Australia GST Calculator (Add or Remove 10% GST & BAS)
Add 10% GST or calculate the 1/11th GST component backwards from inclusive totals.
UK Bra Size Calculator
Accurate British bra sizing with double-letter cups (DD, FF, GG, HH) for Panache, Freya & M&S.
⟨/⟩ Embed this tool on your site
Paste this into any page — the live tool appears with a credit link back here.
✏️ Sketching your tool…
Sponsored: Recommended offer →
About UK Bra Size Calculator
Accurate British bra size calculator featuring the full UK double-letter cup progression (AA, A, B, C, D, DD, E, F, FF, G, GG, H, HH, J, JJ, K, L). Includes sister size charts and fit guidance for Panache, Freya, Bravissimo, Curvy Kate, and Marks & Spencer.
Why is UK bra sizing considered the global gold standard for D+ cups?
British lingerie brands (Panache, Freya, Bravissimo, Curvy Kate, Elomi) are world-renowned for full-bust engineering. Unlike the US which uses confusing inconsistent labels (like DDD, DDDD, 4D, 5D), the UK system utilizes a standardized double-letter progression where every single step represents exactly one inch of cup volume.
What is the UK cup letter progression?
The UK progression is: A (1″), B (2″), C (3″), D (4″), DD (5″), E (6″), F (7″), FF (8″), G (9″), GG (10″), H (11″), HH (12″), J (13″), JJ (14″), K (15″). Note that the UK does not use "EE" or "I" to prevent visual confusion with numbers.
How does a UK 32G compare to a US 32G?
A UK 32G is significantly larger than a US 32G! A UK G cup represents a 9-inch difference, which equals a US 32I. A US 32G is only a 7-inch difference, which equals a UK 32F.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Uk Bra Size Calculator on Wikipedia. More: all calculators.
Frequently Asked Questions about UK Bra Size Calculator
What is the sister size for a UK 34FF?
The firmer sister size is 32G (one band down, one cup up). The looser sister size is 36F (one band up, one cup down).
Why does Marks & Spencer (M&S) skip the FF cup?
Some M&S collections transition directly from F to G cup. If your calculated UK size is FF and you shop at M&S, try both their F and G cups to check fit.
How tight should a new UK bra band feel?
A new UK bra band should feel comfortably snug on the loosest hooks. Because 80% to 90% of bust weight is supported by the band, a firm band is essential to prevent shoulder pain and strap grooving.
Related Articles & Guides
Oct 18, 2026
Estimate Your Dog Human-Equivalent Age (Guide)
Three steps, two minutes: exact decimal age, UCSD conversion, breed-size correction. Worked example for a 6.5-year-old Beagle (medium): ln(6.5) ≈ 1.872, times 16 ≈ 30, plus 31 ≈…
Read postOct 17, 2026
Dog Years vs Human Years: What Is the Difference?
Dog years count birthdays; human years map developmental equivalence. A 4-year-old dog has lived 4 dog years and functions like a ~53-year-old human. Same animal, two numbers, two…
Read postOct 17, 2026
Which Dog Age Calculator Is Scientifically Accurate?
The scientifically accurate calculator is the one running 16 × ln(age) + 31 with breed-size correction — currently that description fits a short list headlined by our own…
Read post