Bra Size Calculator: A Visual Guide to Finding Your Perfect Fit

Understanding Bra Sizing: Band + Cup

A bra size consists of two components:

1. Band Size: The number (e.g., 32, 34) represents your underbust measurement.

2. Cup Size: The letter (e.g., B, C) reflects the difference between your bust and underbust measurements  

(Visual suggestion: Infographic showing a tape measure around the torso for band size and across the bust for cup size.)

Step-by-Step Measurement Guide

Tools Needed

• Soft measuring tape

• Non-padded bra (or measure braless if self-supporting)

1. Measure Your Band Size

• Step: Wrap the tape snugly around your ribcage, just below your bust. Ensure it’s parallel to the floor.

• Calculation: Round to the nearest whole number. If odd, round up.
  (Example: 31 inches → 32 band) 

(Visual suggestion: Woman measuring underbust with tape, mirror showing proper alignment.)

2. Measure Your Bust Size

• Step: Measure around the fullest part of your bust while standing upright. For accuracy, lean forward 45 degrees to capture all breast tissue 

• Tip: Keep the tape loose enough to fit one finger underneath.

(Visual suggestion: Side-view diagram of tape placement at nipple level.)

3. Calculate Cup Size

Subtract your band size from your bust measurement. Use the chart below:

(Visual suggestion: Chart comparing differences to cup letters with examples.)

Using a Bra Size Calculator

Online calculators simplify the process by automating measurements. Popular options include:

1. Omni Calculator: Converts measurements into US, UK, or EU sizes 

2. A Bra That Fits: Uses six measurements (loose, snug, and tight underbust; standing, leaning, lying bust) for precision

3. BraSizechart.one Fit Finder: Asks lifestyle questions to recommend styles 

(Visual suggestion: Screenshot of a calculator interface with input fields for band and bust.)

Sister Sizing: When Your Size Isn’t Available

Sister sizes share the same cup volume but adjust the band and cup proportionally. For example:

• 34C → Sister sizes: 32D (smaller band, larger cup) or 36B (larger band, smaller cup)

(Visual suggestion: Table showing sister sizes for common measurements.)

How to Check Your Bra Fits Perfectly

1. Band: Should sit snugly on the loosest hook, level front-to-back. No riding up!

2. Cups: No spillage or gaps. The center gore must lie flat against your sternum .

3. Straps: Adjust to fit one finger underneath—they shouldn’t dig in or slip.

(Visual suggestion: Side-by-side images of a poorly fitted vs. well-fitted bra highlighting band, cups, and straps.)

When to Re-Measure

• Weight fluctuations, pregnancy, or hormonal changes.

• Every 6–12 months for natural body shifts 

Final Tips

• Try Before Buying: Sizes vary by brand. Always test bras in-store or order multiple sizes online.

• Prioritize Comfort: A bra shouldn’t cause pain, redness, or restrict breathing.

(Visual suggestion: Collage of diverse women confidently wearing well-fitted bras.)