Size Conversions

This page brings every sizing system together in one space. Whether you’re checking your bikini pant size, cup size or back band, each chart shows how your UK size translates internationally so you can shop with clarity. Follow the rows to find your closest match, use sister sizing to fine‑tune your fit, and take a firm underbust measurement to confirm your back size. It’s everything you need to feel supported, secure and perfectly fitted in your Atolla pieces - wherever you are in the world.

Bikini Back Size

Finding your back size. Measure firmly around your under bust, this gives your back band size. Then follow along the chart to see how it translates internationally. It’s the easiest way to match your perfect fit across regions. All Atolla Bikinis and Swimsuits are shown in UK Back Sizes.

Cup Size

Use the chart to find your international equivalent cup size. Just look along the row for your usual size to see how it translates across. Dual sizes work the same way. All Atolla Bikinis and Swimsuits are shown in UK Cup Sizing.

Pant Size

Use the chart to find your equivalent international size. Just look along the row for your usual size to see how it translates across. All sizes on Atolla are shown in UK sizing. It’s an easy way to match your perfect bikini pant fit wherever you shop.

Sister Sizing

Sister sizing helps you find an alternative size to help with your best fit.
Look along the row for your usual size — if you go up a back size, go down a cup size, and vice versa. It’s a simple way to fine‑tune your support without changing the cup volume