BMI Calculator

Enter your height and weight — supports ft/in or cm, and kg or lbs. Results include BMI value, classification, healthy weight range, BMI Prime and Ponderal Index, plus an animated premium gauge.

Height Choose one unit system
Weight Choose one unit

Your BMI

— kg/m²
Enter values to calculate BMI.
Healthy BMI range
18.5 – 25
Healthy weight for height
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BMI Prime
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Ponderal Index
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BMI Gauge

BMI = —
Underweight Normal Overweight Obese

What Is Body Mass Index (BMI)?

Body Mass Index (BMI) is a globally used screening tool that compares weight and height to determine whether an individual falls within a healthy weight range.

How This Calculator Works

Enter your height and weight in any supported units, and the tool calculates BMI instantly, displays your health classification, and gives additional metrics such as healthy weight range, BMI Prime, and Ponderal Index.

BMI Categories

  • < 18.5: Underweight
  • 18.5 – 24.9: Normal
  • 25 – 29.9: Overweight
  • ≥ 30: Obese

Limitations of BMI

BMI does not differentiate between muscle and fat. It may misclassify athletes, older adults, pregnant individuals, or people with high muscle mass.

Frequently Asked Questions (FAQs)

BMI is a simple screening tool that compares your weight to your height to estimate body fat levels.
BMI is helpful, but it should be paired with waist circumference and body fat measurements for accurate health evaluation.
Muscle weighs more than fat, so athletes often have a higher BMI despite having low body fat.
For most adults, a BMI between 18.5 and 24.9 is considered healthy.
Yes — BMI may be inaccurate for athletes, seniors, pregnant women, or people with high muscle mass.
No. BMI estimates body fat using height and weight, but does not directly measure fat percentage.
Healthy eating, regular exercise, good sleep, and reducing stress can gradually lower BMI.
A BMI below 18.5 may indicate underweight, which can increase risks like weak immunity and nutrient deficiency.
No — children and teens use age- and sex-specific BMI percentiles.
Small deviations are not always concerning; a doctor can assess the full health context.