A bra size has two parts. The number (32, 34, 36, 38, etc.) is your band size — the measurement around your ribcage, directly under your bust. The letter (A, B, C, D, DD, etc.) is your cup size, representing how much your bust projects beyond the band.

So a 36C means approximately a 36‑inch underbust, with cups that represent a 3‑inch difference between bust and band. The cup letter is always relative to the band — a C cup on a 36 band holds more volume than a C cup on a 32 band.

In US and UK sizing, bra bands come in even numbers. Small bands include 28 and 30. Average bands are 32, 34, and 36 — the most commonly stocked range. Larger bands run 38, 40, 42, 44, 46, and beyond.

Your band size is based on your underbust measurement in inches, rounded to the nearest even number. Some brands add inches to the raw measurement while others use it directly, which is why band fit varies between manufacturers.

US progression: AA → A → B → C → D → DD → DDD → G → H → I → J → K and higher.

UK progression: AA → A → B → C → D → DD → E → F → FF → G → GG → H → HH → J → JJ → K.

Each step represents roughly 1 inch of difference between bust and band. After DDD in US sizing, the next size is G (some brands label DDD as F). In UK sizing, DDD is equivalent to E, followed by F, FF, G, GG, and so on.

Measure your underbust (snug) and bust (fullest part, level). The difference in inches maps to cup size:

Many US retailers cite 34DD as the modern "average" bra size. A survey of over 1,000 US women found 36C to be the most commonly self‑reported size, with 38C, 36B, 34B, and 38DD also appearing frequently.

However, "average" is heavily skewed by mis‑sizing. Professional fitters consistently report that many women need smaller bands and larger cups than what they currently wear. Focus on what fits you correctly, not averages.

Double and triple letters are simply extra increments in the cup progression. In US sizing: D → DD → DDD → G → H. In UK sizing: D → DD → E → F → FF → G → GG → H → HH → J → JJ → K.

Each step represents the same ~1-inch increase. They exist because the original A–D range wasn't enough letters to cover the full spectrum of bust sizes.

No — a 36C has a larger cup volume than a 34C. The cup letter is relative to the band. A 34C volume is equivalent to a 32D or a 36B (sister sizes). Meanwhile, a 36C matches a 34D or 38B.

This is why you can't compare cup letters across different band sizes without understanding sister sizing.

"B cup is small, D cup is huge." Cup letters alone mean nothing without the band. A 30D is much smaller overall than a 42D.

"Most women are 34B." Outdated. Modern data shows many women in C–DD cups across 34–38 bands when properly fitted.

"Go up a band, keep the same cup letter." This increases cup volume. The correct move is a sister‑size adjustment — up one band, down one cup (34D → 36C, not 36D).

"Measure over a padded bra." Padded bras add inches. Measure against skin or over a thin, unpadded bra for accuracy.

Studies estimate roughly 70–80% of women wear the wrong size. The most common mistake is a band too large and cup too small, often from outdated "add 4 inches" methods or limited store size ranges.

If your bra rides up, straps dig in, or you get spillage, you may be in the wrong size. Our bra size calculator can help find a better starting point.

Step 1 — Band: Wrap tape snugly around your ribcage, directly under your breasts. Keep it level, exhale naturally, record in inches, round to nearest even number.

Step 2 — Bust: Wrap tape around the fullest part of your bust, keeping it level and not too tight. Lean forward 90° for the most accurate reading, especially for larger busts.

Step 3 — Calculate cup: Subtract underbust from bust. Each inch = one cup step (1" = A, 2" = B, 3" = C, 4" = D, 5" = DD, etc.).

String method: Wrap a non-stretch string around your underbust, mark where it meets, then measure against a ruler.

Existing bra method: If you own a bra where the band fits well (back stays level), use its tag size as your baseline. Then assess if cups need adjusting up or down.

Paper method: Tape printer paper sheets end-to-end (each is 11 inches), wrap around your body, mark, and measure the total length.

UK sizing uses inches like US but differs in cup naming. Modern UK brands (Panache, Freya, Elomi, Curvy Kate) recommend using the raw underbust measurement without adding inches.

UK cup sequence: A, B, C, D, DD, E, F, FF, G, GG, H, HH, J, JJ, K. Note the double letters (FF, GG, HH, JJ) where US sizing uses single letters.

Wrap a soft tape directly underneath your breasts, in the crease where they meet your torso. Keep it level. Pull snug (not painfully tight) and exhale normally.

If you get an odd number (e.g., 33"), try both adjacent even sizes (32 and 34). Round down for firmer support, up for more comfort. Most support comes from the band, so this measurement is crucial.

Cup size = the difference between your bust and underbust measurements. Take bust measurements in three positions: standing, leaning 90°, and lying down. Average those readings.

Subtract underbust: 1" = A, 2" = B, 3" = C, 4" = D, 5" = DD, 6" = DDD/E, 7" = F/G. This is your starting point — fine-tune by trying the size on.

Measure without a bra or in a thin, unpadded bra. Padded or push-up bras inflate your bust measurement by one or more cup sizes. If uncomfortable, a thin bralette is the next-best option.

The leaning-forward method is essential. When standing, gravity settles tissue and underestimates cup size. Lean 90° so breasts hang naturally, then measure fullest point.

Take all three readings (standing, leaning, lying), average the bust measurements. For the band, pull tape firmly — a common mistake is measuring too loosely, leading to a too-large band and too-small cup.

VS offers in-store fittings but has historically used the "add 4 inches" method, which tends to put women in bands too large and cups too small.

VS also carries a limited range (32–40, AA–DDD), so fitters may guide you toward the closest available size rather than your true best fit. For a more accurate starting point, measure yourself at home or use our bra size calculator.

Online calculators use your body measurements to estimate your best bra size. Most ask for underbust (snug and comfortable) and bust measurements. Advanced calculators also factor in breast shape, fullness, and root width.

The result is a starting point — you may still need to try a few sizes and styles to find your perfect fit. Our calculator provides both US and UK sizes with sister-size recommendations.

Band: Sits level and snug. Two fingers under it, no more. Stays put when you lift arms.

Gore: Center piece sits flat against sternum. If it floats, cups may be too small.

Cups: Smooth, no wrinkling (too big) or spillage (too small). All tissue contained after scoop-and-swoop.

Underwire: Follows your breast crease, sitting on ribcage — never on breast tissue. Extends just past the sides.

Straps: Gentle guidance without digging. One finger underneath comfortably.

Step 1 — Swoop: Lean forward so breasts fall into cups. Fasten hooks.

Step 2 — Scoop: Reach into each cup, gently scoop all tissue — including any migrated toward underarms — forward into the cup.

Step 3 — Adjust: Stand up, check wire placement, gore flatness, and tissue containment.

Many women discover they need a larger cup after properly swooping and scooping, because tissue that sat outside is now positioned inside.

Signs: bra rides up in back, straps dig into shoulders (band not supporting), you can pull the back band several inches away, clasp slides to the side.

Fix: Go down one band size and up one cup letter (sister size). If 36C rides up, try 34D. Fasten new bras on the loosest hook so you have room to tighten as elastic stretches.

Signs: pain or deep red marks around ribcage, back clasp strained on loosest hook, wires distort or dig harshly, difficulty breathing.

Fix: Go up one band, down one cup. But sometimes what feels like a tight band is actually a too-small cup — breast tissue pushes the band forward. Check cup fit first.

Signs: tissue spills over top ("quad-boob") or sides, underwire on breast tissue instead of ribcage, center gore lifts away, constant readjusting.

Fix: Go up one or more cup sizes, same band. If 34C spills, try 34D or 34DD. Re-do scoop-and-swoop before judging.

Signs: wrinkling or gaping at top, fingers slide under cup edge easily, cups stand away when leaning forward, lumpy under clothing.

Fix: Go down one cup. But top-gaping can be a shape mismatch — bottom-full breasts may gap in full-coverage cups. Try a balconette or plunge style instead.

The gore (bridge between cups) should sit flat against your sternum. If it floats, cups are likely too small. Try going up 1–2 cup sizes.

If the gore sits flat but digs in painfully, you may have close-set breasts. Try a plunge style or narrow-gore bra. Some breast roots are so close that a standard gore will never be comfortable.

Sloped/narrow shoulders: Try closer-set strap placement or a racerback converter clip.

Band too large: When the band rides up in back, it pulls straps outward. Go down a band size.

Straps need adjustment: Tighten until snug but not digging — one finger under the strap.

Worn elastic: If tightening doesn't help after 12+ months, the bra is ready for replacement.

Almost always the band is too large. The band should sit level — when too loose, breast weight pulls the front down and seesaws the back up.

Go down one band (up one cup). Fasten on the loosest hook when new. If the loosest hook feels snug, you're in the right band.

T-shirt bra: Smooth molded cups, no seams. Ideal under fitted clothing.

Plunge: Low center gore. Great for low-cut tops and close-set breasts.

Balconette: Wide-set straps, horizontal cup line. Flatters full-on-bottom shapes.

Full coverage: Higher cups, maximum containment. Best for larger busts.

Demi / half cup: Shorter cups, covers about half the breast. Good for shallow shapes.

Strapless: No straps, firm band. Look for silicone grip strips and snug fit. A backless strapless bra uses adhesive instead of a band.

Bralette: Wire-free, unstructured, often S/M/L. Comfortable for lounging or light-support days.

Snug but not painful. Two-finger test: slide two fingers under the band at back, but no more. The band provides ~80% of support.

Always fasten new bras on the loosest hook. If the loosest hook is comfortable and supportive, you're in the right size. Tighter hooks are for later as elastic relaxes. If you need the tightest hook right away, the band is already too big.

This usually means the cups are too small or too shallow for your breast shape. When you lean forward, gravity shifts tissue and a cup that barely contained it while standing will lose containment.

Try going up a cup size and look for a bra with more projection (depth). Seamed, unlined cups tend to be more projected than molded T-shirt bras. A full-coverage style with taller cups can also help keep everything in place during movement.

Sister sizes have different band numbers but the same cup volume. Up one band = down one cup letter (and vice versa).

Useful when cups feel right but the band needs adjusting, or your exact size is unavailable.

Sister up (looser band): add 2 to band, drop one cup. Sister down (tighter band): subtract 2 from band, go up one cup.

Example: 34DD → sister up = 36D, sister down = 32DDD/E. Works best within 1–2 steps; going further alters proportions too much.

Sister up: 34DD (same cups, 2-inch longer band). Sister down: 30G (US) / 30F (UK) (same cups, tighter band).

36G (US): Up = 38DDD/F, Down = 34H

36DDD: Up = 38DD, Down = 34G (US)

30DD: Up = 32D, Down = 28DDD/E

36B vs 36C: One cup difference. 36B has the same volume as 34C and 38A. 36C equals 34D and 38B. The letters represent 1 inch more bust-band difference, not a fixed amount of volume.

Both use US sizing, so a 36C is nominally the same. But actual fit differs due to materials and cup shapes. Savage X offers a wider range (30–46, A–H) vs VS (32–40, AA–DDD). Savage X bands run true or slightly snug; some VS styles run loose. Check each style's size chart and reviews, and try your sister size if between sizes.

Bands: US/UK use inches (30, 32, 34...). EU uses centimeters (65, 70, 75, 80, 85...).

Cups: US/UK share A–D. After D: US goes DD → DDD → G → H. UK goes DD → E → F → FF → G → GG → H.

US DDD = UK E. Quick reference: US DD = UK DD. US DDD = UK E. US G = UK F. US H = UK FF. After that, systems continue diverging — always check the brand's chart above a D cup.

Band tension: Some brands run tight, others stretchy. Cup shape: Narrow vs wide wires, shallow vs deep cups. Materials: Stretch lace accommodates more than rigid molded cups.

You may wear 34D in one brand and 32DD or 36C in another — that's normal. Your measurements are the starting point; the specific brand and style require fine-tuning.

EU 85 ≈ US/UK 38. EU sizing measures underbust in centimeters:

Snugger than everyday bras. One finger (not two) under the band. Cups fully encapsulate each breast. Jump test: minimal bounce. Straps stay in place without digging. New sports bras may feel tight at first — compression fabric relaxes slightly.

Compression: Presses both breasts against chest. Pull-over, S/M/L sizing. Best for A–C cups, low-moderate activity.

Encapsulation: Individual cups support each breast separately. Band/cup sizing (e.g., 34DD). Better shape, less uni-boob. Recommended for D+ cups.

Combination: Individual cups + outer compression. Maximum bounce reduction. Brands like Panache Sport and SheFit use this for high-impact activities.

For running, HIIT, CrossFit, or rowing: choose encapsulation with underwire and band/cup sizing. Key features: firm wide band, individual cups, wide padded straps or racerback, moisture-wicking fabric.

Top options: Panache Sport (up to J cup, encapsulation + compression), Panache Ultra (underwired high-impact), Freya Active (wire-free, up to GG). Always do the jump test in the fitting room.

For yoga, Pilates, walking, or cycling: a wire-free compression bra or supportive bralette with a wider band. A–C cups do well with S/M/L compression. D+ cups still benefit from a wire-free encapsulation bra for gentle shaping. Look for soft fabrics, minimal seams, and racerback/cross-back designs for stretching freedom.

Skip S/M/L compression-only styles. Choose band/cup sizing with encapsulation. Look for underwire or molded cups, wide bands, adjustable straps, and hook closures.

Top brands: Panache (to J), Freya Active (to GG), Elomi Energise (to K in UK), SheFit (adjustable compression, zip front).

Start with the same band/cup size. Sports bras have firmer bands, so some women go up one band (sister size) for comfort during long workouts. For S/M/L sports bras, use the brand's size chart — don't guess from T-shirt size.

Most women need one around the end of the first trimester. Expect band to increase 1–2 sizes (ribcage expansion) and cups 1–3 sizes.

Buy about one band up and one cup up from pre-pregnancy. Look for multiple hook extensions and stretchy cups. Use extenders as needed throughout pregnancy.

Key features: drop-down or pull-aside cups, wire-free (underwire can compress milk ducts), stretchy breathable fabric, supportive but not restrictive.

When to buy: Around 36 weeks pregnant or first weeks postpartum, once milk supply starts regulating.

How to size: Add about one cup for letdown fullness. Choose a band fitting on the tightest hook (ribcage shrinks after delivery). For D+ cups, try band/cup sized options from Bravado, Cake Maternity, or Panache for more precision than S/M/L.

Pumping bras hold breast pump flanges in place for hands-free pumping. They have openings or slits for the flanges. Size like a nursing bra. Some are worn over a regular bra; others function standalone. The most versatile: combination nursing/pumping bras with drop-down cups and flange-compatible openings.

Uses your actual bra size (e.g., 34DD) instead of S/M/L. Tops have underwire, adjustable bands, and shaped cups. Especially beneficial for D+ cups where standard bikinis can't provide enough support.

Brands: Panache Swim, Freya Swim, Elomi Swim, Curvy Kate Swim — all up to K cups. Order your same best-fitting bra size.

Panache Swim — up to J (UK). Bikini tops, tankinis, one-pieces. Freya Swim — up to GG (UK). Trendy with good support. Elomi Swim — up to K (UK). Excellent for plus-size/full-bust. Curvy Kate Swim — up to K (UK). Fun prints. Pour Moi — wide range, budget-friendly.

Order in UK size for these brands. US DDD = UK E. US G = UK F.

Bra-sized swim tops use your exact size. Standard S/M/L swimsuits are based on body measurements with less bust support. For one-pieces, size by your largest area — or buy bra-sized one-pieces/separates to mix sizes. Sister sizes work in swim too.

Projection: How far breasts extend from chest. Projected = need deeper cups (seamed, unlined). Shallow = spread wider, suit molded/demi cups.

Root width: Wide roots suit wider wires. Narrow roots need narrower wires.

Fullness: Full-on-top suits full-coverage/balconette. Full-on-bottom suits plunge and stretch-lace tops.

Spacing: Close-set (nearly touching) = plunge/narrow-gore. Wide-set = side-support panels and wider gores.

Shallow breasts have a wide base with less projection. Deep cups will gap. Best: demi/half cups, molded T-shirt bras, balconettes with wide-set straps, bralettes. Avoid deep, narrow cup shapes.

If breasts are less than one finger-width apart, standard wide gores will dig in. Try plunge bras with narrow gores or narrow-gore styles from Freya, Cleo, and Panache. Wire-free bralettes can also be comfortable.

Side-support bras with inner slings push tissue forward and center. Full-coverage with high sides. Wider underwires. Brands: Elomi, Panache, Wacoal. Avoid narrow plunge styles.

Use leaning measurement for accurate cup size. Choose seamed, unlined cups that accommodate projection. Three-piece cup construction gives the best lift and shape. Full-coverage and balconette styles work better than plunge. A firm band is crucial.

UK brand specializing in plus-size and full-bust bras (bands 34–48, cups E–K UK). Known for comfort, wide range, and fashion-meets-function. Uses UK sizing. Popular styles: Matilda (everyday), Morgan (side support), Energise (sports, up to K).

UK brand for D–K cups with fun, colorful designs. Bands 28–44. UK sizing. Suits projected, full-on-bottom shapes well. Great if you want something more exciting than basics in larger cups.

UK brand, bands 28–40, cups B–K. Sub-brands: Cleo (fashion) and Sculptresse (plus-size). Bands run firm — size up if between sizes. Cups suit moderate to high projection. The Panache Sport is one of the most popular full-bust sports bras. Always order in UK size.

UK brand, bands 28–38, cups B–GG. Youthful colorful designs and deep projected cups great for narrow roots. Bands run slightly stretchy — size down if between. Freya Fancies/Expression plunge styles have narrow gores for close-set breasts.

US brand known for smooth T-shirt bras. Bands 30–38, cups A–DDD/G. Natori Feathers plunge runs shallow and wide — if narrow/projected, size up a cup. Bands are true to size. US sizing throughout.

All US sizing. VS: bands can run loose, range 32–40 AA–DDD. Gap Body: true to size, 32–38 A–DD. Aerie: bralettes XS–XL (check chart), wired 30–40 A–DDD.

If you fall outside these ranges (below 30 or above DDD), specialty brands like Panache, Elomi, or Freya will serve you much better.

Plus size: larger bands (38–46+), any cup range. Full bust: larger cups (D–K+) on any band, including 28–34.

You can be both (42GG) or one. Elomi and Goddess cover both. Panache and Freya focus on full-bust-on-smaller-bands.

Small bands (28–30): Panache, Freya, Curvy Kate, Bravissimo.

Small bands + large cups (28–32 DD–K): Panache, Freya, Ewa Michalak, Comexim.

Large bands (44–56): Elomi, Goddess, Glamorise, Torrid.

Large bands + small cups (40–48 A–C): These are the hardest to find. Check Goddess, Leading Lady, and online retailers specializing in extended sizes.

Very large cups (GG–K+): Elomi (to K), Panache/Sculptresse (to K), Curvy Kate (to K), Ewa Michalak (custom sizing).

Yes, though options narrow above a G cup. For DD–G: Panache Evie, Freya Deco, Wacoal Red Carpet. For GG–K: Elomi Smooth, Curvy Kate Luxe, and Sculptresse. Key fit tip: size down one band if possible — strapless bras rely entirely on the band for support, so it needs to be very snug. Silicone grip strips along the top edge help prevent slipping.

With proper care and rotation, a well-made bra typically lasts 6–12 months of regular wear. Signs it's time to replace: the band feels loose even on the tightest hook, straps won't stay adjusted, underwires poke through fabric, cups are misshapen or no longer supportive, the elastic feels limp.

Rotating between 3–4 bras extends each one's life. Let each bra "rest" at least one day between wears so the elastic can recover its shape.

Best method: Hand wash in cool water with a gentle detergent or lingerie wash. Swish for a minute, rinse thoroughly, and press (don't wring) excess water out. Reshape cups and air dry flat or hung by the center gore — never by one strap.

Machine washing: If you must, use a mesh lingerie bag on the delicate/cold cycle. Hook all clasps first to prevent snagging. Skip the dryer — heat degrades elastic and warps underwires.

Wash after every 2–3 wears (more often in hot weather). Overwashing breaks down elastic faster, but sweat and body oils also weaken fabric, so find a balance.

If an underwire pokes through its casing, push it back in and apply a small piece of moleskin, medical tape, or a fabric patch over the hole. For a more permanent fix, hand-stitch the opening closed with a sturdy thread.

Repeated wire poking usually means the cups are too small (the wire is under excess stress) or the bra has reached end-of-life. A well-fitting bra shouldn't have wire breakage issues within its first several months.

Tighter hooks: Move to the next hook-and-eye closure. If you're already on the tightest hook, the bra may be due for replacement.

Bra band shortener: Small clip-on accessories that take up slack in the band, available at lingerie stores and online.

DIY alteration: A tailor can shorten the band by removing and resewing the hook panel closer to the cups. This costs a few dollars and extends the bra's life.

To prevent premature stretching: always fasten on the loosest hook for a new bra, hand wash or use a mesh bag, and never put bras in the dryer.