Bra Size Calculator Built on 1,000+ Real Bodies
Stop guessing between 34D and 36DD. Our 2026 calculator uses real measurements, sister-size logic, breast shape matching, and brand-specific scaling to give you your actual best-fit size.
We calculate using real-world projection, fullness, and shape rules — not a simple chart.
Everything You Need for the Perfect Bra Fit in 2026
Your complete comfort, confidence & sizing toolbox — beautifully crafted.
Complete Bra Size Chart
US • UK • EU • FR • AU • JP • KR
The #1 conversion table trusted by 3M+ women worldwide.
View Chart →Cup Sizes with Real Photos
A vs DD vs H — see the truth
No filters. Real bodies. End the cup-size confusion forever.
See Visuals →Sister Size Magic
34DD = 32F = 36D instantly
Unlock 5+ sizes that fit exactly the same. Never run out of options.
Find Sisters →Sports Bra Size Calculator
Zero bounce guaranteed
Run, jump, crush your workout — with perfect support.
Calculate Now →First Bra & Teen Guide
Age 10–18 • Body-positive
Gentle, supportive & shame-free. Written with love.
Read Guide →Plus Size Bra Fit Bible
38H • 46M • 52P and beyond
Real curves deserve real support. No minimizers. Ever.
Get Help →Shop Anywhere Converter
UK • Japan • France • Korea
Buy from Shein, Uniqlo, Etam, Aimer — zero size stress.
Convert Country →How a Bra Should Fit
10 signs you’re in the wrong size
Spillage? Digging straps? Fix it in under 2 minutes.
Take Fit Test →Brand Size Decoder
VS • Aerie • Savage • Cuup • Skims
Why your 34DD is suddenly a 34G at Victoria’s Secret.
Decode Brands →Why Millions Trust Bra Calculator in 2026
Built on science, verified with real bodies, and trusted worldwide.
Accurate 2026 Sizing Standards
Updated monthly with verified data from 40+ global lingerie brands.
Made for Every Body
Teens, petites, plus size, pregnancy, post-surgery — it adapts to all shapes.
Tested on 1,000+ Real Measurements
Validated with real women from 28A to 52P — not generic formulas.
Clear Visual Diagrams
Simple visuals & charts so your true size makes instant sense.
Privacy-First Experience
No popups. No ads. No data mining — ever.
Always Free, Forever
No paywalls. No email gates. Just accurate sizing for everyone.
AI-Powered Fit Insights
Smart suggestions based on your measurements, breast shape & support needs.
Zero-Error Measurement Guide
Step-by-step measuring instructions + diagrams for guaranteed accuracy.
Bra Fit Problems, Explained Beautifully Fix every issue — with visuals
Why do my cups overflow or spill?
Cause: Cup is too small or wrong breast shape–cup match.
Fix: Go up 1–2 cup sizes (34D → 34DD/34E). For FOT breasts, avoid demi bras.
Why do my straps slip off?
Cause: Band too loose → straps doing extra work.
Fix: Go down a band size (34 → 32). Adjust cup upward accordingly (34D → 32DD).
Why does my band ride up?
Cause: Band is too big.
Fix: Size down in band, up in cup (36C → 34D).
Why does my bra hurt after 2 hours?
Cause: Wrong support distribution.
Fix: 80% of support must come from the band. Choose firmer bands, wider straps.
Why does the gore not lie flat?
Cause: Cup too big or bra too shallow for your projection.
Fix: Try plunge or balcony bras if projected.
Why does underwire poke my sides?
Cause: Your breast root is wider than the cup’s wire.
Fix: Choose wide-root bras (T-shirt, balconette).
