1
Measure Your Underbust
Wrap a soft measuring tape around your rib cage, directly underneath your breasts. Keep the tape level and comfortably snug.
Free & Easy to Use
Bra Size Calculator
Calculate your estimated bra size using your underbust and bust measurements. See your US, UK, EU and AU size equivalents.
Calculate Your Bra Size
Measure yourself with a soft measuring tape and enter your measurements below.
Your Estimated US Bra Size
32D
International Size Conversion
| Size System | Estimated Size |
|---|---|
| US | 32D |
| UK | 32D |
| EU | 70D |
| AU / NZ | 10D |
Sister Sizes
Sister sizes have similar cup volume but different band measurements.
How to Measure Your Bra Size
Accurate measurements are the most important part of getting a useful bra-size estimate.
2
Measure Your Bust
Measure around the fullest part of your bust. Keep the measuring tape level across your back and avoid pulling it too tightly.
3
Compare the Measurements
Enter both measurements into the calculator. The difference between your bust and band measurements helps estimate your cup size.
Tip:
For the most consistent measurement, stand naturally
and keep the measuring tape straight and level. Bra
sizing can vary between brands, so treat the calculator
result as a starting point.
Bra Size Conversion
Bra sizing systems use different band numbers and, in some cases, different cup-letter sequences.
| US | UK | EU | AU / NZ |
|---|---|---|---|
| 28A | 28A | 60A | 6A |
| 30B | 30B | 65B | 8B |
| 32C | 32C | 70C | 10C |
| 32D | 32D | 70D | 10D |
| 34D | 34D | 75D | 12D |
| 36DD | 36DD | 80E | 14DD |
| 38DDD | 38E | 85F | 16E |
Bra Cup Size Guide
The cup size is estimated from the difference between the bust and band measurements.
| Approx. Difference | US Cup | Example |
|---|---|---|
| 0–1 inch | AA | 32AA |
| 1–2 inches | A | 32A |
| 2–3 inches | B | 32B |
| 3–4 inches | C | 32C |
| 4–5 inches | D | 32D |
| 5–6 inches | DD / E | 32DD |
| 6–7 inches | DDD / F | 32DDD |
| 7–8 inches | G | 32G |
Frequently Asked Questions
Common questions about measuring and calculating bra size.
How accurate is a bra size calculator?
A bra size calculator provides an estimate based on
your measurements. Actual fit can vary because brands,
styles and sizing systems may use different standards.
Should I measure while wearing a bra?
A lightly lined or unpadded bra can make measuring
easier. Avoid heavily padded bras because padding can
affect your bust measurement.
What if I am between two sizes?
Consider trying your calculated size and a nearby
sister size. The best choice can also depend on the
bra style and how the band and cups fit your body.
Why are UK and US bra sizes different?
US and UK systems use different cup-letter sequences
at larger cup sizes. As a result, the same-looking
measurement does not always use the same cup letter
in both systems.
What are sister sizes?
Sister sizes are sizes with a similar cup volume but
different band measurements. For example, moving down
one band size generally requires moving up one cup size
to maintain a similar cup volume.
Can bra sizes vary between brands?
Yes. Different manufacturers can have different fits,
cuts and sizing conventions. Use the calculator as a
starting point and check the individual brand's size
guide whenever possible.
Free & Easy to Use
Bra Size Calculator
Calculate your estimated bra size using your underbust and bust measurements. See your US, UK, EU and AU size equivalents.
Calculate Your Bra Size
Measure yourself with a soft measuring tape and enter your measurements below.
Your Estimated US Bra Size
32D
International Size Conversion
| Size System | Estimated Size |
|---|---|
| US | 32D |
| UK | 32D |
| EU | 70D |
| AU / NZ | 10D |
Sister Sizes
Sister sizes have similar cup volume but different band measurements.
How to Measure Your Bra Size
Accurate measurements are the most important part of getting a useful bra-size estimate.
1
Measure Your Underbust
Wrap a soft measuring tape around your rib cage, directly underneath your breasts. Keep the tape level and comfortably snug.
2
Measure Your Bust
Measure around the fullest part of your bust. Keep the measuring tape level across your back and avoid pulling it too tightly.
3
Compare the Measurements
Enter both measurements into the calculator. The difference between your bust and band measurements helps estimate your cup size.
Tip:
For the most consistent measurement, stand naturally
and keep the measuring tape straight and level. Bra
sizing can vary between brands, so treat the calculator
result as a starting point.
Bra Size Conversion
Bra sizing systems use different band numbers and, in some cases, different cup-letter sequences.
| US | UK | EU | AU / NZ |
|---|---|---|---|
| 28A | 28A | 60A | 6A |
| 30B | 30B | 65B | 8B |
| 32C | 32C | 70C | 10C |
| 32D | 32D | 70D | 10D |
| 34D | 34D | 75D | 12D |
| 36DD | 36DD | 80E | 14DD |
| 38DDD | 38E | 85F | 16E |
Bra Cup Size Guide
The cup size is estimated from the difference between the bust and band measurements.
| Approx. Difference | US Cup | Example |
|---|---|---|
| 0–1 inch | AA | 32AA |
| 1–2 inches | A | 32A |
| 2–3 inches | B | 32B |
| 3–4 inches | C | 32C |
| 4–5 inches | D | 32D |
| 5–6 inches | DD / E | 32DD |
| 6–7 inches | DDD / F | 32DDD |
| 7–8 inches | G | 32G |
Frequently Asked Questions
Common questions about measuring and calculating bra size.
How accurate is a bra size calculator?
A bra size calculator provides an estimate based on
your measurements. Actual fit can vary because brands,
styles and sizing systems may use different standards.
Should I measure while wearing a bra?
A lightly lined or unpadded bra can make measuring
easier. Avoid heavily padded bras because padding can
affect your bust measurement.
What if I am between two sizes?
Consider trying your calculated size and a nearby
sister size. The best choice can also depend on the
bra style and how the band and cups fit your body.
Why are UK and US bra sizes different?
US and UK systems use different cup-letter sequences
at larger cup sizes. As a result, the same-looking
measurement does not always use the same cup letter
in both systems.
What are sister sizes?
Sister sizes are sizes with a similar cup volume but
different band measurements. For example, moving down
one band size generally requires moving up one cup size
to maintain a similar cup volume.
Can bra sizes vary between brands?
Yes. Different manufacturers can have different fits,
cuts and sizing conventions. Use the calculator as a
starting point and check the individual brand's size
guide whenever possible.