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BMI Calculator

Updated April 6, 2026 · Free Online Tool

BMI Calculator

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Formula: (weight / Math.pow(height / 100, 2))
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Calculate your Body Mass Index (BMI) instantly. Enter your weight and height to see where you fall on the BMI scale.

What Is BMI?

Body Mass Index is a screening tool that uses your weight and height to estimate body fat. The World Health Organization defines BMI categories as: Underweight (below 18.5), Normal weight (18.5-24.9), Overweight (25-29.9), and Obese (30 and above).

Frequently Asked Questions

Is BMI accurate for everyone?

BMI is a screening tool, not a diagnostic one. It may overestimate body fat in athletes with high muscle mass and underestimate it in older adults who have lost muscle. Always consult a healthcare provider for a complete health assessment.

What is a healthy BMI range?

A BMI between 18.5 and 24.9 is generally considered healthy for adults. However, optimal BMI can vary based on age, sex, ethnicity, and muscle mass.

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