Free BMI Calculator
A free tool that instantly calculates your body mass index (BMI), an underweight/normal/overweight/obese assessment, and the healthy weight range for your height from just your height and weight. All calculations happen in your browser, so the values you enter are never sent anywhere.
Enter your height and weight and press Calculate to see the results.
How to use
- Enter your height (cm) and weight (kg).
- Press "Calculate" to see your BMI and obesity assessment.
- You can also see the healthy weight range and standard weight for your height.
BMI classification (Asia-Pacific)
- Underweight: BMI below 18.5
- Normal: BMI 18.5 to under 23
- Overweight: BMI 23 to under 25
- Obese: BMI 25 to under 30
- Severely obese: BMI 30 or above
Frequently asked questions
Is the BMI calculator free?
Yes, it is completely free. You can use it right in your browser with no sign-up or software install.
How is BMI calculated?
BMI is your weight in kilograms divided by the square of your height in meters. For example, at 170 cm and 68 kg, it is 68 ÷ (1.7 × 1.7) = about 23.5.
What is the normal BMI range?
By the Asia-Pacific criteria, 18.5-22.9 is considered normal. 23 or above is overweight, and 25 or above is classified as obese.
Are the height and weight I enter sent to a server?
No. All calculations happen inside your browser, and the values you enter are not sent to any external server.