About UK Bra Calculator

The UK's free, accurate bra size calculator — helping women find their perfect fit since 2024.

Our Mission

Studies show that up to 80% of UK women wear the wrong bra size. ukbracalculator.co.uk was created to solve this problem — offering a free, accurate, and easy-to-use UK bra calculator that anyone can use at home in under 2 minutes.

Built for the UK Market

Our calculator uses UK standard bra sizing, with band sizes in inches (28–46) and UK cup letters (AA, A, B, C, D, DD, E, F, FF, G, GG, H, HH, J, JJ, K). We also include converters for US, EU, Australian, and French sizing for international shoppers.

Smart Sizing Results

Our bra size calculator uses intelligent logic to provide not just your primary size, but also sister sizes, personalised fitting tips based on your measurements, and guidance for sports bras and maternity bras.

What We Offer

UK Bra Calculator

International Size Converter

Measurement Guide with Images

Sister Size Calculator

Maternity Bra Size Calculator

Sports Bra Guide

UK Bra Size Guide & Chart

UK Brand Size Comparisons

Privacy First

All measurements are processed in your browser. We never store your personal measurements. See our Privacy Policy for full details.

Get in Touch

Have feedback, suggestions, or a business enquiry? We'd love to hear from you.