BMI Calculator
What is the BMI Calculator?
The BMI Calculator is a free online health tool that computes your Body Mass Index — a widely used measure of body weight relative to height. BMI is used as a general indicator of whether a person is underweight, at a healthy weight, overweight, or obese.
BMI is calculated by dividing your weight in kilograms by the square of your height in meters. While BMI does not measure body fat directly, it is a practical screening tool used by healthcare professionals worldwide for initial health assessments. Our calculator supports both metric and imperial units.
Key Features
- Supports both metric (kg/cm) and imperial (lb/ft) units
- Instant BMI calculation with health category result
- Clear interpretation: underweight, normal, overweight, or obese
- Free with no registration required
- Works on desktop and mobile browsers
How to Use the BMI Calculator
- 1
Enter Your Weight
Input your current body weight in kilograms or pounds.
- 2
Enter Your Height
Input your height in centimeters or feet and inches.
- 3
View Your BMI
Your BMI score will be calculated instantly, along with your weight category and what it means for your health.
Who Uses the BMI Calculator?
Personal Health Tracking
Monitor your BMI over time as part of a broader approach to managing your weight and health.
Fitness & Wellness
Use BMI as a starting reference point when setting fitness goals or planning a diet and exercise program.
Healthcare Screening
Healthcare providers use BMI as a quick first step in assessing patient weight status during routine checkups.
Parental Guidance
Parents and caregivers can use BMI calculations to track healthy development in children and teenagers.
Frequently Asked Questions
What is a healthy BMI range?
For adults, a BMI between 18.5 and 24.9 is considered healthy. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is classified as obese according to standard WHO guidelines.
Is BMI the same for men and women?
The BMI formula is the same for both men and women, but the health implications may differ. BMI does not account for differences in muscle mass, bone density, or fat distribution between sexes.
Can BMI be misleading?
Yes, BMI has limitations. Athletes with high muscle mass may have a high BMI without excess body fat. Elderly individuals may have a normal BMI but still carry excess fat. Always consult a healthcare professional for a full health assessment.
What units does the calculator support?
The calculator supports both metric units (kilograms and centimeters) and imperial units (pounds and feet/inches). Select your preferred system before entering your measurements.
Is this a medical diagnosis tool?
No. This BMI calculator is for informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Consult a qualified healthcare provider for personalized health guidance.