BMI Calculator
Free online BMI calculator providing instant, accurate results based on WHO standards. Calculate your Body Mass Index and get personalized health insights.
What is BMI?
Body Mass Index (BMI) is a widely used screening tool that helps assess body weight categories. It's calculated using your height and weight measurements and provides a reliable indicator of body fatness for most people.
The BMI formula used worldwide, as endorsed by the World Health Organization (WHO), is:BMI = weight(kg) / [height(m)]²
BMI Categories
Underweight
May indicate nutritional deficiency or other health issues
Normal Weight
Generally indicates optimal health status
Overweight
May increase risk of health conditions
Obese
Higher risk of various health complications
Note: While BMI is a useful screening tool, it's not a diagnostic measure. Factors such as age, gender, ethnicity, muscle mass, and body composition are not considered in BMI calculations.
For a complete health assessment, consult with healthcare professionals who can evaluate your BMI alongside other health indicators.
How to Use BMI Calculator
Enter Measurements
Input your height (cm) and weight (kg)
Auto Calculate
The system will automatically calculate your BMI
View Results
Understand your BMI range and health recommendations
Understanding Measurement Units
Height Units
Centimeters (cm)
Metric system, commonly used worldwide
Example: 170 cm = 1.7 meters
Feet (ft)
Imperial system, used in the US and UK
Example: 5'7" = 170 cm
Inches (in)
Imperial system, used with feet
Example: 67 inches = 170 cm
Weight Units
Kilograms (kg)
Metric system, standard unit worldwide
Example: 70 kg = 154 lbs
Pounds (lbs)
Imperial system, common in the US
Example: 154 lbs = 70 kg
Our BMI calculator automatically converts between different units for your convenience. Simply select your preferred units and enter your measurements.
BMI Calculator Examples
See how our BMI calculator handles different measurement units to provide consistent, accurate results
Using BMI Calculator with Metric Units
Height Input:
170 cm
Weight Input:
65 kg
BMI Result:
22.5
Normal weight
BMI Calculator with Feet and Pounds
Height Input:
5'7"(170 cm)
Weight Input:
143 lbs(65 kg)
BMI Result:
22.5
Normal weight
BMI Calculator with Inches
Height Input:
67 inches(170 cm)
Weight Input:
143 lbs(65 kg)
BMI Result:
22.5
Normal weight
Our online BMI calculator makes it easy to calculate your Body Mass Index regardless of your preferred units. Try our BMI calculator now to get instant, accurate results with any combination of measurement units.
What Users Say About Our BMI Calculator
John D.
Fitness Enthusiast
"This BMI calculator is the most accurate tool I've found! I use it regularly to track my BMI and fitness progress. The instant results and detailed BMI recommendations are super helpful."
Sarah M.
Personal Trainer
"As a trainer, I recommend this online BMI calculator to all my clients. It's the most reliable BMI measurement tool, easy to use, and provides clear health insights based on BMI ranges."
Robert K.
Healthcare Professional
"A professional BMI calculator that's both reliable and straightforward. I appreciate how it provides both metric and imperial measurements for BMI calculation. Perfect for quick assessments."
Emily W.
Nutrition Coach
"This is my go-to BMI calculator for client consultations. The BMI charts are clear, calculations are instant, and the BMI-based health guidance is comprehensive."
James H.
Weight Loss Journey
"Been using this free BMI calculator to track my progress. The BMI tracking feature is simple yet accurate, and helps me stay motivated with my health goals."
Linda P.
Wellness Blogger
"The best online BMI calculator I've found! The BMI results are instant, and the health recommendations based on your BMI score are detailed and helpful. Highly recommend!"