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ブラサイズを計算する
アンダーバストとバストの採寸から、米国・英国サイズの目安となるブラサイズを調べます。
ツール操作エリア
アカウント不要The calculation runs locally using browser APIs; it does not require uploading measurements. Optional analytics and advertising have separate consent and privacy disclosures. Avoid sensitive inputs.
- Approximate UK starting size
- 32D
- Approximate US starting size
- 32D
- Rounded band (inches)
- 32
Approximate adult fitting starting point, not a body assessment. Rounds snug underbust to the nearest even-inch band without adding four inches; cup letters use rounded bust-minus-band difference. US/UK brand charts vary substantially. Fit and comfort take priority; no image or measurement is uploaded.