🧰 Lanren Toolkit

⚖️ BMI Calculator

Enter your height and weight to instantly calculate your BMI, see your weight category, and get your healthy weight range.

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📖 How to Use

  1. Enter your height in centimeters (cm), e.g. 170.
  2. Enter your weight in kilograms (kg), e.g. 65.
  3. The result updates automatically as you type — no button to click.
  4. Read the result: the big number at the top is your BMI. Below it you'll see your weight category (Underweight, Healthy weight, Overweight, or one of the Obese classes), color-coded for a quick read (blue = low, green = healthy, orange/red = high).
  5. Healthy weight range: the table shows the kilogram range that corresponds to a BMI of 18.5–24 at your current height, which you can use as a rough target range.
Note: BMI is a rough height-to-weight ratio and doesn't account for body fat percentage or muscle mass (someone with high muscle mass may show a higher BMI despite low body fat). For a more precise health assessment, consider a body-fat measurement or consult a healthcare professional.
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