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BMI Calculator - Body Mass Index & Healthy Weight Range

Calculate Body Mass Index (BMI), category, and healthy weight range for metric and imperial units.

Direct Overview & Capability:Numvax BMI Calculator calculates Body Mass Index (BMI) in both Metric (kg, cm) and Imperial (lbs, feet-inches) units. It displays an interactive multi-zone gauge, health category classification (Underweight, Normal, Overweight, Obese), range indicators, and target healthy weight ranges.

About the BMI Calculator - Body Mass Index & Healthy Weight Range

Body Mass Index (BMI) is a standardized statistical measure comparing an individual weight to height to categorize body composition into Underweight (<18.5), Normal (18.5-24.9), Overweight (25-29.9), and Obese (≥30).

What Can You Use This Calculator For?

This BMI calculator can be used by fitness enthusiasts, healthcare advisors, athletes, and individuals to evaluate whether their weight falls within the medically recognized healthy range for their height, estimate target goal weights, and track long-term wellness progress.

Standard World Health Organization (WHO) BMI Formulas

Metric Formula: BMI = weight (kg) / [height (m)]² Imperial Formula: BMI = [weight (lbs) / [height (in)]²] × 703

Worked Step-by-Step Examples

Metric Calculation (70 kg, 1.75 m)

Height in meters squared = 1.75 × 1.75 = 3.0625 m² BMI = 70 / 3.0625 = 22.86 (Normal weight)

Imperial Calculation (154 lbs, 5 ft 9 in = 69 in)

Height in inches squared = 69 × 69 = 4,761 in² BMI = (154 / 4,761) × 703 = 0.032346 × 703 = 22.74 (Normal weight)

Frequently Asked Questions

What is considered a healthy BMI for adults?
According to the World Health Organization (WHO), a healthy adult BMI falls between 18.5 and 24.9. A score below 18.5 is categorized as underweight, 25.0 to 29.9 as overweight, and 30.0 or higher as obese.
Does BMI apply accurately to athletes and bodybuilders?
BMI measures total body mass relative to height without distinguishing between lean muscle and fat tissue. High-performance athletes and weightlifters often score in the "overweight" or "obese" categories due to dense muscle mass despite having very low body fat percentages.
How do I convert my height in feet and inches into total inches for BMI?
Multiply the number of feet by 12 and add the remaining inches. For example, 5 feet 9 inches equals (5 × 12) + 9 = 69 total inches.
What is the healthy weight range for my height?
A healthy weight range corresponds to a BMI between 18.5 and 24.9. You can calculate your minimum healthy weight with: 18.5 × (height in meters)² and maximum healthy weight with: 24.9 × (height in meters)²
Is BMI calculated differently for men and women?
The standard adult BMI formula is identical for men and women. However, women typically have higher body fat percentages than men at the same BMI score.

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