Body Mass Index (BMI) is a calculation using height and weight. The formula is BMI = kg/m² where kg is weight in kilograms and m² is height in meters squared.

What is a healthy BMI range?

A healthy BMI range is 18.5 to 24.9. BMI below 18.5 is considered underweight, 25-29.9 is overweight, and 30+ is obese.

Back to home

BMI Calculator

Calculate your Body Mass Index (BMI) to determine if you're at a healthy weight for your height.

Calculate Your BMI

Enter your weight and height to get started

Unit System

Weight (kg)

Height (cm)

About BMI Calculator

Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is BMI = kg/m² where kg is a person's weight in kilograms and m² is their height in meters squared. A BMI of 25.0 or more is overweight, while the healthy range is 18.5 to 24.9.

BMI applies to most adults 18-65 years. It should not be used for athletes, pregnant women, or young children. BMI is a screening tool and does not diagnose body fatness or health. A healthcare provider should perform appropriate health assessments.

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

Related Calculators

Explore more free online calculators to help with your calculations

Calorie Calculator

Calculate daily caloric needs for weight management

Age Calculator

Calculate your exact age from birth date

Percentage Calculator

Calculate percentage changes and values

Take this calculation further

Browse the health calculators collection for more tools in this subject.

For a related calculation, use Body Fat Calculator to calculate body fat percentage using the US Navy method with waist, neck, and hip measurements. Alternatively, use Healthy Weight Calculator to find your healthy weight range based on BMI guidelines for your height.