Human Weight Calculator
body {
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button {
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}
Human Weight Calculator
Calculate your ideal or target weight based on different methods.
Male
Female
Body Mass Index (BMI)
Hamwi Formula
Devine Formula
Robinson Formula
Miller Formula
Your calculated weight will appear here.
Understanding Human Weight Calculation Methods
Maintaining a healthy weight is crucial for overall well-being. Various formulas and metrics exist to help individuals understand their weight in relation to their body composition and health goals. This calculator utilizes several popular methods to provide a range of target weights.
Body Mass Index (BMI)
BMI is a widely used measure that assesses body weight relative to height. It's calculated using the formula: BMI = weight (kg) / [height (m)]². While not a direct measure of body fat, it's a useful indicator for categorizing weight status. For the purpose of target weight calculation, we aim for a healthy BMI range, typically between 18.5 and 24.9.
The calculator uses the healthy BMI range to determine a target weight:
Target Weight (kg) = 18.5 * [height (m)]²
Target Weight (kg) = 24.9 * [height (m)]²
The result will show the range of weights corresponding to a healthy BMI.
Formula-Based Ideal Weight Calculations
Several physician-developed formulas estimate an ideal body weight based on height, gender, and sometimes age. These are often used as starting points and may not account for individual body composition (e.g., muscle mass vs. fat mass).
Hamwi Formula (1964)
This is one of the older and simpler formulas:
For men: 48 kg + 2.7 kg per inch over 5 feet.
For women: 45.5 kg + 2.2 kg per inch over 5 feet.
The calculator converts the input height to feet and inches to apply this formula.
Devine Formula (1974)
Another commonly cited formula:
For men: 50 kg + 2.3 kg per inch over 5 feet.
For women: 45.5 kg + 2.3 kg per inch over 5 feet.
Similar to Hamwi, height is converted to feet and inches.
Robinson Formula (1983)
This formula adjusted the weight for height:
For men: 52 kg + 1.9 kg per inch over 5 feet.
For women: 53.1 kg + 1.36 kg per inch over 5 feet.
Again, height is converted to feet and inches.
Miller Formula (1983)
A more recent iteration:
For men: 56.2 kg + 1.41 kg per inch over 5 feet.
For women: 53.1 kg + 1.36 kg per inch over 5 feet.
Height is converted to feet and inches for this calculation.
How to Use the Calculator
Enter your Age, Gender, and Height in centimeters.
Input your Current Weight in kilograms.
Select the desired Calculation Method from the dropdown.
Click the "Calculate Weight" button.
The calculator will display the target weight based on the chosen method. Remember that these are estimates, and individual health and body composition can vary significantly. Consulting a healthcare professional is always recommended for personalized advice.
function calculateWeight() {
var age = parseFloat(document.getElementById("age").value);
var gender = document.getElementById("gender").value;
var heightCm = parseFloat(document.getElementById("heightCm").value);
var weightKg = parseFloat(document.getElementById("weightKg").value);
var method = document.getElementById("calculationMethod").value;
var resultDiv = document.getElementById("result");
var calculatedWeight = null;
var resultText = "";
// Basic validation for required inputs
if (isNaN(heightCm) || heightCm <= 0) {
resultDiv.innerHTML = "Please enter a valid height (cm).";
return;
}
if (isNaN(age) || age <= 0) {
resultDiv.innerHTML = "Please enter a valid age.";
return;
}
if (isNaN(weightKg) || weightKg <= 0) {
resultDiv.innerHTML = "Please enter a valid current weight (kg).";
return;
}
// Convert height to meters for BMI
var heightM = heightCm / 100;
// Helper function to convert cm to feet and inches
function cmToFeetInches(cm) {
var totalInches = cm / 2.54;
var feet = Math.floor(totalInches / 12);
var inches = Math.round(totalInches % 12);
return { feet: feet, inches: inches, totalInches: totalInches };
}
var heightData = cmToFeetInches(heightCm);
var feet = heightData.feet;
var inches = heightData.inches;
var totalInches = heightData.totalInches;
if (method === "bmi") {
var minBmi = 18.5;
var maxBmi = 24.9;
var minWeight = minBmi * Math.pow(heightM, 2);
var maxWeight = maxBmi * Math.pow(heightM, 2);
calculatedWeight = { min: minWeight, max: maxWeight };
resultText = "Healthy Weight Range (BMI " + minBmi + "-" + maxBmi + "): " + minWeight.toFixed(1) + " – " + maxWeight.toFixed(1) + " kg";
} else if (method === "hamwi") {
var baseWeight = (gender === "male") ? 48 : 45.5;
var weightPerInch = (gender === "male") ? 2.7 : 2.2;
// Calculate inches over 5 feet (60 inches)
var inchesOver5Feet = totalInches – 60;
if (inchesOver5Feet < 0) inchesOver5Feet = 0; // Ensure it's not negative if shorter than 5 feet
calculatedWeight = baseWeight + (weightPerInch * inchesOver5Feet);
resultText = "Ideal Weight (Hamwi): " + calculatedWeight.toFixed(1) + " kg";
} else if (method === "devine") {
var baseWeight = (gender === "male") ? 50 : 45.5;
var weightPerInch = 2.3;
var inchesOver5Feet = totalInches – 60;
if (inchesOver5Feet < 0) inchesOver5Feet = 0;
calculatedWeight = baseWeight + (weightPerInch * inchesOver5Feet);
resultText = "Ideal Weight (Devine): " + calculatedWeight.toFixed(1) + " kg";
} else if (method === "robinson") {
var baseWeight = (gender === "male") ? 52 : 53.1;
var weightPerInch = (gender === "male") ? 1.9 : 1.36;
var inchesOver5Feet = totalInches – 60;
if (inchesOver5Feet < 0) inchesOver5Feet = 0;
calculatedWeight = baseWeight + (weightPerInch * inchesOver5Feet);
resultText = "Ideal Weight (Robinson): " + calculatedWeight.toFixed(1) + " kg";
} else if (method === "miller") {
var baseWeight = (gender === "male") ? 56.2 : 53.1;
var weightPerInch = (gender === "male") ? 1.41 : 1.36;
var inchesOver5Feet = totalInches – 60;
if (inchesOver5Feet < 0) inchesOver5Feet = 0;
calculatedWeight = baseWeight + (weightPerInch * inchesOver5Feet);
resultText = "Ideal Weight (Miller): " + calculatedWeight.toFixed(1) + " kg";
}
if (resultText) {
resultDiv.innerHTML = resultText;
} else {
resultDiv.innerHTML = "Calculation error. Please check your inputs.";
}
}