Bras Measurement Calculator

Bra Measurement Calculator

Measure around your rib cage, directly under your bust, snug but not tight.

Measure around the fullest part of your bust, usually over the nipples, keeping the tape level.

Inches Centimeters

function calculateBraSize() { var underBustSnug = parseFloat(document.getElementById('underBustSnug').value); var bustFullest = parseFloat(document.getElementById('bustFullest').value); var measurementUnit = document.getElementById('measurementUnit').value; var braResultDiv = document.getElementById('braResult'); if (isNaN(underBustSnug) || isNaN(bustFullest) || underBustSnug <= 0 || bustFullest <= 0) { braResultDiv.style.display = 'block'; braResultDiv.style.backgroundColor = '#f8d7da'; braResultDiv.style.borderColor = '#f5c6cb'; braResultDiv.style.color = '#721c24'; braResultDiv.innerHTML = 'Please enter valid positive numbers for both measurements.'; return; } // Convert to inches if unit is cm if (measurementUnit === 'cm') { underBustSnug /= 2.54; bustFullest /= 2.54; } if (bustFullest <= underBustSnug) { braResultDiv.style.display = 'block'; braResultDiv.style.backgroundColor = '#f8d7da'; braResultDiv.style.borderColor = '#f5c6cb'; braResultDiv.style.color = '#721c24'; braResultDiv.innerHTML = 'Bust measurement must be greater than underbust measurement.'; return; } // Calculate Band Size (US/UK method: round snug measurement to nearest even number) var bandSize = Math.round(underBustSnug); if (bandSize % 2 !== 0) { bandSize++; // If odd, add 1 to make it even } // Common band sizes are 30, 32, 34, etc. If snug is 29, band is 30. If snug is 31, band is 32. // If snug is 30, band is 30. If snug is 32, band is 32. // Calculate Cup Size var cupDifference = bustFullest – bandSize; // Difference in inches var cupSizes = ["AA", "A", "B", "C", "D", "DD", "DDD/F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P"]; var cupIndex = Math.floor(cupDifference); if (cupIndex = cupSizes.length) { cupIndex = cupSizes.length – 1; // Cap at the largest defined cup size } var cupSize = cupSizes[cupIndex]; braResultDiv.style.display = 'block'; braResultDiv.style.backgroundColor = '#e9f7ef'; braResultDiv.style.borderColor = '#d4edda'; braResultDiv.style.color = '#155724'; braResultDiv.innerHTML = 'Your estimated bra size is: ' + bandSize + cupSize + ' (US/UK)'; }

Understanding Your Bra Size: A Comprehensive Guide

Finding the right bra size is crucial for comfort, support, and the overall appearance of your clothing. Many women wear the wrong size, leading to discomfort, poor posture, and an ill-fitting silhouette. This guide will help you understand how bra sizing works and how to accurately measure yourself at home.

Why Accurate Bra Measurement Matters

A well-fitting bra can make a significant difference in your daily life. It provides proper support, alleviates back and shoulder pain, and enhances your natural shape. Conversely, an ill-fitting bra can cause:

• Shoulder indentations from straps digging in.
• Back pain due to lack of support.
• Breast tissue spilling out of the cups or gaping.
• The band riding up your back.
• Overall discomfort and irritation.

How to Measure Your Bra Size at Home

You'll need a soft measuring tape and ideally, a non-padded bra or no bra at all. Follow these two key steps:

Step 1: Measure Your Band Size (Underbust)

1. Position the Tape: 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.
2. Take the Measurement (Snug): Exhale fully to get the smallest possible measurement. This is your "underbust snug" measurement. Note this number.
3. Take the Measurement (Tight – Optional but Recommended): For a more precise band size, you can also take a "underbust tight" measurement by pulling the tape as tight as possible, almost uncomfortably so. This helps determine the smallest band you can comfortably wear.

Calculator Logic for Band Size: Our calculator uses your "underbust snug" measurement. It rounds this number to the nearest whole number. If the result is an odd number, it adds 1 to make it an even number, as most bra bands are sold in even numbers (e.g., 30, 32, 34).

Step 2: Measure Your Bust Size (Fullest Part)

1. Position the Tape: Wrap the measuring tape around the fullest part of your bust, usually over your nipples. Ensure the tape is level across your back and not too tight or too loose.
2. Take the Measurement: Breathe normally and note this number.

Understanding Cup Size

Your cup size is determined by the difference between your bust measurement and your calculated band size. Each inch of difference typically corresponds to one cup size increment.

• 0-1 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 in UK sizing)
• 6 inches difference: DDD (or F in UK sizing)
• And so on…

Example Calculation

Let's say your measurements are:

• Underbust Snug: 32.5 inches
• Bust Fullest: 38 inches

Band Size: The calculator takes 32.5 inches, rounds it to 33, then adds 1 to make it an even number: 34.

Cup Size: The difference between your bust (38 inches) and your calculated band (34 inches) is 4 inches. A 4-inch difference corresponds to a D cup.

Your estimated bra size would be 34D.

Important Considerations and Tips

• Bra Sizing Systems: The calculator provides US/UK sizing. European (EU) sizing uses different band numbers (e.g., 70, 75, 80) and sometimes different cup progressions.
• Brand Variation: Bra sizes can vary slightly between brands, much like clothing sizes. Use your calculated size as a starting point.
• Try On Bras: The best way to find your perfect fit is to try on bras. Pay attention to how the band, cups, and straps feel.
• The Band is Key: The band provides about 80% of the support. It should be snug and level across your back, not riding up. You should be able to fit two fingers comfortably under the band.
• Cups Should Enclose: Your breasts should fully fill the cups without spilling over the top or sides, and without any gaping.
• Straps are for Support, Not Lift: Straps should feel comfortable and not dig into your shoulders. If they are doing most of the lifting, your band is likely too loose.
• Re-measure Regularly: Your body changes over time due to weight fluctuations, pregnancy, hormonal shifts, and age. Re-measure yourself every 6-12 months.

While this calculator provides a great starting point, a professional bra fitting can offer personalized advice and help you discover the best styles for your body shape. Happy bra shopping!