QuickFnd Calculator
BMI Calculator
Calculate body mass index from your height and weight.
BMI Calculator
About BMI Calculator
BMI Calculator computes your Body Mass Index from height and weight using the standard WHO formula. Enter your measurements in metric or imperial units and instantly see your BMI value and standard classification range.
Why use BMI Calculator?
- Get your BMI instantly in both metric (kg/m²) and imperial (lbs/inches) units.
- See your result classification: Underweight, Normal weight, Overweight, or Obese.
- Clear range chart shows exactly where your result falls relative to WHO thresholds.
- No account needed — calculate privately in your browser.
How to use it
Select your unit system: Metric (kg and cm) or Imperial (lbs and inches).
Enter your height and weight in the input fields.
Click Calculate to see your BMI value and category instantly.
Review the range chart to understand where your result sits.
Best use cases
Getting a quick health screening number before a doctor's appointment
Tracking BMI changes over time as part of a fitness or weight management plan
Understanding BMI categories for health insurance or medical forms
Calculating BMI for family members using metric or imperial units
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Frequently asked questions
What is a healthy BMI range?
According to the WHO, a BMI of 18.5–24.9 is normal weight. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is obese. These thresholds may vary slightly by ethnicity and age.
Is BMI accurate for athletes?
No. BMI does not distinguish fat mass from muscle mass. Athletes often have high BMIs despite low body fat. BMI is a population screening tool, not a precise individual health measure.
What is the BMI formula?
BMI = weight(kg) / height(m)². In imperial: BMI = (weight in lbs × 703) / height in inches². Both give identical results when units are correctly converted.
Does BMI apply to children?
Child BMI is interpreted differently — compared against age and sex-specific growth charts rather than fixed thresholds. This calculator is designed for adults 18 and older.
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