BMI Calculator - Calculate Your Body Mass Index
What is BMI?
Body Mass Index (BMI) is a measure of body fat based on height and weight. The formula is: BMI = weight(kg) ÷ height(m)²
BMI Categories
- Underweight: Below 18.5
- Normal weight: 18.5 - 24.9
- Overweight: 25 - 29.9
- Obese: 30 and above
How to Calculate BMI?
Example: If you weigh 70kg and your height is 175cm (1.75m), then:
BMI = 70 ÷ (1.75 × 1.75) = 70 ÷ 3.0625 = 22.86
This falls in the Normal weight category.
Why BMI Matters?
BMI helps assess health risks related to weight. Maintaining a healthy BMI reduces risk of heart disease, diabetes, high blood pressure, and other conditions.
Limitations of BMI
BMI doesn't distinguish between muscle and fat. Athletes may have high BMI but low body fat. Older adults may have normal BMI but low muscle mass.
Frequently Asked Questions
BMI is generally accurate for most adults 18-65, but may not be accurate for athletes, pregnant women, or older adults.
A BMI between 18.5 and 24.9 is considered healthy for most adults.
Children need age- and gender-specific BMI percentiles. This calculator is for adults 18+.