AixKit
All-in-One Online Calculators
AixKit
All-in-One Online Calculators
The Bra Size Calculator is a free online tool that helps you compute results quickly and accurately — no software installation needed. Enter your values and get the answer instantly in your browser.
AixKit offers 200+ free browser-based calculators and tools with no installation, no account, and no usage limits. The Bra Size Calculator runs entirely in your browser — your data is never sent to a server. Works on desktop, tablet, and mobile.
The Bra Size Calculator lets you compute results based on the values you enter. Designed for accuracy, speed, and ease of use — no specialist knowledge required.
Enter your values in the fields provided and click the calculate button. Results appear instantly. You can adjust inputs and recalculate as many times as needed.
Yes — completely free. No account, no subscription, and no installation required. It runs directly in your web browser on any device.
Yes. All calculations run locally in your browser. No data is sent to any server, stored, or shared.
Wearing the right bra size is essential for comfort, support, posture, and confidence. Unfortunately, studies show that over 80% of women wear the wrong bra size, often due to confusion about sizing systems, fluctuating body changes, or inaccurate self-measurement. Our Bra Size Calculator simplifies this process by helping you determine your accurate bra size based on key measurements: band and bust.
This in-depth guide explains how bra sizing works, how to take your own measurements, how our calculator works, and how to choose the best style for your size and shape. Whether you’re shopping for everyday bras, maternity wear, or sports bras, this resource will help you find your true fit and feel more confident in your choices.
Bra sizes are composed of two key elements:
A size 34B means the wearer has a 34-inch band size and a B cup (a 2-inch difference between band and bust).
Our Bra Size Calculator simplifies the measuring process by guiding you through two quick steps:
The calculator then uses standard conversion formulas to determine your correct band and cup size, taking into account rounding rules and regional sizing standards (e.g., US, UK, EU).
If the number is even, add 4 inches. If it’s odd, add 5 inches. This gives you your band size.
Subtract the band measurement from the bust measurement:
If your band measures 31", round to 32. Add 4 = 36 band size.
If your bust is 38", then 38 - 36 = 2" difference = B cup.
Your bra size is 36B.
Always check the sizing system used by the brand you're shopping from.
Solution: Adjust the band size. A snug but comfortable fit is ideal on the loosest hook.
Solution: Go up or down a cup size. Check if the shape matches your breast type (full-on-top vs. full-on-bottom).
Solution: Ensure the cup size is large enough and the wire fully encases breast tissue.
Yes. All you need is a soft measuring tape and a mirror. Make sure to measure without heavy clothing or padded bras.
Wear a lightly lined, non-padded bra or go braless to get the most accurate results.
Ideally every 6–12 months or after about 100 washes. Bras lose elasticity and support over time.
Yes. Even a few pounds of body weight change can affect band or cup size.
Use conversion charts or select “international size” options in online stores to align regional differences.
Wearing the correct bra size transforms how you feel and look. Our Bra Size Calculator makes it easy to take the guesswork out of sizing, guiding you toward better comfort, support, and style. Whether you're replacing a daily staple or shopping for a special occasion, the right fit ensures you look and feel your best.
Take a few minutes to use the calculator, recheck your measurements, and browse styles made for your unique body. Once you understand your true size, shopping becomes less frustrating and far more empowering.
A well-fitted bra is not a luxury—it's a necessity. Start with accurate measurements and say goodbye to discomfort, constant adjusting, and sizing confusion. Find your perfect fit now!