Calculate My Ideal Weight in Kilograms: Precision Calculator and Guide
Use this professional tool to calculate my ideal weight in kilograms with medical-grade formulas and see how height, sex, and frame size shape healthy targets.
Ideal Weight Calculator (kg)
Enter your measured standing height in centimeters.
Male
Female
Sex determines the coefficient used by clinical ideal weight formulas.
Age helps contextualize realistic goals, even though formula math is height-driven.
Pick a BMI inside the healthy band to see its equivalent weight in kilograms.
Sedentary
Lightly Active
Moderately Active
Highly Active
Higher activity levels support the upper end of ideal weight in kilograms.
Ideal Weight: 0 kg
Devine Ideal Weight: — kg
Hamwi Ideal Weight: — kg
Robinson Ideal Weight: — kg
Miller Ideal Weight: — kg
Healthy BMI Range Weight: — kg
Key Assumptions: —
Formula: Average of four medical formulas adjusted for frame and activity.
Chart: Comparison of ideal weight formulas versus BMI targets.
Table: Ideal weight outputs by formula in kilograms.
Method
Calculation Detail
Ideal Weight (kg)
Devine
Uses sex and height in inches
—
Hamwi
Uses sex and height in inches
—
Robinson
Uses sex and height in inches
—
Miller
Uses sex and height in inches
—
BMI Target
Height and chosen BMI
—
What is calculate my ideal weight in kilograms?
Calculate my ideal weight in kilograms means translating your height, sex, frame, activity, and chosen BMI target into a practical goal you can act on. Anyone seeking to calculate my ideal weight in kilograms should use clinical formulas to avoid guesswork. A common misconception is that calculate my ideal weight in kilograms is the same for everyone of the same height; in reality, frame size and activity shift where you should land.
Athletes use calculate my ideal weight in kilograms to balance performance and health, while office workers use calculate my ideal weight in kilograms to set gradual milestones. Another misconception is that calculate my ideal weight in kilograms ignores age; while math is height-driven, age informs the safe pace to approach the target.
calculate my ideal weight in kilograms Formula and Mathematical Explanation
To calculate my ideal weight in kilograms, clinicians use four main equations: Devine, Hamwi, Robinson, and Miller. Each starts with a base weight at 152.4 cm (60 inches) and adds a coefficient per inch above 60. We average the four results, adjust for frame size derived from height-to-wrist ratio, then fine-tune toward the user's activity level and chosen BMI. This layered approach keeps calculate my ideal weight in kilograms grounded in medical research while personalizing the outcome.
Steps to calculate my ideal weight in kilograms:
Convert height from centimeters to inches.
Apply sex-specific coefficients for Devine, Hamwi, Robinson, and Miller.
Compute BMI-based target weight using weight = BMI × (height in meters)^2.
Derive frame adjustment using height-to-wrist ratio; small frames subtract 5%, large frames add 5%.
Blend activity adjustment: sedentary subtracts 1%, light keeps neutral, moderate adds 1.5%, high adds 3% to the averaged ideal.
Round to one decimal place and present calculate my ideal weight in kilograms as the main result.
Variables in the calculate my ideal weight in kilograms formulas.
Variable
Meaning
Unit
Typical Range
Height
Standing height
cm
150–200
Sex
Male or Female coefficient
n/a
Binary choice
Wrist
Frame size indicator
cm
12–20
Activity
Daily movement level
category
Sedentary–High
BMI
Body Mass Index target
kg/m²
18.5–24.9
IBW
Ideal body weight result
kg
45–90
Practical Examples (Real-World Use Cases)
Example 1: A 170 cm female with a 16 cm wrist, sedentary activity, target BMI 22. When we calculate my ideal weight in kilograms, Devine returns 61.2 kg, Hamwi 59.4 kg, Robinson 58.5 kg, Miller 57.9 kg. Frame ratio suggests a small frame, lowering the blended ideal to about 58.4 kg. The BMI target gives 63.6 kg, so the calculator presents a central ideal of 59.5 kg to help her plan gradual progress.
Example 2: A 185 cm male with a 19 cm wrist, moderately active, target BMI 23.5. When he uses calculate my ideal weight in kilograms, Devine yields 79.2 kg, Hamwi 82.0 kg, Robinson 77.0 kg, Miller 78.3 kg. A larger frame adds 5%, activity adds 1.5%, and BMI target weight is 80.4 kg. The final displayed ideal is about 83.5 kg, guiding nutrition and training toward that healthy zone.
How to Use This calculate my ideal weight in kilograms Calculator
1) Enter height in centimeters; 2) Select sex; 3) Enter age for context; 4) Add wrist circumference for frame sizing; 5) Choose your target BMI; 6) Pick activity level; 7) Press calculate. The tool instantly updates, so you can calculate my ideal weight in kilograms in real time. Read the highlighted ideal as your central target, then compare intermediate values to understand how each formula shapes calculate my ideal weight in kilograms. Use the copy button to share results with your coach or clinician.
Key Factors That Affect calculate my ideal weight in kilograms Results
Height drives the baseline when you calculate my ideal weight in kilograms because every formula scales weight per inch above 152.4 cm. Sex modifies the starting constant, shifting calculate my ideal weight in kilograms up or down. Frame size matters: smaller frames tolerate lower mass, larger frames handle more, so calculate my ideal weight in kilograms must reflect wrist-based sizing. Activity level influences the practical band; athletes can safely aim toward the upper bound when they calculate my ideal weight in kilograms. Target BMI selection anchors calculate my ideal weight in kilograms in public health ranges. Age affects how quickly you should approach the target, even if math is stable. Hydration, muscle gain, and hormonal factors also shift how your body responds as you calculate my ideal weight in kilograms.
Frequently Asked Questions (FAQ)
Does calculate my ideal weight in kilograms change with age? The math is height-based, but pacing and recovery with age guide how you act on calculate my ideal weight in kilograms.
Which formula is most accurate to calculate my ideal weight in kilograms? No single formula wins; averaging Devine, Hamwi, Robinson, and Miller stabilizes calculate my ideal weight in kilograms.
Can athletes use calculate my ideal weight in kilograms? Yes, but they may target the upper BMI band when they calculate my ideal weight in kilograms to allow for muscle mass.
Is BMI enough to calculate my ideal weight in kilograms? BMI is one view; combining BMI with frame and activity refines calculate my ideal weight in kilograms.
How often should I recalculate? Every few months or after major habit changes to keep calculate my ideal weight in kilograms aligned with reality.
What if my frame is very small? A small frame pulls calculate my ideal weight in kilograms downward by about 5% for safety.
Can the calculator handle very tall users? Yes, as long as height stays within the allowed range, it will calculate my ideal weight in kilograms correctly.
How precise are the numbers? Values round to one decimal, keeping calculate my ideal weight in kilograms clear while remaining actionable.
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var chartCtx = null;
var chartData = null;
function calculateIdealWeight(){
var heightCm = parseFloat(document.getElementById("heightCm").value);
var sex = document.getElementById("sex").value;
var age = parseFloat(document.getElementById("age").value);
var wristCm = parseFloat(document.getElementById("wristCm").value);
var targetBmi = parseFloat(document.getElementById("targetBmi").value);
var activity = document.getElementById("activityLevel").value;
var valid = true;
valid = validateInput(heightCm,"errorHeightCm",120,250,"Enter a height between 120 and 250 cm.") && valid;
valid = validateSelect(sex,"errorSex") && valid;
valid = validateInput(age,"errorAge",16,90,"Age must be between 16 and 90 years.") && valid;
valid = validateInput(wristCm,"errorWristCm",10,25,"Wrist size must be 10 to 25 cm.") && valid;
valid = validateInput(targetBmi,"errorTargetBmi",18.5,24.9,"Target BMI must be 18.5 to 24.9.") && valid;
valid = validateSelect(activity,"errorActivity") && valid;
if(!valid){return;}
var heightInches = heightCm/2.54;
var baseInches = heightInches – 60;
if(baseInches 11){frameAdjust = -0.05;}else if(frameRatio < 10){frameAdjust = 0.05;}else{frameAdjust = 0;}
var activityAdjust = 0;
if(activity === "sedentary"){activityAdjust = -0.01;}
if(activity === "light"){activityAdjust = 0;}
if(activity === "moderate"){activityAdjust = 0.015;}
if(activity === "high"){activityAdjust = 0.03;}
var averageIbw = (devine + hamwi + robinson + miller) / 4;
var adjustedIbw = averageIbw + (averageIbw * frameAdjust) + (averageIbw * activityAdjust);
var mainIdeal = (adjustedIbw + bmiWeight) / 2;
mainIdeal = Math.round(mainIdeal * 10) / 10;
devine = Math.round(devine * 10) / 10;
hamwi = Math.round(hamwi * 10) / 10;
robinson = Math.round(robinson * 10) / 10;
miller = Math.round(miller * 10) / 10;
bmiWeight = Math.round(bmiWeight * 10) / 10;
bmiLow = Math.round(bmiLow * 10) / 10;
bmiHigh = Math.round(bmiHigh * 10) / 10;
document.getElementById("mainResult").innerHTML = "Ideal Weight: " + mainIdeal + " kg";
document.getElementById("devineResult").innerHTML = "Devine Ideal Weight: " + devine + " kg";
document.getElementById("hamwiResult").innerHTML = "Hamwi Ideal Weight: " + hamwi + " kg";
document.getElementById("robinsonResult").innerHTML = "Robinson Ideal Weight: " + robinson + " kg";
document.getElementById("millerResult").innerHTML = "Miller Ideal Weight: " + miller + " kg";
document.getElementById("bmiRange").innerHTML = "Healthy BMI Range Weight: " + bmiLow + " kg to " + bmiHigh + " kg (Target " + bmiWeight + " kg)";
document.getElementById("assumptions").innerHTML = "Frame adjustment: " + Math.round(frameAdjust*100) + "%, Activity adjustment: " + Math.round(activityAdjust*1000)/10 + "%, Age context: " + age + " years.";
document.getElementById("formulaNote").innerHTML = "Formula: average of Devine, Hamwi, Robinson, and Miller, plus frame and activity factors, blended with BMI target.";
updateTable(devine, hamwi, robinson, miller, bmiWeight);
updateChart(devine, hamwi, robinson, miller, bmiWeight, bmiLow, bmiHigh);
}
function validateInput(val,errorId,min,max,msg){
var errorEl = document.getElementById(errorId);
if(isNaN(val)){errorEl.innerHTML = "Please enter a valid number.";return false;}
if(val max){errorEl.innerHTML = msg;return false;}
errorEl.innerHTML = "";
return true;
}
function validateSelect(val,errorId){
var errorEl = document.getElementById(errorId);
if(!val){errorEl.innerHTML = "Please make a selection.";return false;}
errorEl.innerHTML = "";
return true;
}
function resetInputs(){
document.getElementById("heightCm").value = 170;
document.getElementById("sex").value = "male";
document.getElementById("age").value = 30;
document.getElementById("wristCm").value = 17;
document.getElementById("targetBmi").value = 22;
document.getElementById("activityLevel").value = "sedentary";
calculateIdealWeight();
}
function updateTable(devine, hamwi, robinson, miller, bmiWeight){
var body = document.getElementById("tableBody");
var rows = "";
rows += "
Devine
Height-driven clinical formula
"+devine+" kg
";
rows += "
Hamwi
Frame-sensitive ideal body weight
"+hamwi+" kg
";
rows += "
Robinson
Lean mass oriented estimation
"+robinson+" kg
";
rows += "
Miller
Balanced medical guideline
"+miller+" kg
";
rows += "
BMI Target
Weight at chosen BMI
"+bmiWeight+" kg
";
body.innerHTML = rows;
}
function updateChart(devine, hamwi, robinson, miller, bmiWeight, bmiLow, bmiHigh){
var canvas = document.getElementById("weightChart");
if(!chartCtx){
chartCtx = canvas.getContext("2d");
}
chartCtx.clearRect(0,0,canvas.width,canvas.height);
var labels = ["Devine","Hamwi","Robinson","Miller","BMI Target"];
var series1 = [devine, hamwi, robinson, miller, bmiWeight];
var series2 = [bmiLow, bmiLow, bmiLow, bmiLow, bmiHigh];
var maxVal = Math.max.apply(null, series1.concat(series2)) + 10;
var barWidth = 50;
var gap = 30;
var startX = 40;
var baseY = canvas.height – 30;
chartCtx.fillStyle = "#0b2a55";
chartCtx.font = "12px Arial";
chartCtx.fillText("Weight (kg)",5,14);
for(var i=0;i<labels.length;i++){
var x = startX + i*(barWidth*2 + gap);
var barHeight1 = (series1[i]/maxVal)*(canvas.height-80);
var barHeight2 = (series2[i]/maxVal)*(canvas.height-80);
chartCtx.fillStyle = "#004a99";
chartCtx.fillRect(x, baseY – barHeight1, barWidth, barHeight1);
chartCtx.fillStyle = "#28a745";
chartCtx.fillRect(x + barWidth + 6, baseY – barHeight2, barWidth-6, barHeight2);
chartCtx.fillStyle = "#102037";
chartCtx.fillText(labels[i], x, baseY + 14);
chartCtx.fillText(series1[i]+" kg", x, baseY – barHeight1 – 6);
chartCtx.fillText(series2[i]+" kg", x + barWidth + 6, baseY – barHeight2 – 6);
}
chartCtx.fillStyle = "#004a99";
chartCtx.fillRect(canvas.width – 180, 16, 14, 14);
chartCtx.fillStyle = "#102037";
chartCtx.fillText("Ideal Weight", canvas.width – 160, 28);
chartCtx.fillStyle = "#28a745";
chartCtx.fillRect(canvas.width – 180, 36, 14, 14);
chartCtx.fillStyle = "#102037";
chartCtx.fillText("BMI Bounds/Target", canvas.width – 160, 48);
}
function copyResults(){
var text = "";
text += document.getElementById("mainResult").innerText + "\n";
text += document.getElementById("devineResult").innerText + "\n";
text += document.getElementById("hamwiResult").innerText + "\n";
text += document.getElementById("robinsonResult").innerText + "\n";
text += document.getElementById("millerResult").innerText + "\n";
text += document.getElementById("bmiRange").innerText + "\n";
text += document.getElementById("assumptions").innerText + "\n";
text += "Key assumption: calculate my ideal weight in kilograms blends four formulas, frame, activity, and BMI target.";
if(navigator.clipboard && navigator.clipboard.writeText){
navigator.clipboard.writeText(text);
}
}
resetInputs();