This free bmi calculator will determine your body mass index based on your weight and height.
You can select from either imperial measurements like feet and inches, or metric such as meters and centimeters.
Instructions
- Enter your height in feet/inches or meters/centimetres
- Enter your weight. If you choose kilograms or stones enter a decimal point as required. For example, if you weigh 11 stone 7lbs enter “11.5”.
Once you’ve used the free bmi calculator, use the table below to determine what your score means. But remember that body mass index has its limitations.
Look at the bmi chart below to see what your score means
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Risk of Associated Disease According to BMI and Waist Size |
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| BMI | Waist less than or equal to 40 in. (men) or 35 in. (women) |
Waist greater than 40 in. (men) or 35 in. (women) |
|
| 18.5 or less | Underweight | — | N/A |
| 18.5 – 24.9 | Normal | — | N/A |
| 25.0 – 29.9 | Overweight | Increased | High |
| 30.0 – 34.9 | Obese | High | Very High |
| 35.0 – 39.9 | Obese | Very High | Very High |
| 40 or greater | Extremely Obese | Extremely High | Extremely High |
There are two extra columns on this bmi chart for waist measurement. Physicians often use waist measurements alongside bmi to determine if you are at an increased risk from certain degenerative illnesses.