BMI Calculator

At 28, my doctor said three words that changed how I thought about my health: "Let's check your BMI." I laughed — me, overweight? But the number didn't lie, and it started me on a healthier path. This BMI calculator gives you that same number in seconds.

Enter your height and weight to get your Body Mass Index and see which category you fall into.

⚖️ BMI Calculator

Body Mass Index — see if your weight is in a healthy range.

Your BMI0
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General guide only, not medical advice.

How to use this BMI calculator

  1. Enter your height in centimeters — for example, 170.
  2. Enter your weight in kilograms — for example, 70.
  3. Your BMI and category (Underweight, Healthy weight, Overweight, Obese) appear instantly.

Worked example

170 cm, 70 kg

Someone who is 170 cm tall and weighs 70 kg has a BMI of 24.2 — right in the healthy range (18.5–24.9). The formula is weight ÷ height², but you don't need to remember that — the calculator does it.

I'm not a doctor and this isn't medical advice — BMI is a screening guide, not a diagnosis. I wrote about what I learned (and BMI's real limitations) in my BMI calculator guide.

Frequently asked questions

What is a healthy BMI?

For most adults, 18.5–24.9 is considered the healthy range. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese. These are screening categories, not verdicts about your health.

Is BMI accurate?

It's a useful screening tool but it has limits — it can't tell muscle from fat, so athletes can score as “overweight” while being very fit. Think of it as one data point, not the whole picture.

How often should I check my BMI?

There's no need to check daily — weight fluctuates naturally. Once a month, or at regular checkups, is plenty. What matters most is the trend over time, not one number.

Does BMI work the same for everyone?

Mostly, but with caveats: it doesn't account for muscle mass, bone density, or where fat is stored. Older adults, athletes, and pregnant women should interpret results with a doctor's guidance.

One number won't define your health — but knowing it is a good start. Explore the other free tools on DailyToolsPro, like the in-depth BMI guide I wrote about my own experience.

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