Measure
start with your underbust and bust measurementsAbout Bra Size Calculator
Measurement-based bra sizing guidance for a starting fit.
Bra Size Calculator helps you turn simple measurements into a practical starting size, then understand how that size should feel in real life. Our goal is to make bra fitting clearer, less intimidating, and more useful before you shop.
Tools and approach
Check
confirm comfort and support when trying a bra5
calculator systems: US, UK, EU, French, and AU/NZMission
Make sizing understandable enough to act on.
Most people are handed a label without enough context: the band rides up, the cups gape, the straps carry too much weight, or one brand feels nothing like another. We built this site to close that gap between a calculated size and a wearable fit.
The calculator gives a starting point. The surrounding guidance explains how to test that result, adjust with sister sizes, compare regional labels, and recognize when shape, style, or support needs matter more than the printed tag.
Method
How our guidance is structured
We combine sizing math with real-world fitting checkpoints because measurements alone cannot describe every body or every bra.
Measure
We translate at-home measurements into a starting size range and explain what the number means before you shop.
Validate
Every result is paired with fit checkpoints so users can tell whether the band, cup, wire, or style needs adjustment.
Refine
Calculator logic, copy, and conversion guidance are maintained alongside measurement instructions, reader feedback, and sizing-system guidance.
Standards
What readers can expect from us
- Measurement-first guidance that starts with underbust and bust data before brand preferences.
- Plain-language fit checks for band tension, cup volume, wire placement, strap load, and movement.
- Regional conversion notes for US, UK, EU, French, AU/NZ, and sister-size shopping decisions.
- Clear limits: our tools are educational starting points, not medical advice or a guaranteed fit.
About the publisher
Bra Size Calculator
We provide sizing estimates and practical fit checks. Measurements cannot establish how every bra will fit, and our guidance does not replace advice from a qualified fitter or clinician.
For corrections or questions about our methods, use the contact link below.
Editorial policy
A transparent process for fit and comfort guidance.
Editorial review
Bra Size Calculator publishes educational sizing tools and fit guidance. These tools do not constitute a professional fitting or clinical review. Contact us to report an error or request a source.
Update cadence
Content corrections should reflect changes to calculator behavior, conversion tables, and cited brand guidance. A page update does not mean it has received a professional or medical review.
Independence
Calculator outputs are not sponsored placements. Affiliate links may support site operations, but they do not determine sizing guidance.
Accessibility
Instructions are written for private, at-home measuring with clear language, predictable steps, and practical next actions.
Public information
Learn more about how we operate.
Review our disclosures, privacy practices, and contact route for feedback, corrections, partnerships, or accessibility concerns.