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Your Health Metrics
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This calculator provides a basic health assessment. Always consult a healthcare professional for personalized advice.
Understanding Your Health & Wellness Metrics
Maintaining good health is a cornerstone of a fulfilling life. This calculator helps you understand key indicators of your general well-being based on your weight, height, age, and gender. While it's not a substitute for professional medical advice, it offers a starting point for assessing your current health status and identifying areas for potential improvement.
Body Mass Index (BMI)
BMI is a widely used metric to categorize a person's weight relative to their height. It helps to broadly classify individuals into underweight, normal weight, overweight, or obese categories.
Formula: BMI = (Weight in kilograms) / (Height in meters)²
To use the formula with your input (height in cm):
Revised Formula: BMI = (Weight in kg) / ( (Height in cm) / 100 )²
BMI Categories:
Below 18.5: Underweight
18.5 – 24.9: Normal weight
25.0 – 29.9: Overweight
30.0 and above: Obese
Basal Metabolic Rate (BMR)
BMR represents the number of calories your body needs to perform basic life-sustaining functions at rest, such as breathing, circulation, and cell production. It's the minimum energy expenditure required to keep your body alive. The calculation often uses the Mifflin-St Jeor equation, which is considered more accurate than older formulas.
Mifflin-St Jeor Equation:
For men: BMR = (10 × weight in kg) + (6.25 × height in cm) – (5 × age in years) + 5
For women: BMR = (10 × weight in kg) + (6.25 × height in cm) – (5 × age in years) – 161
Uses and Considerations
Health Monitoring: Track changes in your BMI over time.
Fitness Goals: Understand your caloric needs for weight management.
General Awareness: Gain insights into how your body metrics relate to general health guidelines.
Important Note: BMI does not distinguish between muscle and fat mass. Athletes or individuals with significant muscle mass might have a high BMI without being unhealthy. Similarly, age and gender play roles in metabolism and body composition. This calculator provides an estimation, and a healthcare professional can offer a comprehensive evaluation.
function calculateHealthMetrics() {
var weight = parseFloat(document.getElementById("weight").value);
var heightCm = parseFloat(document.getElementById("height").value);
var age = parseFloat(document.getElementById("age").value);
var gender = document.getElementById("gender").value;
var resultOutput = document.getElementById("result-output");
resultOutput.innerHTML = "–"; // Clear previous results
// — Input Validation —
if (isNaN(weight) || weight <= 0) {
resultOutput.innerHTML = "Please enter a valid weight.";
return;
}
if (isNaN(heightCm) || heightCm <= 0) {
resultOutput.innerHTML = "Please enter a valid height.";
return;
}
if (isNaN(age) || age <= 0) {
resultOutput.innerHTML = "Please enter a valid age.";
return;
}
// — BMI Calculation —
var heightM = heightCm / 100; // Convert cm to meters
var bmi = weight / (heightM * heightM);
var bmiCategory = "";
if (bmi = 18.5 && bmi = 25 && bmi = 30) {
bmiCategory = "Obese";
}
// — BMR Calculation (Mifflin-St Jeor Equation) —
var bmr = 0;
if (gender === "male") {
bmr = (10 * weight) + (6.25 * heightCm) – (5 * age) + 5;
} else if (gender === "female") {
bmr = (10 * weight) + (6.25 * heightCm) – (5 * age) – 161;
} else { // Other/Prefer not to say – use a neutral approach or prompt for more info
// For simplicity, we can average male and female or just state it's not applicable without gender
// Here, we'll use a placeholder or a simplified calculation, or just omit BMR for 'other'
// Let's calculate using a general approach, though less precise
bmr = ( (10 * weight) + (6.25 * heightCm) – (5 * age) + 5 + (10 * weight) + (6.25 * heightCm) – (5 * age) – 161 ) / 2;
// Or better, inform user:
// bmr = "N/A (Gender not specified)";
}
var resultText = "BMI: " + bmi.toFixed(2) + " (" + bmiCategory + ")";
if (typeof bmr === 'number') {
resultText += "Estimated BMR: " + bmr.toFixed(0) + " calories/day";
} else {
resultText += "Estimated BMR: " + bmr; // Display "N/A" if calculated as such
}
resultOutput.innerHTML = resultText;
}