BMI Calculator
Enter your height and weight to quickly calculate your BMI and check your weight status.
BMI Calculation
Check your weight status based on your height and weight.
What Is a BMI Calculator?
A BMI calculator uses your height and weight to calculate your Body Mass Index (BMI) and provides a simple way to check your current weight status. BMI is calculated by dividing your weight in kilograms by the square of your height in meters and is widely used as a screening measure for adults.
This calculator uses adult BMI categories to classify results as underweight, normal, overweight, obesity, or severe obesity. BMI is a reference measure, so factors such as muscle mass, body fat percentage, and waist circumference should also be considered.
How to Calculate BMI
- BMI = weight (kg) Γ· [height (m) Γ height (m)]
- Convert your height from centimeters to meters before calculating
- Example: 170 cm and 65 kg β BMI approximately 22.5
- BMI is a reference measure for assessing weight status in adults
BMI Weight Status Categories
| Category | BMI | Description |
|---|---|---|
| Underweight | Below 18.5 | Below the normal weight range |
| Normal | 18.5 ~ 22.9 | Normal weight range |
| Overweight | 23.0 ~ 24.9 | Weight management may be recommended |
| Obesity | 25.0 ~ 29.9 | Obesity range |
| Severe Obesity | 30.0 or higher | Higher obesity range |
BMI Calculation Examples
| Height | Weight | BMI |
|---|---|---|
| 160 cm | 50 kg | 19.5 |
| 170 cm | 65 kg | 22.5 |
| 175 cm | 80 kg | 26.1 |
| 180 cm | 100 kg | 30.9 |
Frequently Asked Questions (FAQ)
Q. How is BMI calculated?
BMI is calculated by dividing your weight in kilograms by the square of your height in meters. For example, if you are 170 cm tall and weigh 65 kg, your BMI is approximately 22.5.
Q. What is the normal BMI range?
This calculator classifies adult BMI as underweight below 18.5, normal from 18.5 to below 23, overweight from 23 to below 25, obesity from 25 to below 30, and severe obesity at 30 or higher.
Q. Can BMI alone accurately determine obesity?
BMI is based only on height and weight, so it does not account for differences in muscle mass or body fat distribution. Other factors such as body fat percentage and waist circumference should also be considered when assessing health.
Q. Can children and teenagers use this BMI calculator?
Children and teenagers require age- and sex-specific growth standards, so adult BMI categories should not be applied directly to them.
Q. Can I use this BMI calculator on my phone?
Yes. The calculator is responsive and can be used on both desktop and mobile devices.
Important Notes
BMI is a reference measure and should not be used as the only indicator of health. Results may differ from actual body fat levels depending on factors such as body composition and muscle mass. Adult BMI categories should not be applied during pregnancy or to children and teenagers.