How to Measure Your Bra Size

Get accurate measurements in just 2 minutes. All you need is a soft measuring tape and our step-by-step guide.

2 min

Total time

Measurements

100%

Private

What You'll Need

Soft measuring tape - The flexible kind used for sewing (not a metal tape measure)
Unpadded bra or no bra - Padded bras can add inches and throw off your measurement
A mirror - Helps ensure the tape is level

Interactive Measurement Tool

This takes about 2 minutes

Let's Find Your Perfect Fit

Accurate measurements are the foundation of a great-fitting bra. We'll guide you through each step.

2 min

Quick process

Measurements

100%

Private

Step-by-Step Instructions

Measure Your Band Size

Wrap the measuring tape snugly around your ribcage, directly under your bust. The tape should be level and parallel to the floor all the way around.

Tips for accuracy:

• Keep your arms relaxed at your sides
• Make sure the tape is snug but not tight
• Round to the nearest even number (31" becomes 30" or 32")

Measure Your Bust Size

Wrap the tape loosely around the fullest part of your bust. Don't pull the tape tight - let it rest gently against your skin.

Tips for accuracy:

• Stand up straight with good posture
• Keep the tape level all the way around
• Don't compress your bust - keep it loose

Calculate Your Cup Size

Subtract your band measurement from your bust measurement. The difference tells you your cup size.

Cup size chart:

E/DDD

8"+

G+

Important Notes

Your calculated size is a starting point

• Sizes vary significantly between brands
• Your shape affects fit as much as size
• Bodies change - remeasure every 6-12 months
• Consider sister sizes if the band feels too tight or loose

Related Guides

Sister Sizes Explained

Learn how sister sizes work and when to use them. Same cup volume, different band sizes.

Read guide

Bra Types Explained: Complete Visual Guide

12+ bra types explained — from t-shirt to balconette to plunge. Which style works best for your shape and needs.

Read guide

When to Replace Your Bras (Signs & Timeline)

8 signs your bra is worn out plus a timeline by bra type. Care tips to extend lifespan.

Read guide

Frequently Asked Questions

How often should I measure my bra size?

You should re-measure every 6 to 12 months, or after any significant body change such as weight loss or gain, pregnancy, breastfeeding, or hormonal changes. Many women find their size changes more often than they expect.

Should I measure with or without a bra on?

Measure wearing a thin, non-padded bra or no bra at all. Padded or push-up bras will add extra volume and give inaccurate measurements. A thin t-shirt bra or bralette is acceptable if you prefer not to measure without one.

What if my band measurement is an odd number?

Round to the nearest even number. If you are between two even numbers, try both sizes. If you prefer a snugger fit, round down. If you prefer more room, round up. Most bra bands are only available in even numbers (30, 32, 34, etc.).

Why is my measured size different from what I usually wear?

Bra fittings reveal that most women are wearing the wrong size — typically a band too loose and a cup too small. Common reasons include never having a professional fitting, size changes over time that went unnoticed, and brand-to-brand variation in how a 34DD is cut. Trust the tape measure over habit.

Can I measure myself or do I need someone to help?

You can absolutely measure yourself. Stand in front of a mirror to make sure the tape is level. For the bust measurement, lean forward slightly to capture your full volume. If you find it difficult to keep the tape level, asking someone to help can improve accuracy.