.bra-size-calculator-container {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
max-width: 700px;
margin: 20px auto;
padding: 25px;
border: 1px solid #e0e0e0;
border-radius: 10px;
background-color: #ffffff;
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}
.bra-size-calculator-container h2 {
text-align: center;
color: #333;
margin-bottom: 25px;
font-size: 28px;
font-weight: 600;
}
.bra-size-calculator-container .input-group {
margin-bottom: 18px;
display: flex;
flex-direction: column;
}
.bra-size-calculator-container label {
margin-bottom: 8px;
font-weight: 500;
color: #555;
font-size: 16px;
}
.bra-size-calculator-container input[type="number"],
.bra-size-calculator-container select {
width: 100%;
padding: 12px;
border: 1px solid #ccc;
border-radius: 6px;
font-size: 16px;
box-sizing: border-box;
transition: border-color 0.3s ease;
}
.bra-size-calculator-container input[type="number"]:focus,
.bra-size-calculator-container select:focus {
border-color: #007bff;
outline: none;
box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}
.bra-size-calculator-container button {
display: block;
width: 100%;
padding: 14px 20px;
background-color: #007bff;
color: white;
border: none;
border-radius: 6px;
font-size: 18px;
font-weight: 600;
cursor: pointer;
transition: background-color 0.3s ease, transform 0.2s ease;
margin-top: 25px;
}
.bra-size-calculator-container button:hover {
background-color: #0056b3;
transform: translateY(-2px);
}
.bra-size-calculator-container #braSizeResult {
margin-top: 30px;
padding: 20px;
border: 1px solid #d4edda;
background-color: #e9f7ef;
border-radius: 8px;
text-align: center;
font-size: 18px;
color: #155724;
line-height: 1.6;
}
.bra-size-calculator-container #braSizeResult h3 {
color: #0f5132;
margin-top: 0;
font-size: 24px;
font-weight: 600;
}
.bra-size-calculator-container #braSizeResult p {
margin: 8px 0;
}
.bra-size-calculator-container #braSizeResult strong {
color: #0f5132;
}
.bra-size-calculator-container .note {
font-size: 14px;
color: #6c757d;
margin-top: 15px;
}
.bra-size-calculator-container .error-message {
color: #dc3545;
font-size: 14px;
margin-top: 10px;
}
function calculateBraSize() {
var underBust = parseFloat(document.getElementById("underBustMeasurement").value);
var fullBust = parseFloat(document.getElementById("fullBustMeasurement").value);
var unit = document.getElementById("measurementUnit").value;
var resultDiv = document.getElementById("braSizeResult");
if (isNaN(underBust) || isNaN(fullBust) || underBust <= 0 || fullBust <= 0) {
resultDiv.innerHTML = "Please enter valid positive numbers for both measurements.";
return;
}
if (fullBust < underBust) {
resultDiv.innerHTML = "Your full bust measurement cannot be smaller than your underbust measurement. Please re-measure.";
return;
}
// Convert cm to inches if necessary
if (unit === "cm") {
underBust = underBust / 2.54;
fullBust = fullBust / 2.54;
}
// Calculate Band Size (US/UK Modern Method)
// Round to nearest whole number, then ensure it's an even number.
var bandSize = Math.round(underBust);
if (bandSize % 2 !== 0) {
bandSize++;
}
// Ensure minimum common band size (e.g., 28)
if (bandSize < 28) {
bandSize = 28;
}
// Calculate Cup Size
var cupDifference = fullBust – underBust;
var cupSize = "";
var roundedCupDifference = Math.round(cupDifference);
switch (roundedCupDifference) {
case 0: cupSize = "AA"; break;
case 1: cupSize = "A"; break;
case 2: cupSize = "B"; break;
case 3: cupSize = "C"; break;
case 4: cupSize = "D"; break;
case 5: cupSize = "DD (E)"; break;
case 6: cupSize = "DDD (F)"; break;
case 7: cupSize = "G"; break;
case 8: cupSize = "H"; break;
case 9: cupSize = "I"; break;
case 10: cupSize = "J"; break;
case 11: cupSize = "K"; break;
case 12: cupSize = "L"; break;
default:
if (roundedCupDifference < 0) { // Should be caught by fullBust < underBust check
cupSize = "AA (or smaller)";
} else {
cupSize = "M (or larger)";
}
break;
}
var resultHTML = "
Bra Size Calculator
Inches
Centimeters
Your Estimated Bra Size:
"; resultHTML += "Band Size: " + bandSize + ""; resultHTML += "Cup Size: " + cupSize + ""; resultHTML += "Full Bra Size: " + bandSize + cupSize + ""; resultHTML += "Note: Bra sizing can vary significantly between brands and body shapes. This is an estimate based on common US/UK sizing conventions. Always try on bras to find the best fit."; resultDiv.innerHTML = resultHTML; }Understanding Your Bra Size: A Comprehensive Guide
Finding the perfect bra can feel like a quest, but knowing your correct bra size is the first and most crucial step. An ill-fitting bra can cause discomfort, poor posture, and even affect your confidence. This guide, along with our Bra Size Calculator, will help you demystify the process and get closer to finding your ideal fit.
Why Accurate Bra Sizing Matters
Many women wear the wrong bra size, often due to outdated measuring methods or simply guessing. A well-fitting bra provides proper support, enhances your silhouette, and prevents common issues like shoulder pain, backaches, and breast discomfort. It can also make your clothes fit better and boost your overall comfort throughout the day.
How to Measure Your Bra Size at Home
To use our calculator effectively, you'll need two key measurements. Make sure you're wearing a non-padded bra or no bra at all for the most accurate results. You'll need a soft tape measure.
Step 1: Measure Your Underbust (Band Size)
- Position the Tape: Wrap the tape measure snugly around your rib cage, directly underneath your bust. Ensure it's level all the way around your back.
- Exhale and Measure: Exhale fully to get the smallest possible measurement. The tape should be firm but not digging into your skin.
- Record the Number: Note this measurement in either inches or centimeters. This will be used to determine your band size.
Step 2: Measure Your Full Bust (Cup Size)
- Position the Tape: Wrap the tape measure around the fullest part of your bust. This is usually across your nipples.
- Keep it Loose: The tape should be comfortably loose, not compressing your breasts. Ensure it's level across your back.
- Record the Number: Note this measurement in the same unit (inches or centimeters) as your underbust measurement.
How Our Bra Size Calculator Works
Our calculator uses the two measurements you provide to estimate your bra size based on common US/UK sizing conventions. Here's a breakdown of the logic:
- Band Size: Your underbust measurement is rounded to the nearest whole number. If the result is an odd number, it's typically rounded up to the next even number (e.g., 31 inches becomes a 32 band). This is because most bra bands are manufactured in even sizes.
- Cup Size: The difference between your full bust measurement and your underbust measurement determines your cup size. Each inch of difference corresponds to a specific cup letter:
- Less than 1 inch difference: AA
- 1 inch difference: A
- 2 inches difference: B
- 3 inches difference: C
- 4 inches difference: D
- 5 inches difference: DD (or E)
- 6 inches difference: DDD (or F)
- And so on for larger cup sizes.
Realistic Examples
Let's look at a few examples to illustrate how the calculator works:
Example 1: Average Sizing (Inches)
- Underbust Measurement: 30.5 inches
- Full Bust Measurement: 35 inches
- Calculation:
- Band Size: 30.5 rounds to 31, then to 32 (next even number).
- Cup Difference: 35 – 30.5 = 4.5 inches. Rounded to 5 inches.
- Cup Size: 5 inches difference corresponds to DD (E).
- Estimated Bra Size: 32DD (E)
Example 2: Smaller Sizing (Centimeters)
- Underbust Measurement: 70 cm
- Full Bust Measurement: 80 cm
- Calculation:
- Convert to Inches: Underbust = 70 / 2.54 ≈ 27.56 inches. Full Bust = 80 / 2.54 ≈ 31.5 inches.
- Band Size: 27.56 rounds to 28.
- Cup Difference: 31.5 – 27.56 = 3.94 inches. Rounded to 4 inches.
- Cup Size: 4 inches difference corresponds to D.
- Estimated Bra Size: 28D
Example 3: Larger Sizing (Inches)
- Underbust Measurement: 36 inches
- Full Bust Measurement: 44 inches
- Calculation:
- Band Size: 36 inches (already an even number).
- Cup Difference: 44 – 36 = 8 inches.
- Cup Size: 8 inches difference corresponds to H.
- Estimated Bra Size: 36H
Important Considerations and Disclaimers
- Brand Variations: Bra sizing is not universal. A 34C in one brand might fit differently than a 34C in another. Always try on bras from different brands.
- Sister Sizes: If your calculated size doesn't feel quite right, you might explore "sister sizes." These are bra sizes with the same cup volume but different band sizes (e.g., 34B, 32C, and 36A are sister sizes).
- Body Changes: Your bra size can change due to weight fluctuations, pregnancy, breastfeeding, or hormonal shifts. It's a good idea to re-measure periodically.
- Professional Fitting: While this calculator provides a great starting point, a professional bra fitting at a lingerie store can offer personalized advice and ensure the best possible fit.
- Comfort is Key: Ultimately, the best bra size is the one that feels most comfortable and supportive for you.
Use this calculator as a helpful tool to guide your bra shopping experience. Happy fitting!