BMI Calculator
Calculate your Body Mass Index (BMI) to check if your weight is healthy. Supports both metric and imperial units.
About BMI Calculator
Body Mass Index is the standard quick-check for whether your weight falls in a healthy range relative to your height. This BMI calculator accepts measurements in either metric (kilograms and centimeters) or imperial (pounds and feet/inches) units, computes your BMI instantly, and shows where you fall on the standard WHO classification chart — underweight, normal, overweight, obese — along with the specific BMI range for each category.
BMI is a screening tool, not a diagnostic one, and works best as a starting point for further conversation with a healthcare professional rather than a definitive judgement. It does not distinguish between muscle and fat mass, so athletes and very muscular individuals often score in the 'overweight' range despite being healthy. Useful as one input among many when tracking health goals over time.
How to Use
Select your preferred unit system (metric or imperial).
Enter your weight and height.
Click 'Calculate' to see your BMI and category.
Check the BMI chart below to see all weight categories.
Frequently Asked Questions
What is BMI?
BMI (Body Mass Index) is a simple measure of body fat based on height and weight. It's calculated by dividing your weight in kilograms by the square of your height in meters (kg/m²).
Is BMI accurate for everyone?
BMI is a useful screening tool but doesn't directly measure body fat. It may not be accurate for athletes (high muscle mass), elderly people, or children. Consult a healthcare professional for a complete assessment.
What is a healthy BMI range?
A BMI between 18.5 and 24.9 is considered normal/healthy weight. Below 18.5 is underweight, and above 25 is overweight.
How is BMI calculated?
BMI = weight (kg) ÷ height² (m²). For example, a person weighing 70 kg and 175 cm tall: BMI = 70 ÷ (1.75 × 1.75) = 22.86.
BMI Calculator: Calculate Your Body Mass Index with Health Charts
BMI is the most widely used health screening metric in the world. Learn what it means, how it is calculated, and what the result tells you (and does not).
Read the full guide