Bra Sizing Basics: How Sizes Work, Measuring and Converting
Every bra size is two facts: a band from the snug measurement under the bust, and a cup that counts the inches between that and the fullest part. These guides explain the system, show you how to measure in a minute, and translate a size between the US, UK, Australia and Europe.
Understand bra sizes
How Do Bra Sizes Work? Band, Cup and Country ExplainedBra sizes work in two parts.
Bra Cup Letters Explained: What A, B, C and DD Really MeanBra cup letters explained: a cup letter is the difference between your bust and your band measurement, with each inch adding one letter: 1 inch is an A, 2 is a B, 3 is a C, 4 is a D.
Sister Size Chart: Bra Sizes With the Same Cup VolumeIn a sister size chart, bra sizes are grouped by cup volume: one band down with one cup up, or one band up with one cup down, holds about the same amount.
What Is the Biggest Bra Size? Why the Band DecidesThere is no single biggest bra size.
Average Bra Size in the US and UK, and Why It MisleadsThere is no official average bra size.
Is 34C Big? How to Tell if a Bra Size Is BigA 34C is a modest size: it holds two cup steps less than the often-quoted US average of 34DD.
Bra Size Chart: Every Band and Cup in US, UK, AU, EU and FRThis bra size chart shows the same size in five systems side by side: find the band and cup you know, then read across to the country you need.- Every Bra Size, A to KOne page for each common bra size, bands 28 to 44, with sister sizes and the size in every country's system.
Cup letters
What Is a B Cup? Size, Measurements and Sister SizesA B cup means the bust measures about 2 inches (5 cm) more than the band: a 34B has a bust of about 36 inches.
What Is a C Cup? Measurements, Volume and Sister SizesA C cup means the bust measures about 3 inches (8 cm) more than the band, so a 34C has a bust of about 37 inches.
What Is a D Cup? Is It Big? Measurements by BandA D cup means the bust measures about 4 inches (10 cm) more than the band: a 34D has a bust of about 38 inches.
What Is a DD Cup? DD vs E and Sizes by BandA DD cup means the bust measures about 5 inches (13 cm) more than the band: a 34DD has a bust of about 39 inches.
What Is an E Cup? UK, US and EU E ExplainedAn E cup is a different size depending on where the bra was made: a UK or Australian E is a 6-inch bust-to-band difference (US DDD, EU F), a European E is the UK DD (5 inches), and a US tag that says E usually means DD.
Measure
How to Measure Bra Size at Home in Two MeasurementsHere is how to measure bra size: take a snug tape measurement around your ribcage just under the bust, then a loose one around the fullest part of the bust.
How to Measure Bra Size Without a Tape MeasureTo measure your bra size without a tape measure, wrap a ribbon, string or phone charger cable snugly under your bust, mark where the end meets, then lay it flat against a ruler or a printed tape.
How to Measure Bra Size Without a Bra (Soft or Settled Breasts)To measure without a bra, take the snug underbust while standing, then the bust twice: standing upright, and leaning forward at 90 degrees so the breasts hang naturally.- Printable Measuring TapeNo tape measure? Print one true to size in inches or centimeters, cut out the strips and measure for a bra size at home.
UK Bra Size CalculatorMeasure snugly under your bust and loosely around the fullest part, in centimetres or inches.
Australian Bra Size CalculatorMeasure snugly under your bust and loosely around the fullest part in centimetres.
Convert between countries
Bra Size Conversion Chart for US, UK, AU, EU and FRUse this bra size conversion chart to turn a size from one country into another: pick the system on the tag, enter the band and cup, and read the result.
Bra Size in CM: Measure in Centimeters and Read EU SizesTo find your bra size in centimeters, measure the snug underbust and the bust in cm.
UK to US Bra Size Converter and GuideTo convert a UK to US bra size, keep the band number and change only the cup above DD: UK E becomes US DDD, UK F becomes US G and UK FF becomes US H.
US to UK Bra Size Converter and GuideTo convert a US to UK bra size, keep the band and translate only cups above DD: US DDD becomes UK E, US G becomes UK F and US H becomes UK FF.
Australian Bra Size Conversion to US, UK and EUFor an Australian bra size conversion, add 22 to the AU band to get the US or UK band, and keep the cup letter up to DD.
International Bra Size Conversion: EU and French SizesFor an international bra size conversion from European sizing, turn the EU band into inches (EU 70 is 32, EU 75 is 34, EU 80 is 36) and translate the cup above D.
Get the size in about a minute
Measure with a tape, read a bra tag, or start from a clothes size. You get the size in US, UK, AU and EU sizing, with sister sizes. Free, and nothing leaves your phone.
Open the bra size calculatorBuying a gift? Keep her sizes together on her size card.