Health & Fitness Tool
BMI Calculator
Calculate your Body Mass Index (BMI) to determine if you are at a healthy weight.
Σ The Formula
BMI = Weight(kg) / Height(m)²
Real World Examples
Healthy Range
70kg / 1.75m → 22.86 (Normal)
Overweight
90kg / 1.80m → 27.78 (Overweight)
# About This Calculator
Body Mass Index (BMI) is a widely used screening tool that categorizes a person's weight status based on their height. It is defined as weight in kilograms divided by the square of height in meters ($kg/m^2$).
While simple, BMI is a powerful indicator of potential health risks. Maintaining a healthy BMI is associated with a lower risk of chronic diseases such as type 2 diabetes, heart disease, high blood pressure, and certain cancers.
Understanding the Categories
- Underweight (Below 18.5): May indicate malnutrition, eating disorders, or other health issues.
- Normal Weight (18.5 – 24.9): Generally associated with the lowest risk of weight-related health issues.
- Overweight (25.0 – 29.9): Increased risk of developing health problems.
- Obese (30.0 and Above): High risk of cardiovascular disease, diabetes, and other metabolic conditions.
Limitations of BMI
BMI is not a direct measure of body fat. It does not distinguish between muscle mass and fat mass. Therefore:
- Athletes: May have a high BMI due to muscle density but low body fat.
- Elderly: May have a "normal" BMI but lose muscle mass (sarcopenia) and gain visceral fat.
How To Use
- Select your preferred unit system (**Metric** or **Imperial**).
- Enter your **Weight** in kg or lbs.
- Enter your **Height** in cm or feet/inches.
- Click **Calculate BMI**.
- Review your **Score** and **Category** (Normal, Overweight, etc.).
Frequently Asked Questions
Is BMI accurate for athletes?+
Often no. Muscle tissue is dense and heavy. A bodybuilder might have a BMI of 30 (Obese range) despite having very low body fat. For athletes, body fat percentage measurements are more accurate.
Does BMI differ for men and women?+
The calculation matches for both, but body composition differs. Women typically have more body fat than men at the same BMI. However, the standard WHO categories apply to both genders for adults.
What is the best time to weigh myself?+
For the most consistent results, weigh yourself first thing in the morning, after using the bathroom and before eating or drinking, while wearing minimal clothing.
Can BMI predict my health?+
It is a risk indicator, not a diagnostic tool. A high BMI suggests you *might* have excess body fat, but a doctor would look at other factors like waist circumference, blood pressure, and cholesterol to assess actual health.
Is BMI Calculator free to use?+
Yes, BMI Calculator on Matheric is completely free to use. We believe in accessible education and utility for everyone.
How accurate is BMI Calculator?+
We use standard mathematical formulas and high-precision computing algorithms to ensure results for BMI Calculator are accurate for academic and professional use.