BMI Calculator
Body Mass Index calculator
BMI Calculator
Calculate your Body Mass Index (BMI) instantly. Check if your weight is healthy for your height.
BMI Categories
Key Features & Highlights
Uses the internationally recognized BMI formula (weight/height²) endorsed by World Health Organization.
Switch between kg/cm and lbs/inches with a single click. Perfect for any country's measurement system.
Instantly know if you're underweight, normal, overweight, or obese with clear category labels.
Get personalized ideal weight range based on your height for a healthy BMI (18.5-24.9).
No data sent to servers. All BMI calculations happen locally in your browser.
Responsive design works on any device - mobile, tablet, or desktop instantly.
How to Use BMI Calculator
Choose Unit System
Select Metric (kg/cm) or Imperial (lbs/inches) based on your preference.
Enter Your Weight
Type your current weight in kilograms or pounds - accurate to nearest 0.1.
Enter Your Height
Input your height in centimeters or feet/inches for precise calculation.
View BMI Result
See your BMI value, category (normal/overweight etc), and ideal weight range instantly.
Frequently Asked Questions
What is a healthy BMI range?
A BMI between 18.5 and 24.9 is considered healthy for most adults. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese.
Is BMI accurate for athletes?
BMI may overestimate body fat in athletes and muscular individuals since muscle weighs more than fat. Athletes should use body fat percentage instead.
How is BMI calculated?
BMI = weight (kg) / height² (m²). For imperial: BMI = (weight in lbs × 703) / height² (inches²). Our tool handles both formulas automatically.
Does BMI work for children?
BMI for children uses percentiles based on age and gender, which differ from adult calculations. This tool is designed for adults 18+.
Should I use BMI or body fat percentage?
BMI is a quick screening tool. Body fat percentage is more accurate for fitness assessment. Both together give the best health picture.
Why does my BMI change with age?
Muscle mass typically decreases with age, so the same BMI can mean different body compositions. Combine BMI with waist measurements for better insights.