Is your weight healthy for your height? The Body Mass Index (BMI) is the most widely used screening method by doctors and fitness trainers to assess weight categories. It helps identify if you are underweight, normal weight, overweight, or obese.
Our smart tool works with both Imperial (US) and Metric units. Simply enter your weight and height to get your score instantly.
It’s a simple ratio.
The formula is your weight divided by the square of your height.
In metric, it’s kg/m². In the US imperial system, the formula is (lbs x 703) / inches².
Our calculator handles this math for you automatically.
Between 18.5 and 24.9.
According to the World Health Organization (WHO), falling within this range suggests you have a healthy weight-to-height ratio.
Below 18.5 is considered underweight, and above 25 starts the overweight category.
Not always. BMI does not distinguish between muscle mass and body fat.
A bodybuilder with high muscle mass might be classified as “Obese” despite having very low body fat.
Use this tool as a general screening guideline, not a perfect health diagnosis.
Yes. While the standard BMI scale applies to adults (20+), interpretation varies for children, teens, and the elderly.
Older adults may benefit from having a slightly higher BMI to protect against frailty and osteoporosis.
1. Dual Unit Support:
We built this for everyone. Whether you measure in Kilograms and Centimeters (Global) or Pounds and Feet/Inches (USA/UK), you can switch modes instantly with a single click without reloading the page.
2. Visual Health Scale:
Don’t just see a number. Our tool features a color-coded gradient bar that visually places your result on the spectrum from Blue (Underweight) to Purple (Obesity Class III), making it easy to understand your status at a glance.
3. Smart Height Helper:
Inches can be confusing. When using the US mode, if you enter “70 inches”, our tool automatically displays “5′ 10″” right below the slider, so you don’t have to do mental math to figure out your height.
💡 Pro Tip: Your BMI is just one number. For a complete health picture, measure your Waist Circumference as well. Carrying excess weight around your midsection is a higher risk factor for heart disease than weight carried on hips or thighs.