BMI Calculator

Measurement Units

Weight (in kg)

Height (in cm)

Body Mass Index (BMI)

25.0 kg/m2

What is BMI?

Body mass index(BMI): A measure that relates body weight to height. BMI can be a useful tool to estimate body fat and determine whether a person is at a healthy weight, it is not always an accurate measure of an individual's health. Other factors, such as muscle mass and body composition, can affect BMI readings and should be taken into consideration as well.

For example, Person having 65kg weight and 160.1 cm height have 25.36 kg/m2 BMI.

How do I calculate my BMI?

Here are the formulas for computing BMI in the International System of Units (SI) and the US customary system (USC):

  1. BMI = weight (in kilograms) / [height (in meters)]^2
  2. BMI = (weight (in pounds) / [height (in inches)]^2) x 703

BMI table for adults

The WHO recommends this as the ideal body weight based on BMI values for adults, which is applicable for both men and women aged 20 or older.

BMI Weight Status
Less than 18.5 Underweight
18.5 - 24.9 Normal weight
25.0 - 29.9 Pre-obese
30.0 - 34.9 Obese class I
35.0 - 39.9 Obese class II
40.0 and higher Obese class III

What are the risk of high BMI

Carrying excess body fat can have serious health consequences and can impact your overall health and quality of life.

  • High blood pressure
  • High cholesterol levels
  • Diabetes
  • Heart disease
  • Stroke, and many more

How to maintain a healthy BMI

To begin with, you can try doing moderate-intensity aerobic exercises for 150 minutes every week or vigorous-intensity aerobic exercises for 75 minutes every week. It is also essential to drink plenty of water and eat a balanced diet. If your BMI is not within the healthy range, then you might need to decrease the amount of food you eat and increase your physical activity.

Limitations of the BMI

The BMI is not capable of determining if someone has too much fat and cannot differentiate between excess fat, muscle or bone.

The adult BMI does not consider age, gender or muscle mass, which means that very muscular adults or athletes may be labeled as "overweight" or "obese," even if they have low body fat.

Conversely, adults who lose muscle as they age may fall into the "healthy weight" range even if they carry excess fat.

A woman's BMI during pregnancy will also be affected as her weight increases, and it is recommended to use her pre-pregnancy weight when calculating her BMI.

Despite these limitations, BMI remains a practical and convenient method of assessing weight.