BMI Calculator

Calculate your Body Mass Index (BMI) to measure body fat based on height and weight.

Your BMI is

22.5

Normal

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BMI Categories

BMI Range Category
Less than 18.5 Underweight
18.5 - 24.9 Normal Weight
25 - 29.9 Overweight
30 or greater Obese

BMI Calculator — Free Online Body Mass Index Tool

The BMI Calculator is a simple health tool used to verify if you are in a healthy weight range for your height. By inputting your weight and height, the tool calculates your BMI score and categorizes it as Underweight, Normal, Overweight, or Obese based on World Health Organization (WHO) standards.

Key Features

  • Free Forever: No subscription or payment required
  • No Signup: Use instantly without creating an account
  • Metric & Imperial: Supports kg/cm and lbs/inches
  • WHO Categories: Results interpreted per WHO health standards
  • Private: All calculations happen locally — no data stored

Frequently Asked Questions

According to WHO standards: Below 18.5 is Underweight. 18.5–24.9 is Normal (healthy). 25.0–29.9 is Overweight. 30.0 and above is Obese. A BMI between 18.5 and 24.9 is considered healthy for most adults.

BMI is calculated as: weight (kg) ÷ height² (m²). For example, a person weighing 70kg at 1.75m tall has a BMI of 70 ÷ (1.75 × 1.75) = 22.9, which is Normal. Our calculator handles this instantly for both metric and imperial units.

BMI is a general population-level indicator. It does not account for muscle mass, so athletes and bodybuilders may have a high BMI despite low body fat. It also may not accurately reflect health risks for older adults or children. Always consult a doctor for personal health guidance.

Yes. Our BMI calculator supports both metric (kilograms and centimetres) and imperial (pounds and inches/feet) input, so you can use whichever unit system you prefer.

No. All BMI calculations happen locally in your browser. Your height, weight, and results are never sent to our servers, stored, or shared.

BMI (Body Mass Index) is a ratio of weight to height squared — it is a simple estimate of body composition. Body fat percentage measures the actual proportion of fat mass versus total mass. BMI is a quick screening tool, while body fat percentage requires specialized equipment (DEXA scan, calipers, or bioelectrical impedance) for accurate measurement.

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