Bra Size Conversion Chart: UK, US and Pakistan Sizes

UK and US bra band sizes (32, 34, 36) are broadly similar, but cup letters diverge at larger sizes, which is why your usual size can feel different between brands. The reliable approach is to measure your band and bust in inches, then check the specific size guide on the product you're buying rather than assuming a letter. Here's how the systems compare, with a full conversion chart.

Part of our complete guide to bras.

How do you find your bra size before converting?

Measure two numbers first: your band (under the bust) and your bust (across the fullest part). Subtract the band from the bust: the difference in inches gives your cup. A 1-inch difference is roughly an A cup, 2 inches a B, 3 inches a C, 4 inches a D, and so on. Our complete guide to how to measure your bra size at home walks you through it in minutes, and works as a simple bra size calculator you can do with just a measuring tape.

Bra size conversion chart: UK, US, EU and inches

Here is a quick bra size conversion chart. Band sizes are shown in inches alongside their UK and EU equivalents, followed by how the cup letters line up.

Band size conversion

Cup size conversion (UK to US)

To change your bra size to centimetres, multiply inches by 2.54 (so a 34-inch band is about 86 cm).

How do band sizes compare across UK, US and Pakistan?

Band sizes are based on your ribcage measurement, and UK and US band numbers (32, 34, 36 and so on) are broadly similar. Pakistani retailers typically use UK or US sizing, so the band is the easier part to match across systems. A Pakistan bra size chart usually follows the UK system.

How do cup sizes differ between UK and US?

Cup sizing is where systems diverge. A, B, C and D cups start out similar, but from DD upwards the larger cup letters differ between UK and US systems, as the chart above shows. This is why checking each product's specific size guide matters more than assuming your usual letter.

What's the most reliable way to get the right size online?

Measure yourself accurately, then check the size guide on the actual product. At Erblis, each product page includes sizing details so you can match to your measurements directly rather than relying on conversions.

Can your bra size change over time?

Yes. Weight changes and even a worn-out band can shift your fit, so re-measure periodically — see how often to replace your bras. The same measure-then-check approach applies to underwear sizing.

Frequently asked questions

Are UK and US bra sizes the same?

Band sizes are broadly similar, but cup letters differ from DD upwards. Always check the specific product's size guide.

How do I convert my bra size to inches or cm?

Measure your underbust in inches and match it to the band chart above. To convert to centimetres, multiply inches by 2.54.

What bra size system does Pakistan use?

Pakistani retailers typically use UK or US sizing. Measuring yourself and checking the product size guide is the most reliable approach.

How do I measure my bra size at home?

Measure your band under the bust and your bust across the fullest part, both in inches, then subtract the band from the bust to find your cup. See our full bra size guide.

Does Erblis deliver bras in Karachi?

Yes. Erblis offers free Karachi delivery, Cash on Delivery, and a free tote bag with every order.

Shop with confidence at Erblis — browse the bras collection. Free Karachi delivery, Cash on Delivery, free tote bag. Use code WELCOME10 for 10% off.