Easy Way to Calculate BMI by Hand
Body Mass Index (BMI) is a simple way to check if your weight is healthy for your height. Knowing your BMI can help you decide if you need to lose, gain, or maintain your weight. Calculating BMI by hand is easy and can be done using the formula: BMI = weight(kg) / (height(m))².
How to Use This Calculator
- Enter your height in centimeters.
- Enter your weight in kilograms.
- Click the ‘Calculate’ button.
Formula & Methodology
The BMI formula is: BMI = weight(kg) / (height(m))². Here’s how it works:
- Convert your height from centimeters to meters by dividing by 100.
- Divide your weight (in kilograms) by the result from step 1.
- The result is your BMI.
Real-World Examples
Example 1
Height: 175 cm, Weight: 75 kg
BMI = 75 / ((175/100)²) = 24.96
Example 2
Height: 160 cm, Weight: 60 kg
BMI = 60 / ((160/100)²) = 23.44
Example 3
Height: 180 cm, Weight: 80 kg
BMI = 80 / ((180/100)²) = 24.69
Data & Statistics
| BMI | Category |
|---|---|
| <18.5 | Underweight |
| 18.5-24.9 | Normal weight |
| 25.0-29.9 | Overweight |
| 30.0 and above | Obesity |
| Country | Average BMI |
|---|---|
| USA | 30.0 |
| UK | 27.8 |
| Japan | 22.1 |
Expert Tips
- Regularly monitor your BMI to track your weight changes.
- Use a reliable scale and measure your height accurately.
- BMI is not suitable for children, pregnant women, or the elderly.
Interactive FAQ
What is a healthy BMI range?
A healthy BMI range is 18.5-24.9.
Can BMI be inaccurate?
Yes, BMI can be inaccurate for certain groups like athletes, pregnant women, or the elderly.
For more information, see the CDC’s guide on BMI and the WHO’s facts on obesity.