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Japanese sizing · cup letter first

F80 Bra Size, In Full

A Japanese F80 is a 80 cm band with a F cup: written cup-first, measured in 2.5 cm steps, and one letter ahead of the Western alphabet. In US terms this body wears a 36DD.

The numbers

F80 measurements

Underbust≈ 80 cm (77.5–82.5)
Top bust≈ 102.5 cm
Difference≈ 22.5 cm → JP F
NotationCup first: F80, not 80F
The trap

A Japanese F is not a Western F

Japanese cup labels start earlier and step in 2.5 cm increments, so each letter sits roughly one label ahead of its Western namesake: this F80 corresponds to a US 36DD and EU 80E. Order your Japanese letter from a Western shop (or vice versa) and you’re a full cup off before the parcel ships. The converter translates in both directions.

US36DD
UK36DD
EU / DE80E
FR / ES95E
IT4E
AU / NZ14DD

Bands translate cleanly (same centimeters as EU labels); only the letters shift.

Same volume, different band

F80 sister sizes

Snugger band, same volumeG75
Looser band, same volumeE85

Japanese sisters move in 5 cm band steps with one cup letter, same volume, different circumference. Useful when domestic stock stops one band short of yours.

Construction

What works at this size

This volume rewards structure, which mainstream Japanese ranges provide less of: domestic stock thins out fast above an E70/E75 frame. Seamed cups and firm bands do the work; many shoppers at this size mix domestic and international brands via conversion.

Neighbors

Related Japanese sizes

Same band (80), other cups

A80B80C80D80E80G80H80

Same cup (F), other bands

F65F70F75F85F90
Answered

F80: answered

What is Japanese F80 in US sizing?

US 36DD (UK 36DD). Japanese cup letters sit one label ahead of Western ones for the same body (a Japanese F corresponds to a Western E-tier cup) so carrying the letter across unconverted buys a cup too big.

What measurements is F80 for?

An underbust around 80 cm (roughly 77.5–82.5 cm) and a top bust near 102.5 cm: a difference of about 22.5 cm, which Japanese sizing labels F. Japan measures in 2.5 cm cup steps against Europe's 2 cm, so conversions are nearest-label, not exact.

Why is the cup letter written first in F80?

Japanese convention writes cup-then-band. C70, not 70C. Same information, reversed order; on tags in Japan you may also see the band alone (70) with the cup on a separate line.

Shop itAt HauteFlair, our sister retailer
36DDD bras →Sister 34GSister 38DD

HauteFlair labels cups in UK letters, so these links already convert your size by position (a US DDD lands on a UK E, a US G on a UK F). HauteFlair is owned by the same company as Brasize.ai; that relationship never changes the sizing math, charts, or fit advice on this page. How this site makes money.

Start from the measured size

Two measurements, no inches added, sister sizes attached.

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