Bra Size Calculator

Grab a soft measuring tape.

Make sure you’re wearing a non-padded bra.

Measure your bra size to the 1/8th inch or 1/2 centimeter for your most accurate result.

Use a mirror to make sure the tape is straight in the back.

Step 1

Select your preferred sizing

Step 2

Measure your underbust

Wrap a soft measuring tape just below your bust, making sure it’s tight and even in the back. Take your measurements to the nearest 1/8th of an inch or .5 cm.Enter your underbust measurement

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Step 3

Measure your bust

Wrap a soft measuring tape around the fullest part of your bust. Make sure it’s tight and even in the back.Enter your bust measurement

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Enter your measurements to see bra size

Bra Size Tips

Remember, bra size is an art, not a science. Bra construction, fabric stretch, the bra’s style line, and your personal comfort preferences are other important factors that can help determine your bra size. We recommend starting with the bra size our tool suggests. If it’s not a perfect fit, try your sister sizes.

Bra size chart

Not a measurements person? Find your size in the chart below. Underbust measurements run across the top, full bust measurements down the side, and the cell where they meet is your Honeylove size.

Full bust

Bra size by underbust and full bust measurement
Full bust	Underbust
	27	28	29	30	31	32	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48	49	50	51
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59

How to read the chart

Measure just below your bust for your underbust, and around the fullest part of your bust for your full bust. Find your underbust measurement in the top row, scan down to your full bust measurement, and read your size where the two meet.

Tap your size in the chart to select it. If you’ve already entered your measurements above, your size is highlighted automatically. If your size falls between two options, the sister size section below explains how to adjust.

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More about bra sizing

What makes the perfect bra fit?

A bra size calculator gives you a number and a letter. That’s a starting point, not a destination. A bra truly fits when the band sits level all the way around your body and the cups contain every bit of breast tissue without squeezing or gaping. If you stop thinking about it within an hour of putting it on, it fits.

Here’s the catch: bra sizes aren’t standardized because they’re the intellectual property of each brand. The size you wear at one retailer may not translate directly to another. Understanding how band and cup work together will help you interpret your calculator result and actually find a bra that feels right on your body.

Bra cup fit vs. bra band fit

Most women focus on cup size first. That instinct makes sense, but it’s backwards. The band is where you should start, because your band provides 80–90% of a bra’s support. Get the band right, and the cups sit where they’re supposed to. Get it wrong, and nothing else works.

Here’s what a well-fitting band looks like

Level all the way aroundIt sits parallel to the floor around your whole body, not hiking up in the back.
Room for one to two fingersYou should be able to slide one to two fingers underneath comfortably. If the bra pulls away from your body easily, it’s too loose. If you can’t get your fingers under the band and it feels uncomfortable, it’s too tight.
No riding up in backIf the band rides up, the straps compensate by pulling upward. That puts excess tension on your shoulders and reduces support. That’s a band problem, not a strap problem.

Honeylove bras use a signature bonded underbust cradle that provides structured support without relying on a tight band alone. So the band size the calculator returns is the size to order.

Now, the cups. A well-fitting cup fully contains breast tissue with no spillage at the top or sides and no wrinkling. The center gore (the small panel between the cups) should lie flat against your sternum. If it floats away, your cups are too small.

Cups that gap or pucker are either too large or the style doesn’t match your breast shape.

Cup and band fit work together. If the band is too loose, even the right cup size won’t sit correctly. Fixing the band first is always the right move.

Sister sizes: Your fit adjustment tool

A sister size is two bra sizes that share the same cup volume but pair that volume with a different band size and cup letter.

Here’s the math. Cup size represents the difference in inches between your bust and underbust measurements. Each inch of difference equals one cup size — 1 inch = A cup, 2 inches = B cup, 3 inches = C cup, and so on.

Because the cup letter is proportional to the band, going up one band size and down one cup letter keeps the volume identical. Going down one band and up one cup letter does the same in the other direction.

Here’s how that looks in practice:

32D → 34C → 36B are all sister sizes. All three hold the same cup volume. The band gets larger as you move right, but what the cup actually holds stays constant. The same cup letter contains different volumes on different band sizes — a 34C has more volume than a 32C because the band is larger.

Two common scenarios where sister sizing solves the problem

“The cups fit, but the band feels too tight”Go up one band size, down one cup letter. The cup volume stays the same; the band gives you more room.
“The band rides up in the back”Go down one band size, up one cup letter. The band gets firmer; the cup volume stays constant.

Because Honeylove bras are true to size, the calculator result is the right starting point. Sister sizing is the adjustment tool when something feels close but not exact — not the first move.

How to find the perfect fitting bra for your breast shape

Two women who wear the exact same bra size can have completely different fit experiences. The reason is breast shape.

Different cup constructions interact differently with different tissue distributions. That’s why a bra can be technically the right size and still feel wrong. The table below matches common breast shapes to the Honeylove styles engineered for each shape’s specific fit challenge.

Shape	Fit challenge	Construction need	Honeylove recommendation
Asymmetric	Cups hold a fixed shape, but breasts differ side to side, causing one cup to gap or overflow	Flexible, stretch cups that conform independently to each side	Silhouette Bra, CrossOver Bra, CrossFlex Bra — four-way stretch cups adapt rather than impose a rigid shape
Tubular	Lower pole is narrow; tissue projects forward rather than filling out the cup base	Contoured/molded lower cup to add roundness; side support to center tissue	CloudEmbrace Bra — molded foam cups add gentle roundness at the lower pole; smoothing wings center tissue
Full on top	Tissue sits higher in the cup; standard cups cut in at the top and cause overflow	Taller cup height with structured upper coverage	CloudEmbrace Bra — higher cup profile and full coverage contain upper fullness without spillage
Full on bottom	Tissue is heavier below the nipple; cups without a secure lower structure allow tissue to push down and out	Full coverage with a reinforced lower cup	CloudEmbrace Bra, CrossOver Bra — bonded underbust cradle and full-coverage cups secure lower tissue
Wide-set / east-west	Nipples point outward; tissue spreads toward the underarms	Lower center gore that draws tissue inward	Silhouette Bra, CrossOver Bra — low gore construction gently centers tissue
Relaxed / longer tissue	Less natural projection; tissue sits lower on the chest wall	Lift engineering in the underbust cradle	CrossOver Bra, CloudEmbrace Bra — bonded underbust cradle lifts tissue from below without relying on underwire
Athletic / less projected	Shallow projection; tissue sits wide and close to the chest wall; too-projected cups create gaps	Flexible or lightly padded cups that shape without imposing projection	CloudEmbrace Bra — lightly padded molded cups create shape for shallow projection
Round	Even fullness above and below the nipple; most styles work well	Most Honeylove styles fit this shape; focus on coverage preference	CrossOver Bra, SoftForm Bra — versatile fits for balanced fullness

Not sure of your shape? Check out our guide →

Common bra fit issues and solutions

Even with accurate measurements, fit can vary by style and construction. Below are the most common signals your bra is sending you and how to fix them.

The band rides up in the back

A band that migrates upward is too loose. When it rides up, the straps compensate by pulling harder. That shifts the support load to your shoulders and away from the band where it belongs. The band is responsible for about 80% of the bra’s support. When it isn’t doing its job, everything else fails.

Try a sister size: go down one band, up one cup letter. The cup volume stays the same, but the band gets firmer.

On a new Honeylove bra, always start on the loosest hook. The middle and tightest hooks are there for later, as the elastic naturally relaxes over time.

The cups pucker or gape

Gaping cups are usually too large. But before you size down, consider this: the issue may be breast shape rather than size. Shallower or wide-set breast shapes often gap in cups built for more projected tissue, even when the size is technically correct.

Try sizing down one cup first. If the gap persists, the style’s cup shape may not match your breast shape. The breast shape section above can help you match your anatomy to the right Honeylove construction.

Breast tissue spills over the top or sides

Spillage means the cups can’t contain the volume they’re being asked to hold. Size up one cup.

If spillage happens specifically at the top, the cup height may be too short rather than the volume being too small. The CloudEmbrace Bra’s taller cup profile is built for women who carry fullness in the upper half of their breast.

The straps dig into the shoulders

Straps that dig into your shoulders are taking on too much weight. The band is likely too loose or the cups aren’t the right size. This is almost always a band issue.

Fix the band fit before adjusting straps. Tightening straps on a loose band makes the problem worse, not better. A properly anchored band takes the weight off your shoulders entirely.

The center gore floats away from the sternum

The center gore should press flat against your sternum at all times. If you can see space when looking down, the band is too loose or the cup is too small. Breast tissue with nowhere to go pushes the gore forward.

Size up one cup. If the gore still floats after a cup adjustment, the style’s gore height may not suit your breast spacing. A lower-gore style like the Silhouette Bra or CrossOver Bra will fit better.

Back bulge at the band

The band size may be correct, but the wing construction isn’t distributing pressure across enough surface area. A narrow band concentrates force and pushes tissue upward or outward at the edges.

The Honeylove SoftForm Bra and Silhouette Bra both feature wide smoothing wings engineered to spread band pressure and eliminate back bulge. The SoftForm’s completely seamless, hardware-free design disappears under clothing while offering fuller-coverage support.

Underwire poking or migrating

Underwire should lie flat on your ribcage, not on breast tissue. If it pokes or digs, your cup is too small or the wire width is wrong for your shape. Size up one cup first.

If discomfort persists after a size adjustment, the issue is likely construction rather than size. Honeylove’s CloudWire technology, available in the CloudEmbrace Bra, uses a flexible wire wrapped in foam that follows the breast root without creating pressure points.

For women who want to skip wire entirely, the CrossOver Bra and SoftForm Bra offer bonded underbust support as a wireless alternative.

When to re-measure your bra size

Bra size isn’t fixed. Your body changes in ways that affect both band and cup measurements. A size that fit perfectly last year may not be the right size today. Your cup size can change up to six times in your lifetime due to weight changes, hormonal shifts, and pregnancy.

Here are five triggers that signal it’s time to use the bra size calculator again

Every 6–12 months as a baselineYour body can change more than you realize in that time. Building a re-measure into a regular routine catches size changes before they become fit problems.
After significant weight changesBoth band and cup measurements shift with body weight, but not always proportionally. For many women, a gain or loss of around 15 to 20 pounds is enough to change their cup size.
During and after pregnancyOn average, breasts increase by 1–2 cup sizes during pregnancy and may grow another 1–2 sizes when milk comes in. The band size typically increases by 2–6 inches as the ribcage expands. Both measurements change again after delivery and during breastfeeding.
After starting or stopping hormonal medicationsBirth control pills can increase breast size because they contain estrogen and progestin, though the effect is usually temporary. Hormone therapy and other medications can also cause breast tissue to fluctuate. This is one of the most commonly overlooked triggers for a size change.
Any time current bras start fitting differentlyIf a bra that used to feel right now rides up, gaps, or digs in — and you know it hasn’t stretched from age — your body has changed. The bra isn’t defective.

Ready to remeasure? Jump back to the calculator ↑

Bra sizing FAQs

Band size is the number in your bra size (like the “34” in 34C). It corresponds to the measurement around your ribcage just below the bust. Cup size is the letter (like “C”), and it represents the difference between your bust measurement at the fullest point and your band measurement.
Band size carries roughly 80 percent of a bra’s support load. When the band is right, the bra stays anchored on your body and everything else functions correctly.
Bra sizes are not standardized. They are intellectual property owned by individual brands. That’s why you can be a 34C in one brand and a 36B in another.
Honeylove bras are built true to measured size. If your calculator result differs from what you’ve been wearing elsewhere, the calculator is likely more accurate than the size you’ve been defaulting to. Trust the measurement and use sister sizing to fine-tune if needed.
Start with the size closest to your calculator result. If the band feels slightly snug, try the next band size up while going down one cup letter (that’s sister sizing, and the cup volume stays the same). If you prefer a firmer feel, go with the smaller band.
The CloudEmbrace Bra’s cup-and-band sizing offers precise fit, while styles like the CrossOver Bra and SoftForm Bra use more forgiving stretch construction that accommodates in-between measurements comfortably.
Check your bra size every 6 to 12 months. Your body changes more frequently than you might realize, and a regular fitting ensures your bras are still providing the right support. Remeasure sooner after weight fluctuations, pregnancy, or starting or stopping hormonal medications.
Yes, because different bra constructions interact with the body differently. The CloudEmbrace Bra uses precise cup-and-band sizing with molded foam cups, so it fits like a traditional t-shirt bra. The CrossOver Bra and SoftForm Bra use bonded underbust support with stretch cups, which offer a more forgiving fit across a range of shapes.
Start with your calculator size for any style, then use the breast shape guide to confirm the construction matches your body.

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