Determining an "ideal weight" is not an exact science, as it depends on various factors including bone density, muscle mass, and overall body composition. However, health professionals often use formulas to provide a general guideline for a healthy weight range. This calculator for women provides an estimated ideal weight based on commonly used methods, taking into account height and frame size.
How the Calculation Works
This calculator primarily uses the following formula, which is a variation of the Devine formula adapted for women and includes frame size considerations:
Ideal Weight (kg) = [ (Height in cm – 150) / 2.54 ] * 0.453592 * 1.7 + 45.5
Where:
Height in cm: Your total height measured in centimeters.
(Height in cm – 150) / 2.54: Converts the height above 150 cm into inches.
* 0.453592: Converts the result to pounds.
* 1.7: A multiplier often used in weight estimation formulas.
+ 45.5: A baseline weight often used for women at 5 feet tall.
The Body Frame Size adjustment is applied as a multiplier to the initial calculation to account for differences in skeletal structure:
Small Frame: Multiplier of 1.0 (no adjustment or slight reduction).
Medium Frame: Multiplier of 1.1 (standard adjustment).
Large Frame: Multiplier of 1.2 (slight increase).
The final result is then presented in both kilograms (kg) and pounds (lbs).
Important Considerations
It's crucial to remember that this calculator provides an estimate. Factors such as muscle mass, pregnancy, age, and individual health conditions can significantly influence your body weight and health. This tool is intended for general informational purposes only and should not replace professional medical advice. Always consult with a healthcare provider or a registered dietitian for personalized health and weight management guidance.
function calculateIdealWeight() {
var heightCmInput = document.getElementById("heightCm");
var heightInchesInput = document.getElementById("heightInches");
var frameSizeSelect = document.getElementById("frameSize");
var resultDiv = document.getElementById("result");
var heightCm = parseFloat(heightCmInput.value);
var heightInches = parseFloat(heightInchesInput.value);
var frameSizeMultiplier = parseFloat(frameSizeSelect.value);
var totalHeightCm = 0;
// Prioritize cm input if available, otherwise use inches
if (!isNaN(heightCm) && heightCm > 0) {
totalHeightCm = heightCm;
} else if (!isNaN(heightInches) && heightInches > 0) {
totalHeightCm = heightInches * 2.54; // Convert inches to cm
} else {
resultDiv.innerHTML = "Please enter a valid height.";
return;
}
if (totalHeightCm 250) { // Reasonable height range in cm
resultDiv.innerHTML = "Height seems unrealistic. Please enter a valid height.";
return;
}
if (isNaN(frameSizeMultiplier) || frameSizeMultiplier <= 0) {
resultDiv.innerHTML = "Please select a valid frame size.";
return;
}
// Formula using height in cm
// This is a common estimation formula. Variations exist.
// Baseline: Approx 45.5 kg for 150 cm, with an increase for every 2.54 cm above that.
// Multiplier of 1.7 is a common factor for women's weight estimation.
var baseWeightKg = 45.5; // Weight at 150cm
var heightDifferenceCm = totalHeightCm – 150;
var inchesAbove150 = heightDifferenceCm / 2.54;
var weightIncreasePerInch = 0.453592 * 1.7; // Approx 1.7 lbs per inch
var estimatedWeightKg = baseWeightKg + (inchesAbove150 * weightIncreasePerInch);
// Apply frame size multiplier
estimatedWeightKg *= frameSizeMultiplier;
var estimatedWeightLbs = estimatedWeightKg * 2.20462;
resultDiv.innerHTML = "Ideal Weight Range: " +
estimatedWeightKg.toFixed(1) + " kg" +
" | " +
estimatedWeightLbs.toFixed(1) + " lbs";
}