Calculator 4

Professional BMI Calculator

Your Results

function calculateBMI() { var weight = parseFloat(document.getElementById('bmiWeight').value); var heightCm = parseFloat(document.getElementById('bmiHeight').value); var resultWrapper = document.getElementById('bmiResultWrapper'); var valueDisplay = document.getElementById('bmiValueDisplay'); var categoryDisplay = document.getElementById('bmiCategoryDisplay'); var rangeInfo = document.getElementById('bmiRangeInfo'); if (isNaN(weight) || isNaN(heightCm) || weight <= 0 || heightCm <= 0) { alert('Please enter valid positive numbers for weight and height.'); return; } var heightM = heightCm / 100; var bmi = weight / (heightM * heightM); var roundedBMI = bmi.toFixed(1); resultWrapper.style.display = 'block'; valueDisplay.innerHTML = roundedBMI; var category = ''; var color = ''; if (bmi = 18.5 && bmi = 25 && bmi < 29.9) { category = 'Overweight'; color = '#f39c12'; } else { category = 'Obese'; color = '#e74c3c'; } categoryDisplay.innerHTML = 'Category: ' + category; categoryDisplay.style.color = color; valueDisplay.style.color = color; var minHealthy = (18.5 * (heightM * heightM)).toFixed(1); var maxHealthy = (24.9 * (heightM * heightM)).toFixed(1); rangeInfo.innerHTML = 'For your height, a healthy weight range is between ' + minHealthy + 'kg and ' + maxHealthy + 'kg.'; resultWrapper.scrollIntoView({ behavior: 'smooth', block: 'nearest' }); }

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Understanding Your BMI Results

Body Mass Index (BMI) is a widely recognized screening tool used to categorize an individual's body weight relative to their height. It provides a simple numeric value that helps healthcare professionals identify potential weight-related health risks.

How BMI is Calculated

The BMI formula is straightforward: your weight in kilograms divided by the square of your height in meters. While it does not directly measure body fat, it serves as a reliable proxy for the majority of the population.

• Formula: BMI = kg/m²

Standard BMI Categories

BMI Range	Classification
Below 18.5	Underweight
18.5 – 24.9	Healthy Weight
25.0 – 29.9	Overweight
30.0 and Above	Obese

Practical Examples

Consider these two scenarios to see how height significantly impacts the BMI classification:

• Example 1: An individual weighing 85kg at a height of 180cm has a BMI of 26.2, which falls into the Overweight category.
• Example 2: An individual weighing 85kg but at a height of 195cm has a BMI of 22.4, which is considered a Healthy Weight.

Is BMI Always Accurate?

While BMI is a helpful starting point, it has limitations. It does not distinguish between muscle mass and body fat. For instance, high-performance athletes or bodybuilders may have a high BMI due to increased muscle mass rather than high body fat. Conversely, older adults who have lost muscle mass may appear to have a "healthy" BMI despite having excess body fat. Always consult with a medical professional for a comprehensive health assessment.