Find your perfect bra fit by accurately measuring your band and cup size.
Standard/Comfort Fit
Tighter Fit
Looser Fit
Your Estimated Bra Size:
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Understanding Bra Sizing: A Comprehensive Guide
Achieving the perfect bra fit is crucial for comfort, support, and overall well-being. An ill-fitting bra can lead to discomfort, pain, poor posture, and even skin irritation. This calculator aims to provide a reliable estimation of your bra size based on two key measurements: your band size and your bust size.
The Two Key Measurements:
Band Measurement: This is the measurement around your ribcage directly under your breasts. It forms the foundation of your bra's support. A properly fitted band should be snug but comfortable, parallel to the ground, and allow you to fit no more than two fingers underneath it.
Bust Measurement: This measurement is taken around the fullest part of your bust, typically over the nipples. Ensure the tape measure is level and not too tight, allowing for a comfortable fit without compressing the breast tissue.
How the Calculation Works:
Our calculator uses a standard industry method to determine your bra size. The process involves the following steps:
Determining Band Size:
Measure your underbust (band measurement) in inches.
Typically, this measurement directly corresponds to your band size (e.g., 32 inches = size 32 band).
However, some systems add a small amount (e.g., 4-5 inches) to this measurement to account for the bra's structure and to ensure a snug fit. Our calculator uses a common approach where the measured band size is the primary band size, and slight adjustments can be considered based on fit preference.
Determining Cup Size:
Subtract your band measurement from your bust measurement. The difference in inches indicates your cup size.
Difference Calculation:
0-1 inch difference: AA cup
1 inch difference: A cup
2 inch difference: B cup
3 inch difference: C cup
4 inch difference: D cup
5 inch difference: DD/E cup
6 inch difference: DDD/F cup
And so on, typically adding one letter for each additional inch.
Formula: Cup Size = Bust Measurement – Band Measurement
Considering Fit Preference: The 'Bra Type/Fit' option allows for minor adjustments. A 'Tighter Fit' might suggest trying a band size down if the calculated size feels loose, while a 'Looser Fit' might suggest trying a band size up if it feels restrictive. This is because different bra styles and brands can fit differently.
Important Considerations:
While this calculator provides a strong starting point, remember that:
Brand Variations: Bra sizing can vary significantly between brands and even between different styles within the same brand.
Body Shape: Individual body shapes and breast tissue distribution can affect fit.
Comfort is Key: Always prioritize comfort. If a calculated size feels uncomfortable, try sister sizes (e.g., if 34C feels too tight in the band, try 36B; if it feels too loose, try 32D).
Professional Fitting: For the most accurate results, a professional fitting at a reputable lingerie store is always recommended.
Use this calculator as a guide to better understand your measurements and to help you navigate the often-confusing world of bra sizing with more confidence.
function calculateBraSize() {
var bandMeasurement = parseFloat(document.getElementById("bandMeasurement").value);
var bustMeasurement = parseFloat(document.getElementById("bustMeasurement").value);
var braPreference = document.getElementById("braPreference").value;
var braSizeResultElement = document.getElementById("braSizeResult");
var fitRecommendationElement = document.getElementById("fitRecommendation");
// Clear previous results
braSizeResultElement.textContent = "-";
fitRecommendationElement.textContent = "-";
// Input validation
if (isNaN(bandMeasurement) || bandMeasurement <= 0 || bandMeasurement 60) {
alert("Please enter a valid band measurement between 20 and 60 inches.");
return;
}
if (isNaN(bustMeasurement) || bustMeasurement <= 0 || bustMeasurement 70) {
alert("Please enter a valid bust measurement between 24 and 70 inches.");
return;
}
if (bustMeasurement = 0 && cupDifference 1 && cupDifference 2 && cupDifference 3 && cupDifference 4 && cupDifference 5 && cupDifference 6 && cupDifference 7 && cupDifference <= 8) {
cupSize = "G";
} else {
cupSize = "Larger"; // For very large differences
}
// Adjust band size based on preference (simplified logic)
var finalBandSize = bandSize;
if (braPreference === "tight") {
// Suggest trying one size up in band if preference is tighter fit
// This is a simplification; actual recommendation might vary
fitNote = "You prefer a snugger fit. If this feels loose, try a band size up (e.g., if calculated 34, try 36).";
} else if (braPreference === "loose") {
// Suggest trying one size down in band if preference is looser fit
fitNote = "You prefer a looser fit. If this feels tight, try a band size down (e.g., if calculated 34, try 32).";
} else {
fitNote = "This size is based on standard comfort fit. Consider sister sizes if needed.";
}
braSizeResultElement.textContent = finalBandSize + cupSize;
fitRecommendationElement.textContent = fitNote;
}