Enter your height and weight to see your Body Mass Index and where it sits on the adult range.
By Hammad ShahidLast updated
For adults, 18.5 to 24.9. BMI is your weight in kilograms divided by your height in metres squared, so 70 kg at 175 cm gives 22.9, and at that height the healthy band runs from 57 to 76 kg. The figure cannot tell muscle from fat, and the bands are for adults only: children are assessed against age-and-sex percentile charts instead.
Body Mass Index is a single number that relates your weight to your height. It was designed to describe populations rather than individuals, and it remains one of the most widely used screening measures because it needs only two easily obtained measurements. The categories on this page are the standard adult bands and do not apply to children or teenagers, who are assessed against age-and-sex percentile charts instead.
BMI divides your weight in kilograms by the square of your height in metres. If you enter imperial units, FitQuota converts them first, so the arithmetic is identical either way.
1. Convert your measurements to metric
weight in kg = lb × 0.453592, and height in cm = (ft × 30.48) + (in × 2.54)
2. Convert your height to metres
height in m = height in cm ÷ 100
3. Divide weight by height squared
BMI = weight in kg ÷ (height in m × height in m)
For example, someone who is 175 cm and 70 kg has a BMI of 70 ÷ (1.75 × 1.75) = 22.9.
These are the standard adult bands used by most health organisations.
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Healthy weight |
| 25.0 – 29.9 | Overweight |
| 30.0 or higher | Obesity |
The healthy band is a BMI of 18.5 to 24.9, which works out as a different weight range for every height. Every figure below was produced by the same code that runs the calculator above, rounded to the nearest whole unit.
| Height | Healthy weight (kg) | Healthy weight (lb) |
|---|---|---|
| 150 cm (4’11”) | 42 to 56 | 92 to 124 |
| 155 cm (5’1”) | 44 to 60 | 98 to 132 |
| 160 cm (5’3”) | 47 to 64 | 104 to 141 |
| 165 cm (5’5”) | 50 to 68 | 111 to 149 |
| 170 cm (5’7”) | 53 to 72 | 118 to 159 |
| 175 cm (5’9”) | 57 to 76 | 125 to 168 |
| 180 cm (5’11”) | 60 to 81 | 132 to 178 |
| 185 cm (6’1”) | 63 to 85 | 140 to 188 |
| 190 cm (6’3”) | 67 to 90 | 147 to 198 |
| 195 cm (6’5”) | 70 to 95 | 155 to 209 |
Use it as orientation rather than a target. Sitting a kilogram outside a band does not mean anything happened to your health at the moment you crossed it; the thresholds are round numbers chosen for population screening, not cliffs.
No. The bands above are the adult ones. Children and teenagers up to about 20 are assessed against age-and-sex percentile charts instead, because the healthy range for a growing body changes year by year and differs between boys and girls. Putting a fourteen-year-old through an adult BMI calculator produces a number, but not a meaningful one. This calculator is for adults.
BMI is a height-to-weight screening measure and that is the whole of what it does. It cannot tell muscle from fat, so two people with the same BMI can have very different bodies, and a result outside the healthy band is a prompt to look further rather than a diagnosis of anything on its own.
Whether that matters for you depends on who you are, which is a longer answer than belongs on a calculator page. There is a full one in why BMI misreads muscular people, covering athletes, older adults, and the populations some health bodies apply different thresholds to. If you want an estimate of body composition rather than a height-to-weight ratio, the body fat calculator is the closer tool, with its own error margin stated.
The adult BMI categories and the definition of BMI as a screening measure.
Centers for Disease Control and Prevention. Adult BMI Categories.
BMI is a screening measure, not a diagnosis or a complete picture of health. The bands shown apply to adults only.
If you have a medical condition, are pregnant or breastfeeding, have a history of eating disorders, or are making a significant change to how you eat or train, consider speaking with a qualified healthcare professional.
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