BMI Calculator

cm
kg

Your BMI

0
Under
(<18.5)
Normal
(18.5-24.9)
Over
(25-29.9)
Obese I
(30-34.9)
Obese II+
(≥35)

BMI Prime: 0

Ponderal Index: 0 kg/m³

Health Information

:

Healthy Weight Range

for your height

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BMI Tips

  • Maintain BMI below 25 for optimal health
  • Consult a doctor for personalized weight advice
  • BMI may not reflect muscle mass in athletes
  • Use BMI with other measures for accuracy

About BMI

Body Mass Index (BMI) is a measure that uses height and weight to determine if your weight is in a healthy range.

Formula: BMI = weight (kg) / height (m)²

BMI Calculator: What It Measures

Body Mass Index (BMI) estimates body weight relative to height. It is a quick screening tool to classify weight status for adults. This calculator uses standard BMI math and also shows BMI Prime, Ponderal Index, and a healthy weight range for your height.

BMI Formula and Example

Formula: BMI = weight (kg) / height (m)²

Example: Height 1.70 m, weight 68 kg → BMI = 68 / (1.7 × 1.7) = 23.5

BMI Categories (Adults)

  • Underweight: < 18.5
  • Normal weight: 18.5 – 24.9
  • Overweight: 25 – 29.9
  • Obesity class I: 30 – 34.9
  • Obesity class II+: ≥ 35

Note: BMI categories can vary for children and some populations. This calculator is intended for adults.

Limitations of BMI

BMI does not directly measure body fat or muscle mass. Athletes or muscular individuals can have higher BMI without excess fat. For a fuller picture, compare BMI with body fat percentage and lifestyle factors.

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FAQs – BMI Calculator

Is BMI accurate for everyone?

BMI is a useful screening tool for adults, but it can be misleading for athletes, older adults, or people with high muscle mass. Use it alongside other measurements.

What is a healthy BMI range?

For most adults, a BMI between 18.5 and 24.9 is considered a healthy range.

Does BMI work for teens or children?

No. Children and teens should use age- and sex-specific BMI percentiles. This calculator is intended for adults.

What is BMI Prime?

BMI Prime is your BMI divided by 25. A value of 1.0 corresponds to a BMI of 25.

How do I improve my BMI?

Focus on consistent nutrition, activity, and sleep habits. Use the TDEE Calculator to estimate daily calories.