Skip to content
Bra Size
Size
Bra Size
Find My Size
Brand sizing guide

ThirdLove Size Guide

How ThirdLove labels its cups (including half cups), its published range, its measuring method, and why its E and F are not UK E and F.

Official size guide (opens in a new tab) Check My Fit

Scope: Bras on ThirdLove’s US website. Some ThirdLove pages contradict each other, as noted below. Brand pages checked:

A

Which size labels does ThirdLove use?

US website
ThirdLove’s size chart shows cups after D as E (DD), F (DDD) and G (DDDD), then H and I, and includes half cup sizes. Source (opens in a new tab)

Rule of thumb: use the sizing system shown on the product page you are buying from, and check it against ThirdLove’s guide for that storefront.

B

Published size range

Stated range
Bands 32 to 44 and cups AA to H
Size chart
The size chart shows bands from 30 to 48 and cups up to I

ThirdLove’s stated range and its size chart do not match. Check the size options on the product you want.

C

What ThirdLove says about fit

  • Measuring: ThirdLove’s guide uses a table to turn your underbust into a band size and a second table to find the cup, rather than a single formula, and supports half cups.
Section D · Converting

Converting a size for ThirdLove?

ThirdLove’s E and F are other names for US DD and DDD, not UK E and F. If you are converting a ThirdLove size, use the DD-style letter in brackets (for example F (DDD) is US DDD, which is UK E). We did not find an official ThirdLove UK or EU chart.

Convert a size
Section E · Corrections

Spotted something out of date?

Brands update their sizing pages. Tell us and we will re-check this guide against ThirdLove’s official pages.

Report a correction

Official ThirdLove links

Frequently asked questions

Does ThirdLove use UK or US sizing?

US website: ThirdLove’s size chart shows cups after D as E (DD), F (DDD) and G (DDDD), then H and I, and includes half cup sizes.

What size range does ThirdLove make?

Stated range: Bands 32 to 44 and cups AA to H. Size chart: The size chart shows bands from 30 to 48 and cups up to I. ThirdLove’s stated range and its size chart do not match. Check the size options on the product you want.

Does ThirdLove run small or large?

We do not publish “runs small” or “runs large” claims unless the brand itself says so, and we have not tested ThirdLove bras. Start with your usual size in the sizing system the product uses, then use the fit checker to decide what to change.

How do I convert my size for ThirdLove?

ThirdLove’s E and F are other names for US DD and DDD, not UK E and F. If you are converting a ThirdLove size, use the DD-style letter in brackets (for example F (DDD) is US DDD, which is UK E). We did not find an official ThirdLove UK or EU chart. You can also use our bra size converter.

Sources and review status

Sources last checked: . This guide summarizes ThirdLove’s own published information. It is not a product review, and Bra Size has no relationship with ThirdLove.

Spotted something that looks wrong? Report a correction or read our sizing method.