BMI Calculator
WHO standard health classification
Adult categories use WHO cutoffs (normal 18.5 to under 25). Based on WHO international standards
Quick guide
What can BMI Calculator help you do?
Free BMI calculator with WHO standard classification. Shows category and ideal weight range.
Best for
Estimate adult BMI, category, and ideal weight from Height and Weight. English uses WHO cutoffs; BMI does not measure body fat or health.
How to use it
Enter Height (cm) and Weight (kg). The page updates BMI, category, scale, and ideal range. WHO uses 25 for overweight and 30 for obesity.
How to read the result
At 170 cm and 65 kg, BMI is 22.49. English uses 25/30; Chinese pages use Taiwan cutoffs of 24/27.
Privacy and limits
Height, weight, BMI, and ideal range stay in your browser, are not uploaded, and are not saved by this page.
BMI can mislead for children, athletes, seniors, or during pregnancy. Ask a doctor before diet or medication changes.
Frequently Asked Questions
How is BMI calculated?
BMI = weight (kg) / height (m)². Example: 60 / 1.7² = 20.76.
Is BMI accurate?
BMI doesn't account for muscle mass or body fat percentage. Athletes may be classified as overweight despite being healthy.