

53.5 - 72.0 kg

Based on BMI 18.5 to 24.9

Difference from ideal

Within range

Maintain current range

Category insight

Normal

Underweight • Normal • Overweight • Obese

Healthy BMI band

18.5 to 24.9

General adult reference range

Action guidance

Maintain current routine

General fitness reference, not medical advice

Accuracy note

BMI is a general screening metric based on weight and height. It does not directly measure body fat percentage, age, or muscle mass.

Runs in browser. Data stays on your device.

Understanding Body Mass Index (BMI) & Ideal Weight Ranges

Body Mass Index (BMI) is a standardized statistical measurement used globally to categorize human body mass based on height and weight. It acts as an easy-to-use screening tool to indicate whether an individual falls under underweight, normal weight, overweight, or obese ranges, helping you assess general physical wellness.

Maintaining a body weight in the healthy BMI range is linked to lower risks of cardiovascular disease, type 2 diabetes, hypertension, and other chronic health conditions. Although BMI is a helpful starting point, it should be paired with other measurements like body fat percentage and waist circumference for a complete health evaluation.

How to Use the Tool

Select your preferred measurement units (Metric: cm/kg or Imperial: ft/in/lbs).
Enter your accurate height and current body weight in the input fields.
Read your calculated BMI score, classification, and healthy weight range immediately.
Export the generated report as a text file or copy the breakdown to your clipboard.