How do I take my measurements correctly?

For the band size, measure snugly around your ribcage, directly under your bust. For the bust size, measure around the fullest part of your bust. Ensure the measuring tape is level and not too tight. It's best to do this while wearing a non-padded bra or no bra.

Is this calculator's result guaranteed to be perfect?

No. This calculator provides a very good starting point based on standard sizing formulas. However, bra sizes can vary significantly between different brands and styles. You should always use this result as a guide and try on bras to find the best fit for your unique body shape.

What is a 'sister size'?

Sister sizes are alternate bra sizes where the cup volume is the same. For example, a 34C has the same cup volume as a 32D and a 36B. If a bra's band feels too tight but the cup fits well, you can try going up one band size and down one cup size (e.g., from 34C to 36B).

Bra Size Calculator | Find Your Perfect Fit

How Does This Work?

This calculator determines your estimated bra size using a common measurement-based method. Remember, this is a starting point, as brand sizing can vary.

1. Calculate Your Band Size: Your band size is based on your underbust measurement. The calculator takes your measurement, converts it to inches if needed, and rounds it up to the nearest even number. This forms the number part of your bra size (e.g., 34, 36).
2. Calculate Your Cup Size: The cup size is determined by the difference between your bust measurement and your calculated band size. Each inch of difference corresponds to a letter in the cup size alphabet (1 inch = A, 2 inches = B, 3 inches = C, and so on).
3. Provide International Conversions: Once your US/UK size is determined, the calculator uses standard conversion charts to show you your estimated equivalent size in other major systems, like European (EU) and Australian/New Zealand (AUS/NZ).

The Surprising History of the Modern Bra

For centuries, women wore restrictive corsets made of whalebone and stiff fabric. The first steps toward a modern bra came in the late 19th century, but the breakthrough is often credited to a New York socialite named **Mary Phelps Jacob** in 1914.

Preparing for a debutante ball, she found that her new, sheer evening gown was ruined by the poky whalebone of her corset. In a moment of inspiration, she and her maid took two silk handkerchiefs, some pink ribbon, and a cord, and fashioned them into a simple, soft, and lightweight alternative. Her friends loved it and wanted their own. Realizing she had a viable product, she patented her "Backless Brassiere." While she soon sold the patent to the Warner Brothers Corset Company for a small sum, her invention marked the beginning of the end for the corset and laid the foundation for the comfortable, modern bra industry we know today.

Explore More Related Tools

While you're here, check out some of our other popular health and lifestyle calculators:

Clothing & Shoe Size Converter: For all your other international sizing needs.
BMI Calculator: A key indicator of your overall health status.
Ideal Weight Calculator: Find a healthy weight range for your height.
Body Fat Calculator: Understand your body composition.
Pregnancy Due Date Calculator: An essential tool for expecting parents.
Calorie Calculator: Manage your nutrition.
Water Intake Calculator: Ensure you're staying hydrated.
Sleep Calculator: Optimize your sleep.
Unit Converter: Convert between inches and centimeters.
Time Zone Converter: A tool for travel planning.

Frequently Asked Questions (FAQ)

What are the signs of a poor-fitting bra?

Common signs include: the band riding up your back, straps digging into your shoulders, spillage over the top or sides of the cups, or the center panel not sitting flat against your sternum. A well-fitting bra should feel supportive and comfortable.

Why do my bra sizes differ so much between brands?

Unfortunately, there is no legally enforced universal standard for bra sizing. Each brand uses its own models and patterns, which can lead to significant inconsistencies. That's why it's crucial to use a calculator as a starting point, but always try on bras before buying if possible.

How often should I re-measure myself?

It's a good idea to re-measure yourself for a bra fitting about once a year, or anytime you experience significant weight changes, pregnancy, or have been breastfeeding. Your body changes over time, and your bra size can too.

Bra Size Calculator

Your Estimated Bra Size: