Bra Size Calculator
About

About Bra Size Calculator

Expert-reviewed bra sizing guidance for a better 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.

Use the calculatorContact the team

Professional background

12+
years of professional fitting experience
18k+
fittings informing our practical guidance
5
calculator systems: US, UK, EU, French, and AU/NZ

Mission

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 reviewed against fitter experience, reader feedback, and sizing-system changes.

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.

Expert review

Sarah Williams

Certified bra fit specialist with 12+ years of experience across boutique fittings, online sizing support, everyday fit, full-bust support, post-pregnancy fit, and post-surgery comfort considerations.

Last reviewed: March 2026. Next scheduled editorial refresh: June 2026.

Editorial policy

A transparent process for fit and comfort guidance.

Editorial review

Core calculator pages and fit guides are reviewed by Sarah Williams, a certified bra fit specialist with boutique, e-commerce, virtual fitting, and specialty-fit experience.

Update cadence

High-traffic guidance is reviewed at least quarterly and sooner when calculator behavior, conversion tables, brand conventions, or safety-related language changes.

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.