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Bra size calculator

Look up a bra size from underbust and full-bust measurements using Triumph Singapore's size chart.

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Look up a bra size from underbust and full-bust measurements using Triumph Singapore's size chart.

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Precision and calculation record
Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.
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Formula and assumptions
This is a lookup of Triumph Singapore's band and cup chart, not a universal fit rule. Measure around the ribs below the bust and around the fullest part of the bust with a level tape. The chart covers underbust 68-102 cm and bust-minus-underbust differences of 10-24 cm. Measurements in gaps between printed ranges show both neighboring entries; no rounding rule or guaranteed fit is invented. Check the specific garment and its local size guide before buying. Other Triumph regions and brands may use different cup labels.
Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.
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Using Bra size calculator
Look up a bra size from underbust and full-bust measurements using Triumph Singapore's size chart.
This is a lookup of Triumph Singapore's band and cup chart, not a universal fit rule. Measure around the ribs below the bust and around the fullest part of the bust with a level tape. The chart covers underbust 68-102 cm and bust-minus-underbust differences of 10-24 cm. Measurements in gaps between printed ranges show both neighboring entries; no rounding rule or guaranteed fit is invented. Check the specific garment and its local size guide before buying. Other Triumph regions and brands may use different cup labels.
Next: Clothing size converter
Next: Length converter
A worked example
Underbust 75 cm and full bust 88 cm give a difference of 13 cm. Triumph Singapore lists band 34 / EU 75 and cup B for those measurements: 34B / EU 75B.
Before you use the result
This is a lookup of Triumph Singapore's band and cup chart, not a universal fit rule. Measure around the ribs below the bust and around the fullest part of the bust with a level tape. The chart covers underbust 68-102 cm and bust-minus-underbust differences of 10-24 cm. Measurements in gaps between printed ranges show both neighboring entries; no rounding rule or guaranteed fit is invented. Check the specific garment and its local size guide before buying. Other Triumph regions and brands may use different cup labels.
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ToolOctopus. “Bra size calculator.” Updated 2026-10-03. https://tooloctopus.com/bra-size-calculator.
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