Bra Size Calculator (CM)
Use this calculator to determine your bra size based on your underbust and bust measurements in centimeters. Accurate measurements are key to finding a comfortable and supportive bra.
function calculateBraSize() {
var underbust = parseFloat(document.getElementById('underbustMeasurement').value);
var bust = parseFloat(document.getElementById('bustMeasurement').value);
var resultDiv = document.getElementById('braSizeResult');
if (isNaN(underbust) || isNaN(bust) || underbust <= 0 || bust <= 0) {
resultDiv.innerHTML = 'Please enter valid positive numbers for both measurements.';
return;
}
if (bust <= underbust) {
resultDiv.innerHTML = 'Your bust measurement must be greater than your underbust measurement.';
return;
}
// European Band Size Calculation (CM)
// Round underbust to the nearest 5cm increment (e.g., 65, 70, 75, 80)
var bandSize = Math.round(underbust / 5) * 5;
if (bandSize < 65) { // Minimum common band size
bandSize = 65;
}
// Cup Size Calculation (CM)
// Difference between bust and underbust measurement
var cupDifference = bust – underbust;
var cupSize = '';
if (cupDifference = 10 && cupDifference = 12 && cupDifference = 14 && cupDifference = 16 && cupDifference = 18 && cupDifference = 20 && cupDifference = 22 && cupDifference = 24 && cupDifference = 26 && cupDifference = 28 && cupDifference = 30 && cupDifference < 32) {
cupSize = 'K';
} else {
cupSize = 'L+ (Consult a specialist)';
}
resultDiv.innerHTML = 'Your estimated bra size is:
' + bandSize + cupSize + ' (EU)' +
'This is an estimate based on common European sizing. Bra fit can vary by brand and style.';
}
.bra-size-calculator-cm-container {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
max-width: 600px;
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);
color: #333;
}
.bra-size-calculator-cm-container h2 {
text-align: center;
color: #2c3e50;
margin-bottom: 20px;
font-size: 1.8em;
}
.bra-size-calculator-cm-container p {
line-height: 1.6;
margin-bottom: 15px;
color: #555;
}
.calculator-form .form-group {
margin-bottom: 18px;
}
.calculator-form label {
display: block;
margin-bottom: 8px;
font-weight: bold;
color: #444;
font-size: 1.05em;
}
.calculator-form input[type="number"] {
width: calc(100% – 20px);
padding: 12px;
border: 1px solid #ccc;
border-radius: 6px;
font-size: 1em;
box-sizing: border-box;
transition: border-color 0.3s ease;
}
.calculator-form input[type="number"]:focus {
border-color: #007bff;
outline: none;
box-shadow: 0 0 5px rgba(0, 123, 255, 0.3);
}
.calculate-button {
display: block;
width: 100%;
padding: 14px 20px;
background-color: #007bff;
color: white;
border: none;
border-radius: 6px;
font-size: 1.1em;
font-weight: bold;
cursor: pointer;
transition: background-color 0.3s ease, transform 0.2s ease;
margin-top: 20px;
}
.calculate-button:hover {
background-color: #0056b3;
transform: translateY(-2px);
}
.calculate-button:active {
transform: translateY(0);
}
.result-container {
margin-top: 25px;
padding: 15px;
border: 1px solid #d4edda;
background-color: #e9f7ef;
border-radius: 8px;
text-align: center;
font-size: 1.15em;
color: #155724;
font-weight: bold;
}
.result-container p {
margin: 5px 0;
}
.result-container .note {
font-size: 0.9em;
color: #38704a;
font-weight: normal;
margin-top: 10px;
}
.result-container .error {
color: #721c24;
background-color: #f8d7da;
border-color: #f5c6cb;
padding: 10px;
border-radius: 5px;
font-weight: normal;
}
Understanding Your Bra Size in Centimeters
Finding the right bra size is crucial for comfort, support, and overall breast health. Many women wear the wrong size, leading to discomfort, poor posture, and even pain. This calculator uses the European sizing system, which relies on precise centimeter measurements for both the band and cup.
How to Measure Correctly:
- Underbust Measurement (Band Size):
- Stand upright and exhale completely.
- Wrap a soft measuring tape snugly around your rib cage, directly under your bust.
- Ensure the tape is level all the way around and not twisted.
- Read the measurement in centimeters. This measurement is used to determine your band size.
- Bust Measurement (Cup Size):
- Stand upright and wrap the measuring tape around the fullest part of your bust.
- Make sure the tape is level and not too tight or too loose.
- Breathe normally and read the measurement in centimeters.
How Bra Size is Calculated (European System):
The European bra sizing system typically uses your underbust measurement directly for the band size, rounded to the nearest 5 cm increment (e.g., 65, 70, 75, 80). The cup size is then determined by the difference between your bust measurement and your underbust measurement.
- Band Size: Your underbust measurement (e.g., 73 cm rounds to a 75 band).
- Cup Size: The difference between your bust and underbust measurements corresponds to a letter:
- Less than 10 cm difference: AA
- 10-11.9 cm difference: A
- 12-13.9 cm difference: B
- 14-15.9 cm difference: C
- 16-17.9 cm difference: D
- 18-19.9 cm difference: E
- 20-21.9 cm difference: F
- And so on, with each letter typically representing an additional 2 cm difference.
Realistic Examples:
- Example 1:
- Underbust: 72 cm
- Bust: 88 cm
- Band Size: 70 (72 cm rounded to nearest 5 cm)
- Cup Difference: 88 cm – 72 cm = 16 cm
- Calculated Bra Size: 70D
- Example 2:
- Underbust: 81 cm
- Bust: 95 cm
- Band Size: 80 (81 cm rounded to nearest 5 cm)
- Cup Difference: 95 cm – 81 cm = 14 cm
- Calculated Bra Size: 80C
- Example 3:
- Underbust: 68 cm
- Bust: 80 cm
- Band Size: 70 (68 cm rounded to nearest 5 cm)
- Cup Difference: 80 cm – 68 cm = 12 cm
- Calculated Bra Size: 70B
Remember that bra sizing can vary slightly between brands and styles. This calculator provides a great starting point, but trying on bras is always recommended for the perfect fit.