Bra Sizing Guide Calculator

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Bra Sizing Guide Calculator

Finding the right bra size is crucial for comfort, support, and the overall look of your clothing. Many women wear the wrong bra size, leading to discomfort, poor posture, and an unflattering silhouette. This calculator helps you estimate your correct bra size by taking two simple measurements.

Why Accurate Bra Sizing Matters

A well-fitting bra can significantly improve your posture, alleviate back and shoulder pain, and enhance the fit of your clothes. Conversely, a poorly fitting bra can cause digging straps, bulging, gaping cups, and inadequate support, leading to discomfort and potential health issues over time.

How to Take Your Measurements

For the most accurate results, wear a lightly lined, non-padded bra or no bra at all. Use a soft measuring tape and stand in front of a mirror to ensure the tape is level.

  1. Under Bust Measurement (Band Size): Wrap the measuring tape snugly around your rib cage, directly under your bust. Make sure the tape is level all the way around your back. Exhale fully to get the smallest possible measurement. Record this number in inches.
  2. Full Bust Measurement (Cup Size): Wrap the measuring tape around the fullest part of your bust, usually across your nipples. Ensure the tape is level and not too tight or too loose. Record this number in inches.

Enter Your Measurements

Your estimated bra size will appear here.

Understanding Your Bra Size

Your bra size consists of two parts: the band size (the number) and the cup size (the letter).

  • Band Size: This number (e.g., 32, 34, 36) corresponds to the measurement around your rib cage. It provides the majority of the support for your breasts.
  • Cup Size: This letter (e.g., A, B, C, D) represents the difference between your full bust and band measurement. It indicates the volume of your breasts.

Examples of Bra Size Calculation:

  • Example 1: If your Under Bust is 30 inches and Full Bust is 33 inches, your estimated size would be 30C. (Band: 30, Cup Difference: 3 inches = C)
  • Example 2: If your Under Bust is 31.5 inches and Full Bust is 36 inches, your estimated size would be 32D. (Band: 32, Cup Difference: 4 inches = D)
  • Example 3: If your Under Bust is 34 inches and Full Bust is 34.5 inches, your estimated size would be 34AA. (Band: 34, Cup Difference: 0.5 inches = AA)

Important Note: Bra sizing can vary significantly between different brands and styles. This calculator provides a good starting point, but it's always recommended to try on bras to find the perfect fit. Consider visiting a professional bra fitter for personalized advice.

function calculateBraSize() { var underBust = parseFloat(document.getElementById('underBustMeasurement').value); var fullBust = parseFloat(document.getElementById('fullBustMeasurement').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 less than your under bust measurement. Please re-enter your measurements.'; return; } // Calculate Band Size (Modern Method: Round to nearest whole, then ensure even) var calculatedBand = Math.round(underBust); if (calculatedBand % 2 !== 0) { // If odd, add 1 to make it an even number calculatedBand += 1; } // Ensure a reasonable minimum band size, typically 28 or 30 if (calculatedBand < 28) { calculatedBand = 28; } // Calculate Cup Size: Difference between full bust and calculated band size var cupDifference = fullBust – calculatedBand; var cupSize = ''; if (cupDifference < 0) { // Should ideally not happen with valid inputs, but for robustness cupSize = 'Error (check measurements)'; } else if (cupDifference < 1) { // 0 to <1 inch difference cupSize = 'AA'; } else if (cupDifference < 2) { // 1 to <2 inches difference cupSize = 'A'; } else if (cupDifference < 3) { // 2 to <3 inches difference cupSize = 'B'; } else if (cupDifference < 4) { // 3 to <4 inches difference cupSize = 'C'; } else if (cupDifference < 5) { // 4 to <5 inches difference cupSize = 'D'; } else if (cupDifference < 6) { // 5 to <6 inches difference cupSize = 'DD/E'; } else if (cupDifference < 7) { // 6 to <7 inches difference cupSize = 'DDD/F'; } else if (cupDifference < 8) { // 7 to <8 inches difference cupSize = 'G'; } else if (cupDifference < 9) { // 8 to <9 inches difference cupSize = 'H'; } else if (cupDifference < 10) { // 9 to <10 inches difference cupSize = 'I'; } else if (cupDifference < 11) { // 10 to <11 inches difference cupSize = 'J'; } else { // 11 inches or more difference cupSize = 'K+ (Consult a specialist)'; } resultDiv.innerHTML = `

Your Estimated Bra Size:

Band Size: ${calculatedBand} Cup Size: ${cupSize} Full Bra Size: ${calculatedBand}${cupSize} Note: Bra sizing can vary between brands. This is an estimate. `; }

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