Use this bmi calculator to lose weight female health goals with accurate BMI, calorie targets, and timelines tailored for women seeking sustainable fat loss.
BMI Calculator to Lose Weight Female: Inputs
Enter your present weight in kilograms.
Use a stadiometer reading for accuracy.
BMR for women changes with age.
Choose a realistic, healthy target weight.
Sedentary (little exercise)
Light (1-3 days/week)
Moderate (3-5 days/week)
Active (6-7 days/week)
Athlete (2x per day)
Chart shows projected weekly BMI and weight change based on your bmi calculator to lose weight female settings.
What is bmi calculator to lose weight female?
The bmi calculator to lose weight female approach measures body mass index to guide calorie intake for women who want fat loss without muscle loss. A bmi calculator to lose weight female tool converts height and weight into a BMI value, then pairs it with calorie needs so women can choose a realistic pace of change. Women should use a bmi calculator to lose weight female when setting goals, monitoring trends, or adjusting eating plans around menstrual cycles and lifestyle shifts.
Common misconceptions about a bmi calculator to lose weight female include thinking BMI is the only marker of health, believing faster loss is always better, or assuming all calorie targets are identical across ages and activity levels.
bmi calculator to lose weight female Formula and Mathematical Explanation
The bmi calculator to lose weight female uses two core formulas. First, BMI = weight (kg) / (height (m))². Second, female BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age − 161. TDEE = BMR × activity factor. Daily deficit = weekly loss (kg) × 7700 / 7. Safe target calories = TDEE − deficit, never dropping below 1200 kcal. The bmi calculator to lose weight female combines these steps to keep fat loss steady.
Variables Used in the bmi calculator to lose weight female
Variable
Meaning
Unit
Typical Range
Weight
Current body mass
kg
40-180
Height
Stature used for BMI
cm
140-190
Age
Impacts female BMR
years
18-70
Activity factor
Adjusts TDEE
multiplier
1.2-1.9
Weekly loss
Desired fat loss pace
kg/week
0.2-0.9
Goal weight
Target mass
kg
40-180
Practical Examples (Real-World Use Cases)
Example 1: A 32-year-old woman, 165 cm and 70 kg, uses the bmi calculator to lose weight female tool. Her BMI is 25.7, BMR is about 1431 kcal. With a light activity factor of 1.375, TDEE is 1968 kcal. Choosing 0.5 kg/week loss yields a 550 kcal deficit, so target intake is 1418 kcal. Her goal BMI at 60 kg is 22.0, which fits the normal category.
Example 2: A 45-year-old woman, 170 cm and 90 kg, selects the bmi calculator to lose weight female with moderate activity. BMI is 31.1, BMR about 1530 kcal, TDEE 2372 kcal. A gentle 0.3 kg/week loss needs a 330 kcal deficit, setting intake near 2042 kcal. Her goal weight of 72 kg gives a goal BMI of 24.9. The bmi calculator to lose weight female output shows roughly 60 weeks to reach the target while preserving energy for strength training.
These examples show how the bmi calculator to lose weight female balances deficit size with metabolism, guiding safe and predictable progress.
How to Use This bmi calculator to lose weight female Calculator
Enter current weight, height, age, and goal weight into the bmi calculator to lose weight female fields.
Select your activity level for an accurate TDEE.
Choose a weekly loss pace that feels sustainable.
Review the BMI, goal BMI, calorie deficit, and weeks to goal.
Use the chart to visualize the bmi calculator to lose weight female projection.
Reading results: focus on whether the bmi calculator to lose weight female keeps calories above 1200, keeps BMI moving toward normal, and offers a realistic timeline. Adjust weekly loss if fatigue or performance decline.
Decision guidance: if the bmi calculator to lose weight female shows an aggressive deficit, increase calories or activity slowly. If progress is slow, add light resistance training and reassess the deficit.
Key Factors That Affect bmi calculator to lose weight female Results
Several forces change outcomes in a bmi calculator to lose weight female:
Metabolic rate declines with age, lowering TDEE.
Activity factor drives the gap between BMR and total burn.
Protein intake influences satiety and lean mass retention.
Is the bmi calculator to lose weight female accurate for athletes? It estimates weight trends but athletes should also track body fat.
How low can calories go? The bmi calculator to lose weight female keeps a 1200 kcal floor to protect micronutrient intake.
Does muscle gain affect BMI? Yes, muscle adds weight; pair bmi calculator to lose weight female results with circumference tracking.
Can pregnant women use it? No, pregnancy needs medical guidance beyond a bmi calculator to lose weight female.
Why did my BMI rise after strength training? Temporary water and glycogen can elevate scale weight; the bmi calculator to lose weight female should be reviewed over weeks.
Is 1 kg/week safe? For many women it is high; the bmi calculator to lose weight female suggests 0.2–0.9 kg/week.
How often should I recalc? Weekly updates keep the bmi calculator to lose weight female aligned with true weight.
What if my goal BMI is under 18.5? Raise the goal; the bmi calculator to lose weight female emphasizes health over extreme leanness.
body fat calculator – checks composition while using the bmi calculator to lose weight female.
TDEE calculator – refines activity factors feeding the bmi calculator to lose weight female.
protein intake calculator – keeps protein adequate during bmi calculator to lose weight female plans.
BMR calculator – validates metabolic inputs for the bmi calculator to lose weight female.
macro calculator – sets carbs and fats around the bmi calculator to lose weight female calories.
var chartCanvas = document.getElementById("progressChart");
var ctx = chartCanvas.getContext("2d");
var chartDataBMI = [];
var chartDataWeight = [];
var chartLabels = [];
function validateInput(value,min,max){
if(value===""||isNaN(value)){return "Value required";}
var num=parseFloat(value);
if(nummax){return "Must be at most "+max;}
return "";
}
function displayError(id,message){
var el=document.getElementById("error-"+id);
if(el){
if(message!==""){
el.style.display="block";
el.innerHTML=message;
}else{
el.style.display="none";
el.innerHTML="";
}
}
}
function calculateBMI(){
var weight=document.getElementById("weight").value;
var height=document.getElementById("height").value;
var age=document.getElementById("age").value;
var goalWeight=document.getElementById("goalWeight").value;
var activityLevel=document.getElementById("activityLevel").value;
var weeklyLoss=document.getElementById("weeklyLoss").value;
var vWeight=validateInput(weight,30,200);
var vHeight=validateInput(height,130,210);
var vAge=validateInput(age,18,80);
var vGoal=validateInput(goalWeight,40,180);
var vActivity=validateInput(activityLevel,1.2,1.9);
var vWeekly=validateInput(weeklyLoss,0.2,1);
displayError("weight",vWeight);
displayError("height",vHeight);
displayError("age",vAge);
displayError("goalWeight",vGoal);
displayError("activityLevel",vActivity);
displayError("weeklyLoss",vWeekly);
if(vWeight!==""||vHeight!==""||vAge!==""||vGoal!==""||vActivity!==""||vWeekly!==""){
return;
}
var w=parseFloat(weight);
var h=parseFloat(height);
var a=parseFloat(age);
var gw=parseFloat(goalWeight);
var act=parseFloat(activityLevel);
var wl=parseFloat(weeklyLoss);
var heightM=h/100;
var bmi=w/(heightM*heightM);
var goalBmi=gw/(heightM*heightM);
var bmr=10*w+6.25*h-5*a-161;
var tdee=bmr*act;
var dailyDeficit=wl*7700/7;
var targetCalories=tdee-dailyDeficit;
if(targetCaloriesgw && wl>0){
weeksToGoal=(w-gw)/wl;
}
document.getElementById("currentBMI").innerHTML=bmi.toFixed(1);
document.getElementById("goalBMI").innerHTML=goalBmi.toFixed(1);
document.getElementById("tdee").innerHTML=Math.round(tdee)+" kcal";
document.getElementById("dailyDeficit").innerHTML=Math.round(dailyDeficit)+" kcal/day";
document.getElementById("weeksToGoal").innerHTML=weeksToGoal>0?weeksToGoal.toFixed(1)+" weeks":"On target";
document.getElementById("mainResult").innerHTML=Math.round(targetCalories)+" kcal/day";
updateChart(w,gw,heightM,bmi,goalBmi,weeksToGoal);
}
function updateChart(currentWeight,goalWeight,heightM,bmi,goalBmi,weeks){
var points=12;
chartDataBMI=[];
chartDataWeight=[];
chartLabels=[];
var span=weeks;
if(span<1){span=points;}
var step=span/(points-1);
var i=0;
while(i<points){
var progress=i/(points-1);
var projWeight=currentWeight-(currentWeight-goalWeight)*progress;
var projBMI=projWeight/(heightM*heightM);
chartDataBMI.push(projBMI);
chartDataWeight.push(projWeight);
chartLabels.push((step*i).toFixed(1));
i++;
}
drawChart();
}
function drawChart(){
ctx.clearRect(0,0,chartCanvas.width,chartCanvas.height);
var padding=40;
var width=chartCanvas.width-padding*2;
var height=chartCanvas.height-padding*2;
var maxVal=Math.max(Math.max.apply(null,chartDataBMI),Math.max.apply(null,chartDataWeight));
var minVal=Math.min(Math.min.apply(null,chartDataBMI),Math.min.apply(null,chartDataWeight));
if(maxVal===minVal){maxVal=minVal+1;}
ctx.strokeStyle="#d9e2ef";
ctx.lineWidth=1;
var gridLines=5;
var g=0;
while(g<=gridLines){
var y=padding+height*(g/gridLines);
ctx.beginPath();
ctx.moveTo(padding,y);
ctx.lineTo(padding+width,y);
ctx.stroke();
var val=maxVal-(maxVal-minVal)*(g/gridLines);
ctx.fillStyle="#55647a";
ctx.font="12px Arial";
ctx.fillText(val.toFixed(1),5,y+4);
g++;
}
var n=chartDataBMI.length;
if(n<2){return;}
ctx.strokeStyle="#004a99";
ctx.lineWidth=3;
ctx.beginPath();
var j=0;
while(j<n){
var x=padding+width*(j/(n-1));
var y=padding+height*(1-(chartDataBMI[j]-minVal)/(maxVal-minVal));
if(j===0){ctx.moveTo(x,y);}else{ctx.lineTo(x,y);}
j++;
}
ctx.stroke();
ctx.strokeStyle="#28a745";
ctx.lineWidth=3;
ctx.beginPath();
j=0;
while(j<n){
var xw=padding+width*(j/(n-1));
var yw=padding+height*(1-(chartDataWeight[j]-minVal)/(maxVal-minVal));
if(j===0){ctx.moveTo(xw,yw);}else{ctx.lineTo(xw,yw);}
j++;
}
ctx.stroke();
ctx.fillStyle="#0f1f2f";
ctx.font="12px Arial";
ctx.fillText("Weeks",padding+width/2-20,chartCanvas.height-10);
}
function resetForm(){
document.getElementById("weight").value="70";
document.getElementById("height").value="165";
document.getElementById("age").value="30";
document.getElementById("goalWeight").value="60";
document.getElementById("activityLevel").value="1.375";
document.getElementById("weeklyLoss").value="0.5";
var errors=["weight","height","age","goalWeight","activityLevel","weeklyLoss"];
var k=0;
while(k<errors.length){
displayError(errors[k],"");
k++;
}
calculateBMI();
}
function copyResults(){
var text="BMI Calculator to Lose Weight Female Results:\n";
text+="Recommended Daily Calories: "+document.getElementById("mainResult").innerHTML+"\n";
text+="Current BMI: "+document.getElementById("currentBMI").innerHTML+"\n";
text+="Goal BMI: "+document.getElementById("goalBMI").innerHTML+"\n";
text+="TDEE: "+document.getElementById("tdee").innerHTML+"\n";
text+="Daily Deficit: "+document.getElementById("dailyDeficit").innerHTML+"\n";
text+="Weeks to Goal: "+document.getElementById("weeksToGoal").innerHTML+"\n";
text+="Assumptions: Mifflin-St Jeor female, activity factor from selection, deficit from weekly loss.";
if(navigator.clipboard&&navigator.clipboard.writeText){
navigator.clipboard.writeText(text);
}
}
resetForm();