BMI Calculator
Calculate body mass index in metric or imperial units and see the standard WHO category. An informational tool, not medical advice.
On your device: nothing you enter here is uploaded.
Your measurements
Result
For your height, the 18.5 to 24.9 band corresponds to 56.7 to 76.3 kg.
Informational only, not medical advice. BMI describes populations better than individuals: it cannot tell muscle from fat. Talk to a doctor about your health.
What this tool is for
Body mass index is weight divided by height squared. It was designed to describe populations, not individuals, and it says nothing about how much of a given weight is muscle, bone or fat: athletes routinely land in the overweight band while being nothing of the kind. Treat the number as one rough signal among many. This tool is informational and is not medical advice. For anything about your health, ask a doctor.
BMI categories for adults
These are the World Health Organization bands for adults aged 20 and over. They do not apply to children and teenagers, whose BMI is read against growth charts for their age and sex.
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 to 24.9 | Healthy weight |
| 25 to 29.9 | Overweight |
| 30 to 34.9 | Obesity, class 1 |
| 35 to 39.9 | Obesity, class 2 |
| 40 and above | Obesity, class 3 |
BMI in pounds and inches
The imperial formula is weight in pounds times 703, divided by height in inches squared. A person who is 5 ft 9 in (69 inches) and weighs 160 lb has a BMI of 160 x 703 / 4761, which is about 23.6. Switch the calculator to imperial and it does this for you, then shows the healthy weight range for your height in pounds.
Healthy weight range by height
The weight that corresponds to a BMI of 18.5 to 24.9 at common heights, rounded to the nearest pound or tenth of a kilogram.
| Height | Healthy weight |
|---|---|
| 5 ft 0 in | 95 to 127 lb |
| 5 ft 2 in | 101 to 136 lb |
| 5 ft 4 in | 108 to 145 lb |
| 5 ft 6 in | 115 to 154 lb |
| 5 ft 8 in | 122 to 164 lb |
| 5 ft 10 in | 129 to 174 lb |
| 6 ft 0 in | 136 to 184 lb |
| 6 ft 2 in | 144 to 194 lb |
| 6 ft 4 in | 152 to 205 lb |
| 155 cm | 44.4 to 59.8 kg |
| 160 cm | 47.4 to 63.7 kg |
| 165 cm | 50.4 to 67.8 kg |
| 170 cm | 53.5 to 72 kg |
| 175 cm | 56.7 to 76.3 kg |
| 180 cm | 59.9 to 80.7 kg |
| 185 cm | 63.3 to 85.2 kg |
| 190 cm | 66.8 to 89.9 kg |
How to use it
- Choose metric or imperial units.
- Enter your height and weight.
- Read the BMI value and the WHO category it falls into.
Frequently asked questions
What are the standard categories?
The WHO ranges for adults: under 18.5 underweight, 18.5 to 24.9 normal, 25 to 29.9 overweight, 30 and above obese. They are not intended for children, pregnant women or highly muscular people.
How reliable is BMI?
As a population statistic it is useful. For one person it is crude, because it cannot distinguish muscle from fat or account for frame size and fat distribution. Waist measurement and body composition tell you more.
Is this medical advice?
No. It is a calculator that applies a published formula. Any decision about your health belongs with a qualified professional who knows your circumstances.