BMI Calculator

Tool Guide

About the BMI (Body Mass Index) Calculator

The online BMI (Body Mass Index) calculator quickly computes BMI from height and weight to help assess your health status.

The BMI value helps determine whether your weight is underweight, normal, overweight, or obese. This calculator is suitable for people aged 18 and above; for those under 18, we recommend referring to a growth and development chart or the overweight/obesity criteria table for children and adolescents aged 7-17.

BMI does not directly measure body fat percentage and may not be applicable to athletes, people with high muscle mass, or special populations (such as pregnant women and the elderly).

How to Use the BMI Calculator

Step 1: Enter your height (cm) and weight (kg).

Step 2: Click the "Calculate BMI Now" button to get your BMI value.

Step 3: Refer to the BMI standards to assess your health status.

BMI Calculator FAQ

What is BMI?

BMI (Body Mass Index) is an indicator used to measure the ratio of a person's weight to height, commonly used to assess health status.

BMI formula: BMI = weight (kg) ÷ height² (m²).

Does BMI apply to everyone?

BMI applies to most adults, but it may not be applicable to pregnant women, athletes, or people with high muscle content.

Is BMI calculation accurate?

BMI is based only on height and weight and cannot measure body fat percentage or muscle ratio, so it is for reference only.

How can I improve my BMI?

Maintain a normal BMI through a balanced diet, moderate exercise, and a healthy lifestyle.

How is BMI calculated for children and adolescents?

People under 18 should refer to growth and development standards rather than a BMI calculator.