To calculate your **BMI**,
enter your height and weight in the form below,

either metric or imperial.

Height | Weight BMI | Calculate BMI |
---|---|---|

**BMI** values according to **WHO**.

BMI range | Weight category |
---|---|

Underweight | |

-15.99 | Severe thinness |

16.00-16.99 | Moderate thinness |

17.00-18.49 | Mild thinness |

18.50-24.99 | Normal weight |

25.00-29.99 | Overweight |

30.00-34.99 | Obese - class I |

35.00-39.99 | Obese - class II |

40- | Obese - class III |

**BMI** means **Body Mass Index**.
The **BMI** shows the relation between a person's
height and weight, and can be used to indicate whether the person has a normal weight or
if he/she is underweight or overweight.
**BMI** can also be called the **Quetelet index**, after its inventor,
the Belgian scientist *Adolphe Quetelet* (1796-1874).

It is important to note that **BMI** is not actually a measurement for
the percentage of body fat, and is not applicable to everybody (e.g. persons with a large muscle mass or bodybuilders).

For children and teenagers **BMI** is calculated the same way, but
the thresholds for overweight, normal weight and underweight depends on the age and gender of the child.
The **BMI table** that is being used for adults is not applicable to children and teenagers.

Mathematically, **BMI** is kg/m^{2}
(kilograms per square meter).

(bodyweight in kg)

(bodyheight in meters)^{2}

=

(weight in kg)

(height in meters) * (height in meters)

** Example:** A person is 175 cm tall and has a weight of 70 kg.

70

1.75^{2}

=

70

1.75 * 1.75

=

70

3.0625

= 22.86 (normal weight)

To use pounds (lb) and feet (ft) instead of kilograms (kg) and meters (m), use the same fomula, but multiply the weight by 4.88.

(bodyweight in pounds) * 4.88

(bodyheight in feet)^{2}

=

(weight in pounds) * 4.88

(height in feet) * (height in feet)

** Example:** A person is 5'6" tall and has a weight of 160 lb.

5'6" = 5 + (6/12) = 5.5'

160 * 4.88

5.5^{2}

=

780.8

5.5 * 5.5

=

780.8

30.25

= 25.81 (overweight)

1 lb = 0.45359237 kg

1 ft = 0.3048 m

w * 0.45359237 kg

(h * 0.3048)^{2} m^{2}

=

w * 0.45359237 kg

h^{2} * 0.09290304 m^{2}

=

w * 4.8824276... kg

h^{2} m^{2}

Where **w** is the weight in pounds, and **h** is the height in feet.

To use pounds (lb) and inches (in) instead of kilograms (kg) and meters (m), multiply the weight by 703.

(bodyweight in pounds) * 703

(bodyheight in inches)^{2}

=

(weight in pounds) * 703

(height in inches) * (height in inches)

** Example:** A person is 5'6" tall and has a weight of 100 lb.

5'6" = (5*12) + 6 = 60 + 6 = 66"

100 * 703

66^{2}

=

70300

66 * 66

=

70300

4356

= 16.14 (underweight: moderate thinness)

1 lb = 0.45359237 kg

1 in = 0.0254 m

w * 0.45359237 kg

(h * 0.0254)^{2} m^{2}

=

w * 0.45359237 kg

h^{2} * 0.00064516 m^{2}

=

w * 703.0695796... kg

h^{2} m^{2}

Where **w** is the weight in pounds, and **h** is the height in inches.

**BMI Prime** is the BMI relative to
the upper limit for normal weight. I.e. when the BMI
is at the upper limit for normal weight, BMI Prime is 1.00.
A **BMI Prime** value larger than 1.00 indicates overweight.
For normal weight (BMI 18.5 - 25)
the value of **BMI Prime** is between 0.74 and 1.00.

For Asian body types, **BMI Prime** should be between 0.80 and 1.00
(BMI 18.5 - 23 for normal weight).
Please note that there may be differences in which BMI
is considered to be the upper limit for normal weight.

The formula to calculate **BMI Prime** is very simple:

25

Since the upper limit for normal weight is often lower for Asian body types, the formula for **BMI Prime**
looks like this:

23

**Please note** that there may be differences in which BMI
is considered to be the upper limit for normal weight.

In theory it is simple to lose weight. Use more energy than you take in (eat).

However, in practice it is not so simple as it may sound,
since it requires a lot of self control and hard work.
But do not give up! If you really put your mind to it, **you can do it**.
A good start could be to have a nice walk for at least 30-60 minutes every day.
If you think it is boring, you could listen to music or audio books while walking,
or walk with a friend.

If you start working out more than you are used to, you should consult your doctor first.

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