Bra Size Guide Calculator

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Professional Bra Size Calculator

Inches (in) Centimeters (cm)

Your Recommended Size

function calculateBraSize() { var underbust = parseFloat(document.getElementById('underbust').value); var bust = parseFloat(document.getElementById('bust').value); var unit = document.getElementById('unitSelect').value; var resultArea = document.getElementById('resultArea'); var sizeOutput = document.getElementById('sizeOutput'); var sizeDetail = document.getElementById('sizeDetail'); if (!underbust || !bust || underbust <= 0 || bust <= 0) { alert('Please enter valid measurements for both Underbust and Bust.'); return; } if (bust <= underbust) { alert('Bust measurement must be larger than Underbust measurement.'); return; } // Convert CM to Inches for standard calculation logic var uInches = unit === 'cm' ? underbust / 2.54 : underbust; var bInches = unit === 'cm' ? bust / 2.54 : bust; // Step 1: Calculate Band Size // Common industry standard: If even, add 4. If odd, add 5. var bandSize; var roundedUnderbust = Math.round(uInches); if (roundedUnderbust % 2 === 0) { bandSize = roundedUnderbust + 4; } else { bandSize = roundedUnderbust + 5; } // Step 2: Calculate Cup Size (Difference between Bust and Calculated Band) var diff = Math.round(bInches – bandSize); var cup = ""; if (diff = 10) cup = "J+"; resultArea.style.display = "block"; sizeOutput.innerText = bandSize + cup; sizeDetail.innerText = "Based on an underbust of " + underbust + unit + " and bust of " + bust + unit + "."; }

The Ultimate Bra Size Guide: How to Get the Perfect Fit

Finding the right bra size is more than just a matter of comfort; it's essential for posture, confidence, and garment aesthetics. Statistics suggest that nearly 80% of women are wearing the incorrect bra size. This guide and calculator use the standard industry method to help you find your starting point.

Step 1: Measure Your Underbust (The Band)

Wrap a soft measuring tape around your ribcage, directly under your bust. Ensure the tape is level and snug, but not digging in. If you are using inches and the result is an even number, add 4 inches. If it is odd, add 5 inches. This calculation yields your Band Size.

Step 2: Measure Your Overbust (The Cup)

Wrap the measuring tape around the fullest part of your chest. Do not pull the tape tight; it should rest lightly against your skin. Keep the tape parallel to the floor.

Step 3: Calculate the Difference

Subtract your calculated Band Size from your Bust measurement. Each inch of difference represents one cup size:

  • 0-1 inch: A Cup
  • 2 inches: B Cup
  • 3 inches: C Cup
  • 4 inches: D Cup
  • 5 inches: DD Cup
  • 6 inches: DDD/F Cup

Fitting Tips and Troubleshooting

While a calculator provides a great baseline, different brands and styles (like balconette, plunge, or sports bras) may fit differently. Check these three signs of a good fit:

  1. The Band: Should be level all the way around. If it rides up in the back, the band is too large.
  2. The Gore: The center part of the bra between the cups should lie flat against your chest bone.
  3. The Cups: There should be no "quad-boob" (spillage) over the top, nor any gaping or wrinkles in the fabric.

Example Calculation

If your underbust measurement is 30 inches, your band size is 34 (30 + 4). If your bust measurement is 37 inches, the difference is 3 inches (37 – 34 = 3). A 3-inch difference corresponds to a C cup. Your estimated bra size is 34C.

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