Bust Size Calculator

Bust Size Calculator

function calculateBustSize() { var underBustInput = document.getElementById("underBustMeasurement").value; var fullBustInput = document.getElementById("fullBustMeasurement").value; var resultDiv = document.getElementById("bustSizeResult"); var underBustMeasurement = parseFloat(underBustInput); var fullBustMeasurement = parseFloat(fullBustInput); if (isNaN(underBustMeasurement) || isNaN(fullBustMeasurement) || underBustMeasurement <= 0 || fullBustMeasurement <= 0) { resultDiv.innerHTML = "Please enter valid positive numbers for both measurements."; return; } if (fullBustMeasurement 30, 30 -> 30, 31 -> 32 var bandSize = Math.round(underBustMeasurement / 2) * 2; if (bandSize < 28) { // Minimum common band size bandSize = 28; } // Calculate Cup Size var cupDifference = fullBustMeasurement – underBustMeasurement; var cupLetters = ['AA', 'A', 'B', 'C', 'D', 'DD', 'DDD/F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P']; var cupIndex = Math.floor(cupDifference); // 0-0.99 = AA, 1-1.99 = A, etc. var cupLetter; if (cupIndex = cupLetters.length) { cupLetter = cupLetters[cupLetters.length – 1] + "+"; // For very large sizes } else { cupLetter = cupLetters[cupIndex]; } resultDiv.innerHTML = "Your estimated bra size is: " + bandSize + cupLetter + ""; }

Understanding Your Bra Size: A Comprehensive Guide

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 an unflattering silhouette. Our Bust Size Calculator helps you get an accurate estimate, but understanding the measurements and how they translate into a bra size is key.

Why Correct Bra Size Matters

• Comfort: A well-fitting bra prevents digging straps, gaping cups, and uncomfortable pressure points.
• Support: Proper support reduces strain on your back and shoulders, especially for those with larger busts.
• Appearance: The right bra enhances your natural shape, improves posture, and makes clothes fit better.
• Breast Health: Adequate support can help prevent ligament stretching and discomfort during physical activity.

How to Measure Your Bust Accurately

For the most accurate results from our calculator, follow these steps carefully:

1. Gather Your Tools: You'll need a soft measuring tape and ideally, a non-padded bra that fits well (or no bra at all).
2. Measure Your Underbust (Band Size):
   • Stand upright and exhale fully.
   • Wrap the measuring tape snugly around your rib cage, directly under your bust. Ensure the tape is level all the way around your back.
   • Read the measurement in inches. This is your Underbust Measurement.
3. Measure Your Full Bust (Cup Size):
   • Stand upright with the measuring tape around the fullest part of your bust (usually across the nipples).
   • Make sure the tape is not too tight and doesn't compress your breasts. It should be level across your back.
   • Read the measurement in inches. This is your Full Bust Measurement.

Input these two measurements into the calculator above to get your estimated bra size.

Understanding Band and Cup Sizes

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

• Band Size: This number (e.g., 32, 34, 36) corresponds to the measurement around your rib cage. It provides the majority of the bra's support. Our calculator rounds your underbust measurement to the nearest even number, which is standard for US bra sizing.
• Cup Size: This letter (e.g., A, B, C, D) represents the difference between your full bust measurement and your underbust measurement. Each inch of difference typically corresponds to a cup size increment (1 inch = A, 2 inches = B, etc.).

Example Calculation

Let's say your measurements are:

• Underbust Measurement: 30.5 inches
• Full Bust Measurement: 34.8 inches

Using the calculator's logic:

• Band Size: 30.5 inches rounded to the nearest even number is 30.
• Cup Difference: 34.8 – 30.5 = 4.3 inches.
• Cup Size: A 4-inch difference typically corresponds to a D cup (0=AA, 1=A, 2=B, 3=C, 4=D).

Your estimated bra size would be 30D.

Important Considerations and Tips

• Sister Sizes: If your calculated size doesn't feel quite right, you might try a "sister size." For example, a 34B has a similar cup volume to a 32C or a 36A. When you go down a band size, you go up a cup size to maintain similar volume, and vice-versa.
• Brand Variations: Bra sizing can vary slightly between brands. Always try on bras before purchasing.
• Fit Test: When trying on a bra, ensure the band is snug and level across your back (it shouldn't ride up). The cups should fully contain your breasts without gaping or spilling over. The center gore (the part between the cups) should lie flat against your sternum.
• Re-measure Regularly: Your body changes over time due to weight fluctuations, hormonal shifts, and age. It's a good idea to re-measure your bust every 6-12 months.

This calculator provides a great starting point, but the best way to find your perfect bra is always to try on different styles and sizes to see what feels and looks best on you.