BMI Calculator

  • Underweight
  • Normalweight
  • Overweight
  • Obesity

Calculate body mass index

lbs ({{weight_m}} kg)
feet inches ({{height_m}} cm)
kgs ({{weight_i}} lb)
cm ({{height_i_feet}}feet {{height_i_inch}}inches )

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Your body mass index (BMI) is {{bmi}}.
In {{country}},
  • Average BMI is {{cData[country][0]}},
  • Average BMI for male is {{cData[country][1]}},
  • Average BMI for female is {{cData[country][2]}}.


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How to use the BMI calculator

  • BMI - Body Mass Index
    • Underweight <=18.5
    • Normal weight = 18.5–24.9
    • Overweight = 25–29.9
    • Obesity = BMI of 30 or greater

How to calculate Body Mass Index(BMI)

Body Mass Index (BMI) is the most common method to figure out your body shape through measuring your weight (body mass) and height. The BMI formula is the weight (body mass) divided by the square of height.

BMI Calculation Formula

Imperial formula

BMI calculation formula (Imperial)

Metric formula

BMI calculation formula (Metric)

What does your Body Mass Index(BMI) number mean

BMI Range BMI Result Suggestions
<18.5 Underweight
  1. Being underweight may caused by genetics, metabolism, or lack of food.
  2. Being underweight may put you at risk for developing some health problems. Please discuss with your doctor for more information.
  3. To reach a healthy weight, suggest you do more exercises, taking more healthy calories and improving your diet. Quitting smoking may also helpful.
18.5-24.9 Normal weight Being normal weight means you are having a healthy weight. Keep on going with your health eating such as good diet with high-quality nutrition, having regular life and doing physical exercises.
25-29.9 Overweight
  1. Being overweight may caused by many reasons, such as genetic, high stress and poor diet, side effects of medicines (e.g. olanzapine) or more common reason like overeating but not doing enough physical exercises.
  2. Being overweight, sometimes regarded as pre-obesity may put you at rich for some chronic diseases. Please discuss with your doctor on how to achieve a healthy weight.
  3. To reach a healthy weight, you may improve your diet with rich nutrition, taking lower calorie and doing more physical exercises. Having a regular life like the amount of high-quality sleep may also helpful.
>30 30.0–34.9 class I obesity
35.0–39.9 class II obesity
≥ 40.0   class III obesity
  1. Being obesity may caused by genetic, poor diet and nutrition, side effects of medicines (e.g. Olanzapine), not living a regular life(e.g. lack of efficient sleeping) and taking too much calorie but doing not enough physical exercises. Sometimes, emotional factors when people are stressed, angry or upset may cause overweight or obesity.
  2. Being obesity may put you at rich for some chronic diseases such as heart disease and diabetes. Please discuss with your doctor on how to achieve a healthy weight.
  3. To reach a healthy weight, you may need to improve your diet with rich nutrition, taking lower calorie and doing more physical exercises. Having a regular life like the amount of high-quality sleep may also helpful.

This BMI calculator may not suitable for following people.

  • An athlete
  • People who are doing weight training (e.g. Sumo wrestler)
  • Women are being pregnant or nursing baby.
  • People who are with weakened health or sedentary elderly

What's BMI standards for Asians

It is generally believed that the Asians have different Body mass index (BMI) cut-off points for determining overweight and obesity.

BMI Result BMI range for Asians (kg/m2) BMI number for Europeans (kg/m2)
Underweight <18.5 <18.5
Normal weight 18.5-22.9 18.5-24.9
Overweight 23-24.9 25-29.9
Obesity >25 >30

How does BMI work for children

Body Mass Index (BMI) is used differently for children. First step is to get individual children BMI number using the same formula. In this way collect a statistical data of same age and sex children from the same area, such as same country or same continent, etc. And then compare individual children’s BMI number to the statistical data. If a BMI is at the range of less than 5% will be considered as underweight. And if a BMI is within the range of 85%-95% will be considered overweight or obesity and may have potential risks of developing health problems.

To determine whether people are at overweight risks more precisely and thoroughly, please use the calculators of Body Fat Percentage calculator, Basal Metabolic Rate (BMR) calculator, and Daily Calorie Requirement calculator.

US military recommended height-weight screening table

The below table shows maximum and minimum screening weights based on selected BMI standards.

Height
(inches)
Maximum weights (pounds)
for BMI = 27.5
(regardless of age)
Maximum weights (pounds)
for BMI = 25.0
(regardless of age)
Minimum weights (pounds)
for BMI = 19.0
 
58 131 119 91
59 136 124 94
60 141 128 97
61 145 132 100
62 150 136 104
63 155 141 107
64 160 145 110
65 165 150 114
66 170 155 117
67 175 159 121
68 180 164 125
69 186 169 128
70 191 174 132
71 197 179 136
72 202 184 140
73 208 189 144
74 214 194 148
75 220 200 152
76 225 205 156
77 231 210 160
78 237 216 164
79 244 221 168
80 250 227 173