Calculate Body Mass Index (BMI)
What is Calculating Body Mass Index (BMI) by Hand and Why it Matters
Body Mass Index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. It’s a simple way to check if your weight is healthy for your height. Here’s why calculating BMI by hand is important…
How to Use This Calculator
- Enter your weight in kilograms (kg).
- Enter your height in centimeters (cm).
- Click ‘Calculate’.
Formula & Methodology
The formula for calculating BMI is:
BMI = weight(kg) / (height(m))2
Where height is converted to meters by dividing by 100 (since height is given in cm).
Real-World Examples
Data & Statistics
| BMI | Category |
|---|---|
| <18.5 | Underweight |
| 18.5-24.9 | Normal weight |
| 25-29.9 | Overweight |
| 30 or more | Obesity |
| Country | Average BMI |
|---|---|
| USA | 29.9 |
| UK | 27.6 |
| Japan | 22.1 |
Expert Tips
- Regular exercise and a balanced diet can help maintain a healthy BMI.
- BMI is not suitable for children under 2 years old, pregnant women, or older adults (over 65).
- For a more accurate measure of body fat, consider using methods like DEXA scans or skinfold calipers.
Interactive FAQ
What is a healthy BMI range?
A healthy BMI range is 18.5-24.9.
Can I use this calculator if I’m under 18?
No, this calculator is not suitable for children under 18.
For more information, see the CDC’s guide on BMI and the WHO’s factsheet on obesity and overweight.