BMI Calculator

This page provides a BMI calculator online, free and without any ads or distractions. This is part of a series of free nutrition tools we provide at NutriAdmin.

Explore the full range of tools on this site! You can bookmark this page and come back anytime you need to calculate nutrition-related values.

Please enter weight and height below to calculate BMI

What is BMI?

BMI stands for Body Mass Index. It is a measure that uses a person's height and weight to estimate whether they have a healthy body weight for their height.

What is a BMI calculator?

A BMI calculator allows you to enter height and weight (in your preferred units) to calculate BMI.

What is the formula for BMI?

BMI is calculated by dividing a person's weight in kilograms by the square of their height in meters. The formula is:

BMI = weight (kg) / [height (m)]2

On the other hand, if calculating BMI using Lbs for weight and Ft/in for height, the formula is adjusted to:

BMI = weight (lbs) × 703 / (height (ft) × 12 + height (in))2

You can simply enter height and weight in your preferred units in the calculator above to get your result.

What is a healthy BMI?

BMI is commonly used as a screening tool to categorize individuals into weight categories such as underweight, normal weight, overweight, and obese.

The BMI calculator can help you determine the BMI of a person and then compare it with the ranges below.

These are the ranges based on the World Health Organization's BMI values :
  • Underweight. BMI less than 18.4
  • Normal weight. BMI between 18.5 and 24.9
  • Overweight. BMI between 25 and 29.9
  • Obese. BMI over 30

You can refer to the chart below for a visual representation of the different BMI ranges.

BMI calculator ranges

What are the limitations of the BMI calculator?

It's important to note that BMI is a simple measurement and doesn't directly measure body fat.

Due to the limitations of BMI, the formula may not be accurate for certain populations, such as athletes with a higher muscle mass, or for individuals with specific health conditions. Always consult with a healthcare professional for personalized health advice.

Further information on BMI

Check out this Wikipedia article for more information on the body mass index.