Find Your Perfect Bra Size Simple, Accurate Calculator
Ready to find the perfect fit? Our easy-to-use calculator will guide you step by step.
Calculate Bra Size
How to Take Bra Measurements
Preparation for Measurement
Measuring Tape
Use a soft, flexible measuring tape.
Measurement Unit
Choose inches or centimeters.
What to Wear
Wear a non-padded bra or no bra.
Mirror (Optional)
To your measuring tape is level.
Things to consider
- What to Wear: For the best results, wear a non-padded bra or a snug-fitting tank top. Avoid bulky or padded clothing.
- When to Measure: Measure when your breasts are their most natural state, ideally a few days after your menstrual cycle ends to account for any size fluctuation.
- Where to Measure: Find a comfortable, private space with a mirror. This helps ensure the measuring tape is level and correctly positioned.
- Setting Up the Environment: Ensure the room is well-lit and you have a flat surface to stand on. Keep a notepad handy to jot down your measurements.
Step 1: Measure Your Band Size
Wrap the measuring tape snugly around your ribcage, directly under your bust. Make sure the tape is level and straight across your body.
Tip: If the measurement falls between two numbers, round it to the nearest whole number.
Step 2: Measure Your Bust Size
Wrap the measuring tape around the fullest part of your bust. Ensure the tape is parallel to the ground and is not too tight or too loose.
Tip: Round the measurement to the nearest whole number if it falls between two values.
Step 3: Calculate Your Cup Size
Subtract your band size (Step 1) from your bust size (Step 2). The difference determines your cup size. Each inch difference typically corresponds to a cup size:
- 1 inch difference = A cup
- 2 inches difference = B cup
- 3 inches difference = C cup, and so on.
Refer to the cup size chart below corresponding to your country's sizing standards
Cup Size Chart
| Difference in (cm) | UK | US | EU | FR | AU |
|---|---|---|---|---|---|
| <1 | AA | AA | AA | AA | AA |
| 1 (2.5) | A | A | A | A | A |
| 2 (5.1) | B | B | B | B | B |
| 3 (7.6) | C | C | C | C | C |
| 4 (10.2) | D | D | D | D | D |
| 5 (12.7) | DD | DD/E | E | E | DD |
| 6 (15.2) | E | DDD/F | F | F | E |
| 7 (17.8) | F | DDDD/G | G | G | F |
| 8 (20.3) | FF | H | H | H | G |
| 9 (22.9) | G | I | I | I | H |
| 10 (25.4) | GG | J | J | J | I |
| 11 (27.9) | H | K | K | K | J |
| 12 (30.5) | HH | L | L | L | K |
| 13 (33.0) | J | M | M | M | L |
| 14 (35.6) | JJ | N | N | N | M |
| 15 (38.1) | K | O | O | O | N |
| 16 (40.6) | KK | P | P | P | O |
| 17 (43.2) | L | Q | Q | Q | P |
| 18 (45.7) | M | R | R | R | LL |
Step 4: Use our Bra Size Calcualtor
Start by using our online bra size calculator available on the left side of your screen. With your band and bust measurements in hand, enter these values into the calculator. Make sure to select your preferred measurement unit—either inches or centimeters. The calculator will analyze your measurements and provide you with the ideal bra size tailored to your body.
Self Calculation
If you prefer to manually calculate your bra size, simply combine the band size you measured earlier with the cup size obtained from the chart. For example, if your measured band size is 38 and you have determined a cup size of F from the chart, then your complete bra size would be 38F. This manual method allows you to double-check the calculator's accuracy and ensures a perfect fit.
Special Note on Traditional Calculation Methods
Some brands use a traditional calculation method to determine band size, which involves adding 4 inches to your actual underbust measurement. For instance, if your actual band measurement is 34 inches, these brands would calculate your band size as 38. This method can vary significantly from modern fitting practices, so it's essential to be aware of the sizing method used when selecting bras from different brands.
Step 5: Try on Bras for Fit
Once you have your calculated bra size, try on different bras in that size to check for comfort and support. Remember, bra sizing can vary slightly between different brands and styles.
Frequently Asked Questions
- Band Size: Measure around your ribcage, just under your bust. Make sure the tape is snug but not too tight.
- Bust Size: Measure around the fullest part of your bust, making sure the tape is parallel to the floor and not too loose.
Why Our Bra Size Calculator is the Best
Most Accurate Measurements
Get the most precise bra size calculations based on your unique measurements.
Brand-Specific Sizing
We consider brand-specific sizing to give you the best fit for each one.
Style Recommendations
Take our 2-minute quiz and get bra styles tailored to your preferences.
Bra Size Conversion
Convert your size easily across different brands with our conversion tool.
Top Brand Recommendations
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