Enter your weight and height in metric or imperial units. You get your body mass index, the adult category it falls in and the weight range that matches a BMI of 18.5 to under 25 at your height.
Updated
BMI is a screening measure for adults aged 20 and over. It does not measure body fat or health directly; muscle, age, sex and ethnicity all change what it means. Not a diagnosis.
lb × 0.45359237 = kg · ft × 30.48 + in × 2.54 = cm. Imperial entries are converted first, so 703 × lb ÷ in² is not used directly; it gives practically the same result.
BMI = kg ÷ (cm ÷ 100)², shown rounded to one decimal.
under 18.5 · 18.5 to under 25 · 25 to under 30 · 30 to under 35 · 35 to under 40 · 40 or more [1].
18.5 × m² to 25 × m², shown in the weight unit you chose.
Each row was entered into this calculator and the result copied as shown.
| Entry | BMI | Category | BMI 18.5 to under 25 at this height |
|---|---|---|---|
| 80 kg · 180 cm | 24.7 | Healthy weight | 59.9 kg – 81 kg |
| 55 kg · 168 cm | 19.5 | Healthy weight | 52.2 kg – 70.6 kg |
| 96 kg · 175 cm | 31.3 | Class 1 obesity | 56.7 kg – 76.6 kg |
| 176 lb · 5 ft 11 in | 24.5 | Healthy weight | 132.6 lb – 179.2 lb |
| Category | BMI [1] |
|---|---|
| Underweight | under 18.5 |
| Healthy weight | 18.5 to under 25 |
| Overweight | 25 to under 30 |
| Class 1 obesity | 30 to under 35 |
| Class 2 obesity | 35 to under 40 |
| Class 3 obesity | 40 or more |
These categories are for adults aged 20 and over [1].
BMI is the same formula for everyone; the CDC uses the same adult cutoffs regardless of age, sex or race and asks that it be read alongside other health information [1].
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BMI is worked out from weight and height only, so it cannot tell muscle from fat. That is why the CDC describes it as a screening measure to consider alongside other health factors [1].
Not with these categories, which are for adults aged 20 and over [1]. This calculator does not do children’s BMI.
No. The CDC uses the same adult cutoffs regardless of age, sex or race [1]. What a given BMI means for one person can still differ, which is why it is only a screening measure.
The labels of weight-management medications describe their use in adults with obesity, or with overweight and at least one weight-related condition [2][3], and their clinical trials enrolled people by BMI, for example a BMI of 27 or more with type 2 diabetes [2][3]. Whether a medication suits you is your prescriber’s call.
No. The CDC calls BMI a screening measure that should be considered with other health factors [1].
Pounds are converted to kilograms and feet and inches to centimetres, then the metric formula is applied. The classic 703 × lb ÷ in² shortcut gives practically the same number.
It is 18.5 × height² to 25 × height², the weights that would give a BMI in the CDC’s healthy-weight band at your height [1]. It is arithmetic, not a goal.
Yes. You can log weigh-ins in PepLabo, set a goal weight and see the trend as a line next to your doses.
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