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Calculate your Body Mass Index and find out your health weight category instantly.
A BMI calculator gives you a quick read on where your weight sits compared to your height, using the same body mass index formula doctors and fitness apps rely on. You just punch in your weight and height — in kg/cm or lbs/in, whichever you're used to — and it tells you instantly if you're underweight, in the normal range, overweight, or in the obese category. People check this before starting a diet, after a health checkup, or just out of curiosity when they haven't weighed themselves in a while. It's not a diagnosis, just a fast screening number.
Most people don't want to manually work out weight divided by height squared, especially with the unit conversion for imperial measurements. This tool exists so you don't have to remember the formula or open a spreadsheet — enter two numbers, get your answer in a second. It also helps because a raw BMI number (like 23.4) doesn't mean much on its own until you see which category it falls into.
Behind the scenes it's a straightforward formula: weight in kilograms divided by height in meters squared. If you're using pounds and inches, the tool applies the 703 multiplier automatically so you get the same result without doing the math yourself. Say someone is 70kg and 175cm tall — the calculator divides 70 by 1.75² and returns a BMI of roughly 22.9, which lands in the normal weight range.
BMI stands for Body Mass Index. It's calculated as weight (kg) divided by height (m) squared. For pounds and inches, it's (weight ÷ height²) × 703.
It's a good general screening tool but not perfect. Athletes with high muscle mass can show a higher BMI without extra body fat, and it doesn't tell the full story for older adults or pregnant women.
For most adults, 18.5 to 24.9 is considered the normal range. Below 18.5 is underweight, 25–29.9 is overweight, and 30 and above falls into the obese category.
This version is built for adults 18 and older. Kids and teens need age- and gender-specific percentile charts instead of a flat BMI number.
No — it only uses weight and height. It doesn't separate muscle from fat, so two people with the same BMI can look very different physically.
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