Ideal Weight Calculator

by
Ideal Weight Calculator
MaleFemale
Devine (Standard)RobinsonMillerHamwi
Result:
Your Ideal Body Weight is approx.
kg
lbs
function calculateIdealWeight(){var gender=document.getElementById('gender').value;var ft=parseFloat(document.getElementById('heightFt').value)||0;var inc=parseFloat(document.getElementById('heightIn').value)||0;var formula=document.getElementById('formula').value;var showSteps=document.getElementById('showSteps').checked;if(ft<0||inc<0){alert('Please enter valid height');return;}var totalInches=(ft*12)+inc;var inchesOver60=totalInches-60;var ibw=0;var stepsText="";if(gender==='male'){if(formula==='devine'){ibw=50.0+(2.3*inchesOver60);stepsText="Devine Formula (Male): 50kg + 2.3kg per inch over 5ft";}else if(formula==='robinson'){ibw=52.0+(1.9*inchesOver60);stepsText="Robinson Formula (Male): 52kg + 1.9kg per inch over 5ft";}else if(formula==='miller'){ibw=56.2+(1.41*inchesOver60);stepsText="Miller Formula (Male): 56.2kg + 1.41kg per inch over 5ft";}else{ibw=48.0+(2.7*inchesOver60);stepsText="Hamwi Formula (Male): 48kg + 2.7kg per inch over 5ft";}}else{if(formula==='devine'){ibw=45.5+(2.3*inchesOver60);stepsText="Devine Formula (Female): 45.5kg + 2.3kg per inch over 5ft";}else if(formula==='robinson'){ibw=49.0+(1.7*inchesOver60);stepsText="Robinson Formula (Female): 49kg + 1.7kg per inch over 5ft";}else if(formula==='miller'){ibw=53.1+(1.36*inchesOver60);stepsText="Miller Formula (Female): 53.1kg + 1.36kg per inch over 5ft";}else{ibw=45.5+(2.2*inchesOver60);stepsText="Hamwi Formula (Female): 45.5kg + 2.2kg per inch over 5ft";}}if(totalInches<60){ibw=(gender==='male')?50:45.5;}var lbs=ibw*2.20462;document.getElementById('kgValue').innerHTML=ibw.toFixed(1);document.getElementById('lbValue').innerHTML='('+lbs.toFixed(1)+' lbs)';document.getElementById('answer').style.display='block';if(showSteps){document.getElementById('stepsOutput').style.display='block';document.getElementById('stepsOutput').innerHTML='Calculation Method:
'+stepsText+'
Height used: '+totalInches+' inches ('+inchesOver60+' inches over 5ft baseline).';}else{document.getElementById('stepsOutput').style.display='none';}}

How to Use the Ideal Weight Calculator

The ideal weight calculator is a tool designed to help you determine an estimated healthy body weight based on your biological gender, height, and established medical formulas. While "ideal weight" is subjective and can vary based on muscle mass and bone density, these formulas provide a clinical baseline used by healthcare professionals to estimate medication dosages and general health targets.

To find your result, simply follow these steps:

Biological Gender
Choose between Male or Female. Formulas differ significantly between genders because males typically have higher muscle mass and bone density.
Height (Feet & Inches)
Enter your total height. Most formulas use 5 feet (60 inches) as the base height for calculation.
Formula Selection
Select from the Devine, Robinson, Miller, or Hamwi formulas. The Devine formula is the most commonly used in clinical settings.

How the Calculations Work

When you use an ideal weight calculator, it applies one of several mathematical equations developed in the 20th century. Most of these formulas start with a base weight for a person who is exactly 5 feet tall and add a specific amount of weight for every inch above that height. The standard formula used by this calculator is the Devine Formula:

IBW (Male) = 50kg + 2.3kg × (inches over 5ft)
IBW (Female) = 45.5kg + 2.3kg × (inches over 5ft)

  • Base Weight: The starting point (50kg for men, 45.5kg for women).
  • Inches over 5ft: The total height in inches minus 60 inches.
  • Incremental Factor: The additional weight added per inch (typically 2.3kg).

Ideal Weight Calculation Example

Scenario: Let's calculate the ideal weight for a male who is 5 feet 10 inches tall using the Devine Formula.

Step-by-step solution:

  1. Determine gender: Male (Base = 50 kg)
  2. Convert height to total inches: 5'10" = 70 inches.
  3. Calculate inches over 5 feet: 70 – 60 = 10 inches.
  4. Calculate additional weight: 10 inches × 2.3 kg = 23 kg.
  5. Total Ideal Body Weight: 50 kg + 23 kg = 73 kg.
  6. Convert to pounds: 73 kg × 2.20462 = 160.9 lbs.

Common Questions about Ideal Weight

Is this calculator accurate for athletes?

Not necessarily. The ideal weight calculator does not take body composition into account. Athletes with high muscle mass may find their "ideal weight" according to these formulas is much lower than their actual healthy weight, as muscle is denser than fat.

What is the difference between BMI and IBW?

BMI (Body Mass Index) measures your weight relative to your height to categorize you into groups like "Underweight" or "Overweight." IBW (Ideal Body Weight) seeks to find a specific target weight that is considered optimal for health based on historical medical data.

Which formula is the most accurate?

There is no single "most accurate" formula. The Devine formula is widely used in clinical pharmacology for drug dosing, while the Hamwi formula is popular in nutrition and dietetics. Most people find their results are within a few pounds of each other across all four methods.

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