When it comes to comfort, confidence, and support, finding the right bra size is everything. Yet, so many of us are still wearing bras that don’t actually fit — slipping straps, gaping cups, or uncomfortable bands are all telltale signs of the wrong size. That’s where a detailed bra size chart comes in.
ThirdLove has revolutionized the bra shopping experience with a wide range of sizes and styles, including their signature half-cup options and ultra-comfy wireless bra collections. If you’re ready to ditch the guesswork and finally find a fit that works for you, this guide will show you how to measure correctly and use the size chart with confidence.
How to Take Your Measurements
Before you dive into the size chart, you’ll need two key measurements: your band size and your bust size. All you need is a soft measuring tape and a mirror (or a helpful friend).
1. Band Measurement:
Wrap the measuring tape snugly around your ribcage, directly under your bust. Make sure the tape is parallel to the floor and not twisted. Round to the nearest whole number — this is your band size.
2. Bust Measurement:
Now wrap the tape around the fullest part of your bust, typically across the nipples. Again, keep it level and not too tight. Round to the nearest whole number.
3. Calculate Cup Size:
Subtract your band size from your bust measurement. Each inch of difference corresponds to a cup size — for example, 1″ = A cup, 2″ = B cup, 3″ = C cup, and so on.
Taking measurements when you’re wearing a non-padded bra or a fitted top can help you get more accurate results. And remember, your bra size may vary slightly depending on the brand or style, so don’t be afraid to try a few options.
How to Use the Size Chart
Now that you’ve got your numbers, it’s time to consult the bra size chart to find your perfect match. ThirdLove’s chart goes beyond traditional sizing by including half-cup sizes and a wide range of band and cup combinations, ensuring a more personalized fit.
Here’s how to get the most from it:
- Match Your Numbers: Find your band size in the left column and your cup size across the top.
- Use the Fit Tips: ThirdLove also includes guidance on how a well-fitting bra should feel — snug (but not tight) band, cups that lie flat, and no digging straps.
- Try a Fit Quiz: If you’re still unsure, ThirdLove’s Fit Finder® quiz can recommend a starting size based on your current fit, breast shape, and preferences.
With the right fit, everything changes — posture, confidence, and all-day comfort. Whether you’re shopping for a supportive everyday bra, a seamless wireless bra, or simply want to finally understand your size, ThirdLove’s bra size chart makes it easy to take the guesswork out of finding your perfect fit.