Advanced Bra Size Calculator | Find Your Perfect Fit

Thinkforu.org Bra Size Calculator

Get your perfect fit with our comprehensive bra size calculator. Enter your measurements below for an accurate size recommendation.

Your Measurements

Your Results

Your Recommended Bra Size

Enter your measurements to calculate your bra size.

Measurement Tips:

Measure your underbust directly under your breasts, keeping the tape measure snug but not tight.

Measure around the fullest part of your bust while wearing a non-padded bra.

Stand straight with your arms at your sides when taking measurements.

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Comprehensive Bra Fitting Guide

Why Proper Bra Fitting Matters

Finding the right bra size is essential for comfort, support, and overall health. An ill-fitting bra can cause back pain, shoulder strain, poor posture, and even skin irritation. Studies show that over 80% of women wear the wrong bra size, often because they've never been properly measured.

How to Take Accurate Measurements

For the most accurate results, follow these steps:

Wear a non-padded bra or no bra when measuring.
Use a soft measuring tape and keep it parallel to the ground.
Underbust measurement: Measure directly under your breasts, around your ribcage. The tape should be snug but not digging into your skin.
Bust measurement: Measure around the fullest part of your bust, usually at nipple level. The tape should be loose enough to not compress your breast tissue.
Stand with good posture and arms at your sides when measuring.

Understanding Sister Sizes

Sister sizes are bra sizes with the same cup volume but different band sizes. If your calculated size doesn't feel right, you might find a better fit with a sister size. For example, if 34C feels too tight in the band but the cup fits well, try 36B (sister size up). If the band is too loose but the cup fits, try 32D (sister size down).

Signs of a Good Fit

A properly fitting bra should:

Have a band that sits horizontally around your body and doesn't ride up
Have cups that fully contain your breast tissue without spillage or gaping
Have a center gore (the part between the cups) that sits flat against your sternum
Have straps that stay in place without digging into your shoulders
Feel comfortable when you move, breathe, and sit

Frequently Asked Questions

How often should I measure my bra size?

It's recommended to measure your bra size every 6-12 months, or whenever you experience significant weight changes, pregnancy, menopause, or hormonal changes. Your body naturally changes over time, and your bra size may change with it.

Why does my bra size vary between brands?

Different brands use different sizing standards and design patterns. Some brands may run smaller or larger than others. This is normal and why it's helpful to know your sister sizes when shopping across different brands.

What if I'm between sizes?

If you're between band sizes, it's usually better to go with the smaller band size for better support, as bands tend to stretch over time. If you're between cup sizes, choose the larger cup to ensure all breast tissue is contained comfortably.

How can I tell if my current bra doesn't fit properly?

Signs of a poor fit include: straps that dig in or slip off, a band that rides up your back, cups that wrinkle or cause spillage, underwires that poke or don't sit flat against your sternum, and general discomfort or pain while wearing the bra.

Does the calculator work for all breast shapes?

This calculator provides a starting point for all breast shapes, but individual factors like breast shape, spacing, and firmness can affect your ideal fit. Those with very pendulous breasts, very wide-set breasts, or asymmetrical breasts may need to try different styles to find their best fit.

What's the difference between US, UK, and EU sizing?

Different regions use different sizing systems. US sizing typically uses letters (A, B, C, D, DD, DDD, etc.), UK sizing follows a different progression after D (DD, E, F, FF, G, etc.), and EU sizing uses numbers. Our calculator provides US sizing, but you can convert to other systems using size charts from specific brands.

Bra Size Calculator - Find Your Perfect Fit