Optimal Weight Calculator

Optimal Weight Calculator

Male Female

Your Ideal Weight Results

Based on the most recognized medical formulas, your optimal weight estimates are:

Devine Formula

–

Robinson Formula

–

Miller Formula

–

Hamwi Formula

–

Healthy BMI Range (18.5 – 24.9): –

function calculateOptimalWeight() { var gender = document.getElementById("calcGender").value; var feet = parseFloat(document.getElementById("calcFeet").value); var inches = parseFloat(document.getElementById("calcInches").value); if (isNaN(feet) || isNaN(inches)) { alert("Please enter valid height values."); return; } var totalInches = (feet * 12) + inches; var inchesOver5ft = Math.max(0, totalInches – 60); var devine, robinson, miller, hamwi; var bmiMin, bmiMax; // BMI Calculations (based on height in meters) var heightMeters = totalInches * 0.0254; bmiMin = (18.5 * (heightMeters * heightMeters)) * 2.20462; bmiMax = (24.9 * (heightMeters * heightMeters)) * 2.20462; if (gender === "male") { devine = 50 + (2.3 * inchesOver5ft); robinson = 52 + (1.9 * inchesOver5ft); miller = 56.2 + (1.41 * inchesOver5ft); hamwi = 48 + (2.7 * inchesOver5ft); } else { devine = 45.5 + (2.3 * inchesOver5ft); robinson = 49 + (1.7 * inchesOver5ft); miller = 53.1 + (1.36 * inchesOver5ft); hamwi = 45.5 + (2.2 * inchesOver5ft); } // Convert KG results to LBS var dLbs = devine * 2.20462; var rLbs = robinson * 2.20462; var mLbs = miller * 2.20462; var hLbs = hamwi * 2.20462; document.getElementById("resDevine").innerText = dLbs.toFixed(1) + " lbs"; document.getElementById("resRobinson").innerText = rLbs.toFixed(1) + " lbs"; document.getElementById("resMiller").innerText = mLbs.toFixed(1) + " lbs"; document.getElementById("resHamwi").innerText = hLbs.toFixed(1) + " lbs"; document.getElementById("resBMIRange").innerText = bmiMin.toFixed(1) + " lbs – " + bmiMax.toFixed(1) + " lbs"; document.getElementById("weightResultArea").style.display = "block"; }

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Understanding Optimal Weight: Formulas and Health

Optimal body weight (often referred to as Ideal Body Weight or IBW) is a statistical estimate of a healthy weight based on your height and biological gender. While "ideal" weight is subjective and depends on muscle mass, bone density, and body composition, medical professionals use specific formulas to establish a healthy baseline for clinical purposes.

The Popular Weight Formulas Explained

Our calculator utilizes four of the most historically significant and clinically utilized formulas in the medical field:

• Devine Formula (1974): Originally developed to calculate dosages for medications like digoxin. It remains the most widely used formula in clinical settings today.
• Robinson Formula (1983): A modification of the Devine formula intended to provide more accurate estimates for men.
• Miller Formula (1983): Another modification of the Devine formula, often used to calculate a more conservative weight range for women.
• Hamwi Formula (1964): One of the earliest formulas, commonly used by dietitians to find a baseline for nutritional planning.

Calculating Your BMI-Based Healthy Range

While the formulas above provide a specific number, health is usually better measured as a range. The Body Mass Index (BMI) range for a healthy adult is typically considered to be between 18.5 and 24.9. Our calculator provides this range based on your specific height, which many healthcare providers prefer over a single "ideal" number.

Example Calculation

If you are a 5'10" male, the calculation looks like this:

• Height: 70 inches (10 inches over 5 feet).
• Devine Formula: 50kg + (2.3kg × 10) = 73kg (approx. 161 lbs).
• Healthy BMI Range: Approx. 129 lbs to 174 lbs.

Limitations of Optimal Weight Calculators

It is crucial to remember that these formulas have limitations. They do not distinguish between fat and muscle. An athlete with high muscle mass may be "overweight" according to these formulas while having very low body fat. Always consult with a healthcare professional or a registered dietitian to determine the most appropriate weight goals for your specific body type and lifestyle.