Bra Size Calculator: Japan

7 sizing systems25+ country calculatorsBands 28-60, cups AA-PZero data stored

Measure once, and this calculator highlights your size in Japan's JP convention while showing all 7 international systems for imported brands. Enter your snug underbust and fullest bust below.

Enter your measurements

Underbust (snug, cm)Bust at fullest point (cm)

This calculation runs entirely in your browser. Your measurements are never stored or sent anywhere.

Shopping for bras in Japan

Japanese sizing prints the cup before the band, C75 rather than 75C, and its cup letters run roughly one letter fuller than EU for the same measurements: many EU B wearers buy a JP C. Bands run 65 to 90 in most ranges, and everything above that gets scarce quickly.

Japanese brands like Wacoal Japan and Peach John cut for shorter torsos and closer-set shapes, with beautifully engineered smaller bands that are hard to find anywhere else.

Brands you will commonly see: Wacoal, Peach John, Triumph Japan, Uniqlo.

Frequently asked questions

What bra sizing system does Japan use?

Japan primarily uses JP sizing conventions in mainstream retail, though imported brands can carry other systems' labels. The calculator above highlights your JP size and shows all 7 systems for imports.

Which bra brands are common in Japan?

Commonly available names include Wacoal, Peach John, Triumph Japan, Uniqlo. Local availability shifts, and each brand's own centimeter chart beats any converted label when they disagree.

Next steps

Last updated August 2026.