Bra Size Calculator

Enter your bust and band size to measure your exact bra size with this calculator. Step 1: Measure Band Size: Wrap the tape snugly under your bust, keeping it level and firm but not tight. Step 2: Measure Bust Size: Measure around the fullest part of your chest, keeping the tape straight and relaxed. Make sure the tape stays level, comfortable, and not too tight for the most accurate result.
Measure Band Size
Measure Bust Size
Units: inches (in)
Mode: Calculator
Country / Region Size Cup

Free & Instant Results

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Global Size Converter

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Real Fitting Standards

Why 70% of Women Wear the Wrong Bra Size

Surveys show that nearly 70–85% of women wear incorrectly fitted bras, often without realizing it.

The most common mistake is choosing a band that’s too large and a cup that’s too small, which leads to poor support and discomfort.

This widespread problem comes from a lack of size standardization band and cup measurements vary between countries and manufacturers, so a 34B from one brand may fit completely differently from another. Without consistent sizing, even women who measure carefully can end up in the wrong fit.

The signs of an incorrectly fitted bra are easy to spot: a band that digs into the torso or slides upward, red marks, shoulder or neck pain, breast overflow, or a center panel that doesn’t lie flat. These issues aren’t just cosmetic; they affect comfort, posture, and confidence every day. That’s why using an accurate, measurement-based bra size calculator helps eliminate guesswork and gives you a reliable starting point for finding your perfect size across brands and regions.

Bra Size Detail Guide

When it comes to bra sizing, two things matter most your band size and your cup size.
Think of the band as your foundation and the cup as your shape. Together, they determine how your bra feels, fits, and supports you.

Getting these right means no slipping straps, no tight bands, and no second-guessing your size.

Bra Size Calculator Co - Detail Guide

1. Bra Band Size

Bra sizing isn’t the same in every country. Different regions use their own systems for measuring the band size (the number part of your bra, like 32, 34, or 36).

Use this chart to compare international band size equivalents and find your match before shopping online or traveling abroad.

You can also use the Bra Size Converter on our site to check your full cup-to-band conversion instantly.

Alpha Size US / UK (inches) AU / NZ (inches) Suggested Band (inches)
XXS 28 10 23–24
XS 30 12 25–26
S 32 14 27–28
M 34 16 29–30
L 36 18 31–32
XL 38 20 33–34
XXL 40 22 35–36
3XL 42 24 37–38
4XL 44 26 39–40
5XL 46 28 41–42
Alpha Size FR / BE / ES (cm) EU (EN 13402) (cm) Suggested Band (cm)
XXS 75 60 58–62
XS 80 65 63–67
S 85 70 68–72
M 90 75 73–77
L 95 80 78–82
XL 100 85 83–87
XXL 105 90 88–92
3XL 110 95 93–97
4XL 115 100 98–102
5XL 120 105 103–107

📏 Measuring Mistakes to Avoid

Getting the right bra size starts with accurate measurements even small errors can change your result. Follow these simple do’s and don’ts to make sure your bust and band measurements are correct every time.

✅ Do This When Measuring

– Use a soft measuring tape not metal or rigid plastic. – Measure in front of a mirror to keep the tape level around your body. – Stand straight and relaxed; don’t hold your breath or pull in your stomach. – Keep the tape snug but comfortable, lying flat against the skin (not pressing in). – Take measurements without heavy or padded clothing. – Measure twice once without a bra and once in a light, non-padded bra for comparison. – Note both inches and centimeters if you plan to check international sizes.

❌ Avoid These Common Mistakes

– Don’t measure over thick clothes or padded bras it adds inches. – Don’t pull the tape too tight or too loose — both distort your size. – Don’t slouch, lift your arms, or lean while measuring. – Don’t round off numbers too early — even half an inch makes a difference. – Don’t skip re-measuring — your size can change due to weight, hormones, or posture. – Don’t compare your measurements with someone else’s — every body shape is unique.