How to Use the Bra Size Calculator

A Bra Size Calculator is an online tool that helps you determine your correct bra size based on two key measurements: underbust and bust circumference. Using accurate sizing is crucial for comfort, posture, and confidence.

Why Use a Bra Size Calculator?

Many people wear the wrong bra size, often due to outdated fittings or guessing. This calculator provides a quick, easy way to estimate your proper bra size from the comfort of home.

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How It Works

The calculator uses two inputs:

• Underbust (Band Size): Measured directly under your bust, in inches.
• Bust Measurement: The fullest part of your chest, also in inches.

It then:

1. Rounds the band size to the nearest even number (common in US sizing).
2. Calculates the difference between bust and band measurements.
3. Assigns a cup size based on the difference:
   • 1 inch = A
   • 2 inches = B
   • 3 inches = C
   • and so on.

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How to Measure

• Underbust: Use a soft tape measure, exhale, and measure snugly around your ribcage right under your bust.
• Bust: Measure loosely around the fullest part of your bust, with the tape horizontal and even.

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Step-by-Step Instructions

1. Enter your underbust measurement in inches (e.g., 30).
2. Enter your bust measurement in inches (e.g., 35).
3. Click the “Calculate Bra Size” button.
4. The result will show a size like 34C or 36DD.

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Example

• Underbust: 31 inches → rounded to 32
• Bust: 36 inches
• Difference: 4 inches → Cup Size = D

Result: 32D

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Bra Size Calculator FAQ

What measurements do I need?

You need your underbust and bust measurements in inches.

How accurate is this calculator?

It provides a good estimate based on U.S. sizing but may vary depending on brand and body shape.

What if I get “Unknown” as a result?

This means the cup size is outside the standard range. Double-check your measurements or consult a professional.

Can I use cm instead of inches?

This calculator currently only supports inches. You can convert cm to inches (1 inch = 2.54 cm) before using it.

Why is the band size rounded?

Most brands use even-numbered band sizes (e.g., 32, 34, 36), so rounding ensures consistency with common sizing.