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How to Use
- 1Select your preferred unit system: metric (cm/kg) or imperial (ft-in/lbs) using the toggle.
- 2Enter your height and weight in the selected units.
- 3Read your BMI value and find your position on the colored gauge — the green zone (18.5–24.9) represents normal weight.
- 4Note your BMI category: Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), or Obese (30 and above).
- 5Keep in mind that BMI is a screening tool only. Athletes and muscular individuals may score as overweight despite having low body fat — consult a healthcare professional for a complete assessment.
About BMI Calculator
The BMI Calculator computes your Body Mass Index from height and weight using the standard formula: weight (kg) ÷ height (m)². Supports both metric (cm/kg) and imperial (ft-in/lbs) units with a colored gauge that shows where you fall across WHO-defined categories.
BMI categories: below 18.5 is underweight, 18.5–24.9 is normal weight, 25–29.9 is overweight, and 30+ is obese. The visual gauge makes it easy to see your result relative to each range without interpreting numbers.
While BMI is the most widely used screening metric in clinical and public health settings, it does not distinguish between muscle and fat mass. Athletes or muscular individuals may score as 'overweight' despite having low body fat. For a complete assessment, consult a healthcare professional.
All calculations run locally in your browser. No personal health data is transmitted or stored anywhere.
Frequently Asked Questions
What is BMI and how is it calculated?
BMI (Body Mass Index) equals your weight in kilograms divided by your height in meters squared (kg/m²). It is a quick screening tool to categorize weight status.
What are the BMI categories?
Underweight: below 18.5. Normal weight: 18.5–24.9. Overweight: 25–29.9. Obese: 30 and above. These ranges are defined by the World Health Organization.
Is BMI accurate for athletes and muscular people?
Not always. BMI does not distinguish between muscle and fat, so muscular individuals may be classified as overweight despite having low body fat. It is a screening tool, not a diagnosis.
Does this work with imperial units (feet and pounds)?
Yes. Toggle to imperial mode and enter your height in feet/inches and weight in pounds. The calculator converts to metric internally for the BMI formula.
Is my health data stored or shared?
No. All calculations happen locally in your browser. No health data is transmitted to any server or stored anywhere.