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BMI Calculator

Calculate your Body Mass Index quickly and easily.

Enter your height and weight to calculate your BMI.
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About Body Mass Index (BMI)

BMI, or Body Mass Index, is a standard health screening calculation used by healthcare providers to estimate body fat relative to height and weight.

BMI Categories Reference

BMI Scale Category Classification
Below 18.5 Underweight
18.5 – 24.9 Normal weight
25 – 29.9 Overweight
30 and above Obesity

How is BMI calculated?

For metric measurements, BMI is calculated by dividing your weight in kilograms by your height in meters squared.

BMI Formula (Metric): weight (kg) ÷ [height (m)]²

Frequently Asked Questions

Is this BMI calculator free?

Yes. The calculator is 100% free to use and processes all calculations instantly directly in your browser.

Can I use pounds and feet?

Yes. Select Imperial from the unit selector dropdown and enter your weight in pounds and height in feet/inches.

Is BMI a definitive medical diagnosis?

No. BMI is a general screening indicator and does not replace professional medical evaluations, body fat percentages, or muscular composition analysis.

How the BMI Calculator Works

Enter your weight and height, choose the measurement system, and the calculator converts the values when needed before calculating your Body Mass Index.

Formula

Calculation formula BMI = Weight (kg) ÷ [Height (m)]². For imperial measurements, the equivalent formula is BMI = 703 × Weight (lb) ÷ [Height (in)]².

Instructions

  1. Enter your current weight.
  2. Select Metric or Imperial units and enter your height.
  3. Click Calculate BMI to see your BMI and category.
  4. BMI is a screening measure and should not be treated as a medical diagnosis.