How do I calculate my bra size?

Measure your underbust/band measurement and your bust measurement , then use the difference between them to determine your cup size. Our bra size calculator uses these measurements to estimate your bra size.

Are online bra size calculators accurate?

A bra size calculator provides a starting size , but it cannot guarantee a perfect fit for every bra. Sizing can vary between brands, styles, fabrics, and sizing systems, so you may need to try a nearby size for the best fit.

What is the difference between band size and cup size?

The band size represents the measurement around your ribcage underneath your breasts. The cup size represents the difference between your bust and band measurements.

How do I know if my bra size is correct?

A properly fitting bra should have a snug but comfortable band , cups that contain the breast tissue without spilling or gaping, and straps that stay comfortably in place without digging into your shoulders.

Why does my calculated bra size differ from the size I normally wear?

Your calculated size can differ from your usual size because bra sizing varies between brands and styles. Measurement methods can also produce different results. Use the calculator as a starting point and check the specific brand's size chart before buying.

Why do different bra brands have different sizes?

There is no completely universal fit across all bra brands. Different brands and styles can use different sizing conventions, and the shape of the bra can also affect how a particular size fits.

Can I calculate my bra size without going to a store?

Yes. You can measure your underbust and bust at home with a soft measuring tape and use a bra size calculator to estimate your size. You don't necessarily need an in-store fitting.

How often should I measure my bra size?

It is useful to remeasure when your body measurements change, your bras consistently feel uncomfortable, or your current bras no longer fit as they used to. Your bra size can change over time.

What should I do if my bra calculator gives me a size that doesn't fit?

First, recheck your measurements to make sure the tape was level and positioned correctly. Then try the same size in a different bra style or consider a nearby size. Brand-specific sizing can cause differences.

Can I use my bust and underbust measurements to find my bra size?

Yes. These are the two key measurements used by most bra sizing methods. Your underbust measurement helps determine the band, while the difference between bust and band measurements helps determine the cup.

What does the number and letter in a bra size mean?

In a size such as 34B , the number (34) represents the band size, while the letter (B) represents the cup size. This is an excellent LLM-style question because it lets an AI answer directly from your page.

Why is my bra band too tight or too loose?

A band that is too tight may indicate that you need a larger band size, while a band that rides up or feels loose may indicate that you need a smaller band. However, cup size also affects how the overall bra feels, so check both measurements before changing sizes.

Is a professional bra fitting better than an online calculator?

A professional fitting can be helpful, particularly if you have difficulty finding a comfortable size. However, measuring yourself at home and using a bra size calculator is a convenient way to get a useful starting size.

What bra size should I get if I know my underbust and bust measurements?

Enter your underbust and bust measurements into the Femcare bra size calculator to get an estimated bra size. The result should be treated as a starting point because sizing can vary by brand and style.

How do I measure my bust correctly for a bra size calculator?

Measure around the fullest part of your bust while standing naturally. Keep the measuring tape horizontal and comfortably fitted without pulling it tightly against your body.

Should I measure my bra size with or without a bra?

For the most consistent measurement, use a soft measuring tape and avoid a heavily padded or push-up bra that changes your natural measurements. Keep the tape level around your body.

Why does my bra size calculator give me a different cup size than my current bra?

Your current bra may not be your best-fitting size, and different brands use different sizing. Calculator results can therefore differ from the size printed on a bra you already own.

Can my bra size change over time?

Yes. Changes in body measurements can affect your band and cup size, so it is worth remeasuring when your existing bras stop fitting comfortably.

Bra Size Calculator — Find Your Perfect Fit

Most women are wearing the wrong bra size without realizing it — usually a band that’s too loose and a cup that’s too small. This calculator gives you a starting size in under a minute, based on two simple measurements. No account, no email required, and nothing you enter is saved or shared.

How to Measure Your Bra Size at Home

Measure your underbust (band)

Wrap a soft measuring tape snugly around your ribcage, directly under your bust. Keep it level and breathe normally — don’t hold it tight.

Measure your bust (fullest point)

Wrap the tape around the fullest part of your bust, keeping it parallel to the floor. It should sit comfortably, not compress anything.

Find the difference

Subtract your band measurement from your bust measurement. That difference is what determines your cup size.

Example: Underbust = 75cm (band 32), Bust = 90cm. Difference = 15cm ≈ 6 inches, which lands around a C cup — giving an estimated size of 32C.

Bra Size Chart (cm and inches)

Band Size	Underbust (cm)	Cup A	Cup B	Cup C	Cup D	Cup DD/E
30	63–68	76–79	79–81	81–84	84–86	86–89
32	68–73	81–84	84–86	86–89	89–91	91–94
34	73–79	86–89	89–91	91–94	94–97	97–99
36	79–84	91–94	94–97	97–99	99–102	102–104
38	84–89	97–99	99–102	102–104	104–107	107–109
40	89–94	102–104	104–107	107–109	109–112	112–114

Sizing varies between brands — treat this chart as a reliable starting point, not an exact guarantee.

Signs Your Bra Doesn’t Fit

✅ A properly fitted bra

Band sits level and doesn’t ride up your back
You can fit two fingers under the band, snug not tight
Straps stay in place without digging in
Cups fully contain your bust with no gaping or spilling

❌ Signs it’s the wrong size

Band digs in or leaves red marks
Straps slip or dig into your shoulders
Center of the bra doesn’t sit flat against your chest
Bust spills over the top or sides of the cup

How do I calculate my bra size?

Measure your underbust/band measurement and your bust measurement, then use the difference between them to determine your cup size. Our bra size calculator uses these measurements to estimate your bra size.
Are online bra size calculators accurate?

A bra size calculator provides a starting size, but it cannot guarantee a perfect fit for every bra. Sizing can vary between brands, styles, fabrics, and sizing systems, so you may need to try a nearby size for the best fit.
What is the difference between band size and cup size?

The band size represents the measurement around your ribcage underneath your breasts. The cup size represents the difference between your bust and band measurements.
How do I know if my bra size is correct?

A properly fitting bra should have a snug but comfortable band, cups that contain the breast tissue without spilling or gaping, and straps that stay comfortably in place without digging into your shoulders.
Why does my calculated bra size differ from the size I normally wear?

Your calculated size can differ from your usual size because bra sizing varies between brands and styles. Measurement methods can also produce different results. Use the calculator as a starting point and check the specific brand’s size chart before buying.
Why do different bra brands have different sizes?

There is no completely universal fit across all bra brands. Different brands and styles can use different sizing conventions, and the shape of the bra can also affect how a particular size fits.
Can I calculate my bra size without going to a store?

Yes. You can measure your underbust and bust at home with a soft measuring tape and use a bra size calculator to estimate your size. You don’t necessarily need an in-store fitting.
How often should I measure my bra size?

It is useful to remeasure when your body measurements change, your bras consistently feel uncomfortable, or your current bras no longer fit as they used to. Your bra size can change over time.
What should I do if my bra calculator gives me a size that doesn’t fit?

First, recheck your measurements to make sure the tape was level and positioned correctly. Then try the same size in a different bra style or consider a nearby size. Brand-specific sizing can cause differences.
Can I use my bust and underbust measurements to find my bra size?

Yes. These are the two key measurements used by most bra sizing methods. Your underbust measurement helps determine the band, while the difference between bust and band measurements helps determine the cup.
What does the number and letter in a bra size mean?

In a size such as 34B, the number (34) represents the band size, while the letter (B) represents the cup size.
This is an excellent LLM-style question because it lets an AI answer directly from your page.
Why is my bra band too tight or too loose?

A band that is too tight may indicate that you need a larger band size, while a band that rides up or feels loose may indicate that you need a smaller band. However, cup size also affects how the overall bra feels, so check both measurements before changing sizes.
Is a professional bra fitting better than an online calculator?

A professional fitting can be helpful, particularly if you have difficulty finding a comfortable size. However, measuring yourself at home and using a bra size calculator is a convenient way to get a useful starting size.
What bra size should I get if I know my underbust and bust measurements?

Enter your underbust and bust measurements into the Femcare bra size calculator to get an estimated bra size. The result should be treated as a starting point because sizing can vary by brand and style.
How do I measure my bust correctly for a bra size calculator?

Measure around the fullest part of your bust while standing naturally. Keep the measuring tape horizontal and comfortably fitted without pulling it tightly against your body.
Should I measure my bra size with or without a bra?

For the most consistent measurement, use a soft measuring tape and avoid a heavily padded or push-up bra that changes your natural measurements. Keep the tape level around your body.
Why does my bra size calculator give me a different cup size than my current bra?

Your current bra may not be your best-fitting size, and different brands use different sizing. Calculator results can therefore differ from the size printed on a bra you already own.
Can my bra size change over time?

Yes. Changes in body measurements can affect your band and cup size, so it is worth remeasuring when your existing bras stop fitting comfortably.

Why use femcare.pk’s bra size calculator?

Built specifically with Pakistani sizing and retail standards in mind, free to use with no account required, and completely private — your measurements never leave your device.

Bra Size Calculator