BMI Calculator

Calculate your Body Mass Index (BMI) using height and weight. Provides BMI category and healthy weight range.

Scratchpad (not saved)

Weight
imperial
lb
metric
kg
Height
imperial
ft
in
metric
cm

What This Calculator Does

Compute body mass index from height and weight to quickly classify weight status using standard BMI category thresholds.

It combines Weight, Height (feet), Height (inches) to estimate BMI, Category, Healthy Weight Range.

Formula & Method

Imperial formula: BMI = (weight in pounds x 703) / (height in inches)^2. The same result in metric uses BMI = kg / m^2. Core relationship: R=f(x1,x2,x3)R = f\left(x_{1}, x_{2}, x_{3}\right) where RR is BMI.

Notation used in the formulas: RR = BMI; x1x_{1} = Weight; x2x_{2} = Height (feet); x3x_{3} = Height (inches).

Method summary: inputs are normalized to consistent units, core equations are evaluated, then secondary values are derived and rounded for display.

Use BMI as a broad screening metric for trend tracking. Combine it with other health markers for more complete decision-making.

Frequently Asked Questions

Is BMI a diagnosis tool?
No. BMI is a screening metric and should be interpreted alongside other clinical indicators.
Can BMI be useful for tracking trends?
Yes. Repeated BMI measurements can help you monitor directional changes over time.

Inputs Used

  • Weight: Your weight in pounds
  • Height (feet): Feet portion of your height
  • Height (inches): Inches portion of your height

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