Find Your Real Bra Size in 30 Seconds
Free 2-step and 6-step calculators across 7 global systems, sister-size charts, and practical fitting guides by bra fit educator Claire Bennett.
Interactive Bra Size Calculator (7 Systems)
Wrap tape level & snug directly along your ribcage crease on a normal exhale.
Measure across the fullest point of your bust (unpadded bra or bare) without indenting tissue.
Vetted Bras Available in Size 32D on Amazon
Selected by Claire Bennett for true cup depth, wing stability, and comfortable straps.
Editor's Choice$48 – $72Natori Women's Feathers Contour Plunge Bra
Shallow, Petite & Close-to-Wide Set
Top Pick for Large Bust$44 – $68Wacoal Women's Retro Chic Full-Figure Underwire Bra
Full Bust Lift & Forward Projection (C–H)
Most Comfortable$22 – $44Bali Women's Comfort Revolution EasyLite Wirefree Bra
All-Day Wire-Free Comfort & Sensitive Ribs
Claire Bennett • Bra Fit Educator
10+ years boutique fitting • Independent sizing guides
Why Store Bra Charts Keep Getting Your Size Wrong
Most brand size charts try to squeeze you into whatever narrow size range they keep in stock. Our calculators use your real ribcage measurement and actual cup-volume steps across 449 guides.
No “+4 Inches” Padding
We don't add 4 extra inches to your ribcage. A snug band carries the weight so your neck and shoulders don't have to.
10+ Years of Fitting Room Notes
Written by bra fit educator Claire Bennett using real boutique fitting checks and published brand size charts.
Private Browser-Only Math
No accounts, no email popups, and no saved body measurements. Everything runs right in your browser.
Built for Real Body Changes
Separate tools for AA to N cups, 28 to 50 bands, pregnancy, nursing, workouts, weight shifts, and everyday comfort.
How to Measure Your Bra Size Without Tape Mistakes
Stand in front of a side mirror wearing an unpadded bra (or nothing) with a soft fabric tape. Keeping the tape level with the floor helps you avoid a 1 to 2 cup mistake.
Step 1 • Underbust BandMeasure Snug Right Under Your Bust
Wrap the tape right under your bust where the band sits. Breathe out normally and pull it snug so it stays level across your back.
Step 2 • Fullest BustMeasure Level Across the Fullest Part
Hold the tape gently across the fullest part of your bust. Keep it light enough that it doesn't press your breast tissue flat.
Calculators & Fit Quizzes for Every Situation
Smart Fit Diagnostic
Fix riding bands, spilling cups, or top gaps based on how your current bra fits.
Sister Size Calculator
Check matching cup volumes when you move up or down a band size.
Breast Shape Identifier
Match shallow, projected, full-on-bottom, close-set, or wide-set shapes to the right bra cuts.
Brand Size Decoder
See how your size runs in Victoria's Secret, SKIMS, Wacoal, Calvin Klein, Aerie, and UK brands.
Sports Bra Calculator
Compare encapsulation and compression sizing for yoga, gym workouts, or running.
Plus-Size & Full-Bust Tool
Convert US to UK full-bust sizes so you can avoid digging straps and poking wires.
Maternity & Nursing Tool
Adjust for late-pregnancy ribcage changes and early nursing cup growth.
Panty & Shapewear Calculator
Find your fit from waist and hip measurements across bikinis, briefs, and shapewear.
Calculators by Country
Calculate your local tag size for the UK, EU, Australia, France, Japan, India, and more.
Well-Made Bras Worth Trying on Amazon (2026)
Chosen for reliable band stretch, honest US and UK cup sizing, and comfortable wire shapes across shallow and projected busts.
Editor's ChoiceUnderwireNatori Women's Feathers Contour Plunge Bra
A light everyday plunge bra with soft mesh-lace edges that lie flat against your chest. It won't gap at the top when you lean forward.
- Lace edge lies flat on shallow, athletic, or teardrop shapes
- Low center gore stays hidden under V-neck tops
- Soft stretch-lace band smooths the back without rolling
- Too shallow for very projected G+ cup shapes
- Needs a wash bag or hand washing to protect the lace
Top Pick for Large BustUnderwireWacoal Women's Retro Chic Full-Figure Underwire Bra
Built for fuller busts that need real forward lift. Two-part seamed cups with inner side panels bring breast tissue forward and away from your arms.
- Strong upward lift and a centered shape under shirts
- Centered back straps stay on your shoulders
- Tall center gore rests flat against your chest bone
- Seamed lace gives a classic lifted shape instead of round foam
- High center gore shows under low plunge necklines
Most ComfortableWire-FreeBali Women's Comfort Revolution EasyLite Wirefree Bra
Soft four-way stretch knit gives easy everyday comfort with no metal wires. It works well for home days, travel, monthly swelling, and first bras.
- No wire poking or tight band marks on your ribs
- Light breathable knit stays cool in warm weather
- Wide ribbed bottom band helps stop rolling
- Gives gentle natural shaping instead of firm lift
- Not built for running or high-impact workouts
Best ValueUnderwireCalvin Klein Perfectly Fit Lightly Lined Memory Touch T-Shirt Bra
Thin memory-foam cups soften with body heat to sit smoothly, and flat bonded side wings stay hidden under thin tees.
- Smooth laser-bonded cups leave no ridge lines under T-shirts
- Light memory foam molds gently to your natural shape
- Soft brushed wire casing prevents rubbing at the center
- Cups stop at DDD (F)
- Band feels firm for the first few wears before softening
What Changes When Your Band Fits Right
“[ADD REAL DATA: verified reader quote about switching from a loose +4 band to a snug band]”
“[ADD REAL DATA: verified reader quote about fixing cup gaping or finding a better cup shape]”
“[ADD REAL DATA: verified reader quote about converting US to UK full-bust sizing]”
Claire Bennett spent over 10 years fitting women in specialty lingerie shops before starting Bra-SizeCalculator.com. She isn't a doctor, and she doesn't make up fake credentials. She shows the exact tape math behind every result so you can shop without guesswork.
Our sizing desk checks US, UK, EU, French, Italian, Australian, and Japanese conversion tables against current brand size charts. [ADD REAL DATA: optional secondary reviewer name and background]