BMI Calculator
? Frequently Asked Questions
How is BMI calculated?
BMI (Body Mass Index) is calculated as weight in kilograms divided by height in meters squared (kg/m²). The formula is: BMI = weight / (height × height).
Can I use imperial units (pounds and feet)?
Yes! The calculator accepts both metric (kg, cm) and imperial (lbs, feet/inches) units. It automatically converts and calculates the correct BMI regardless of which system you use.
What BMI ranges are considered healthy?
Generally, BMI under 18.5 is underweight, 18.5-24.9 is normal, 25-29.9 is overweight, and 30+ is obese. However, BMI doesn't account for muscle mass, bone density, or body composition.
Is BMI accurate for everyone?
BMI is a screening tool but has limitations. It may overestimate body fat in athletes with high muscle mass and underestimate it in older adults who've lost muscle. Consider it alongside other health metrics.
Does age or gender affect BMI interpretation?
The BMI formula is the same for all adults, but interpretation varies. Children use age-specific percentile charts, and some research suggests different healthy BMI ranges for different ethnic groups and ages.
Is my data safe and secure?
Yes, absolutely! This tool runs entirely in your browser. All data processing happens locally on your device - nothing is uploaded to our servers. Your files and data never leave your computer, ensuring complete privacy and security.