Bra size calculator to estimate an approximate bra size from underbust and bust measurements. Enter measurements in cm or inches and compare estimated sizes across US, UK, EU, FR, and IT systems.
Use this bra size calculator to estimate a starting bra size from two measurements: underbust and bust. It is useful when you want a quick reference before ordering online or when you need to compare common sizing systems without working through a chart manually.
The result is approximate. Bra fit can vary noticeably by brand, style, padding, fabric stretch, and personal comfort preference, so use the estimate as a starting point rather than a guarantee.
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Bra size calculator FAQ
How does the bra size calculator work?
The calculator uses your underbust and bust measurements to estimate a band and cup size. It then shows comparable sizes in US, UK, EU, FR, and IT systems.
How should I measure my underbust?
Wrap the tape horizontally around your body directly under the bust. It should feel snug without digging into the skin or changing your natural posture.
How should I measure my bust?
Measure around the fullest part of the bust while keeping the tape level and parallel to the floor. Avoid thick clothing and do not pull the tape too tightly.
Is the calculated bra size accurate?
It is a starting estimate, not a guarantee. Bra sizing and fit vary by brand, style, fabric, strap adjustment, and personal comfort preference.
Why are US, UK, EU, FR, and IT bra sizes different?
Countries and brands use different systems for band and cup labels. The same body measurements can therefore have different size names in each system.
