About UK Bra Calculator
An independent, free bra sizing tool and educational hub designed specifically for UK shoppers. Launched in 2024 to provide clear, reliable advice.
Why We Created This Resource
Many studies indicate that a vast majority of women wear the wrong bra size, often due to confusing size charts, brand inconsistencies, and scattered information. We created this website to offer a single, free, and straightforward tool that you can use at home in just a couple of minutes, with support for both centimetres and inches.
Our main focus is on UK sizing, as the UK cup progression (AA, A, B, C, D, DD, E, F, FF, G, etc.) is distinct from US and European systems. Most online calculators default to American sizing, which often leads to mistakes for UK buyers.
Meet Our Editorial Lead & Fitting Expert
UK Bra Calculator — Lingerie Fitting & Editorial Team
UK Bra Calculator features over 12 years of professional experience in lingerie fitting, garment technology, and bra size grading across the UK retail sector. Before leading the editorial content at ukbracalculator.co.uk, our team worked as senior fitting specialists and technical consultants, collaborating with independent boutiques and major British high street brands to help thousands of women find their true support size.
Frustrated by the rampant misinformation online — particularly calculators applying American rules to British sizing or promoting the outdated “+4” method — our team established this platform to provide uncompromising, medically informed, and brand-tested sizing guidance.
How Our Sizing Calculations Work
Our sizing calculator uses the modern professional fitting method rather than the outdated '+4' rule that was popular in department stores decades ago.
- →Band Sizing: Calculated directly from your snug ribcage measurement in inches, rounded to the nearest even band size.
- →Cup Sizing: Determined by the difference between your chest and underbust measurements in inches, where each inch of difference corresponds to a UK cup size (1” = A, 2” = B, 3” = C, 4” = D, 5” = DD, etc.).
- →This calculation method matches the fitting guidelines used by specialist boutiques and major UK brands.
Sources & Research We Reference
When we cite statistics or research, we link to primary sources. Key references used across this site include:
- →The University of Portsmouth Breast Health Research Group, which has published extensively on breast biomechanics, the impact of poorly fitted bras during exercise, and breast ligament health.
- →Published sizing guides from Bravissimo, Freya, Panache, Elomi, Marks & Spencer, and Curvy Kate — used to cross-check brand-by-brand fit differences.
- →NHS guidance on breast health, exercise support, and post-surgery considerations.
What We Offer
Your Privacy Matters
Any measurements you input are processed directly on your device. We do not store, send, or share your personal numbers. Read our Privacy Policy for more information.
Contact Our Team
If you have any feedback, corrections, or general questions, please feel free to reach out to us.
Contact Us