BMI Calculator Online Men & Women

Calculate your Body Mass Index and learn more about your health

Add Waist Measurement for Waist-to-Height Ratio
--
Enter your details
Please enter your height and weight to calculate your BMI.
Healthy Weight Range: --
Waist-to-Height Ratio: -- - --
Underweight
18.5
Normal
25
30
Obese
Learn more about what your BMI means

Body Mass Index (BMI) is a measure of body fat based on your weight in relation to your height. It applies to adult men and women.

BMI Categories:

  • Underweight: BMI less than 18.5
  • Normal weight: BMI 18.5 to 24.9
  • Overweight: BMI 25 to 29.9
  • Obese: BMI 30 or greater

Limitations: BMI doesn't account for muscle mass, bone density, overall body composition, and racial and sex differences. For example, athletes might have a high BMI due to increased muscle mass rather than increased body fat.

Waist-to-Height Ratio is a simple screening tool that can indicate central obesity. A healthy ratio is generally considered to be 0.5 or less, meaning your waist circumference should be less than half your height.

This calculator provides general information only. It is not a substitute for professional medical advice. Please consult a healthcare provider for personalized health guidance.

How to use BMI Calculator Complete Guide?

What is a BMI Calculator?

A BMI calculator is a simple tool used to estimate whether a person has a healthy body weight for their height. BMI stands for Body Mass Index.

It uses a basic mathematical formula to calculate a value (the BMI) which is then used to categorize a person into a weight range, such as underweight, normal weight, overweight, or obese.

How to Calculate BMI?

The Body Mass Index is a quick and simple screening tool that relates your weight to your height. While it has limitations and doesn’t measure body fat directly, it’s often used by healthcare professionals to broadly categorize a person’s weight and potential health risks.

You can calculate BMI using either the Metric System or the Imperial System (US Units).

Metric BMI Formula

The metric formula is the standard way to calculate BMI:

BMI Formula

Steps:

  1. Measure your weight in kilograms (kg).
  2. Measure your height in meters (m). If you know it in centimeters (cm), divide the centimeters by 100 to convert to meters (e.g. 175 cm / 100 = 1.75 m).
  3. Square your height in meters (multiply the height by itself).
  4. Divide your weight (kg) by your squared height (m2).

Example:

  • Weight: 75 kg
  • Height: 1.75 m

US Imperial BMI Formula

If you use pounds and inches, you’ll need a conversion factor (703) in the calculation:

Steps:

  1. Measure your weight in pounds (lb).
  2. Measure your height in inches (in). (Remember, 1 foot = 12 inches).
  3. Square your height in inches (multiply the height by itself).
  4. Divide your weight (lb) by your squared height (in2).
  5. Multiply that result by the conversion factor, 703.

Example:

  • Weight: 150 lb
  • Height: 5’5″ (which is 5 X 12 + 5 = 65 inches)

What Are Its Uses?

BMI is a quick, cheap, and non-invasive screening tool used for populations, not necessarily for diagnosing individuals.

  1. Public Health: To identify potential weight problems in large groups of people and track trends over time.
  2. Initial Assessment: Doctors and other health professionals use it as a starting point to assess a person’s health risks related to weight.
  3. Personal Tracking: Individuals can use it to get a general idea of their weight status and track changes over time.