What You'll Need
A soft measuring tape (the kind used for sewing), a mirror, and a well-fitting non-padded bra or a fitted top. That's it.
Step 1: Measure Your Band Size
Wrap the measuring tape snugly around your torso, directly under your bust, where your bra band sits. Keep the tape parallel to the floor and breathe normally — don't suck in. Round to the nearest whole number.
- If the number is even, that is your band size
- If the number is odd, add 1 to get your band size
Example: If you measure 33 inches, your band size is 34.
Step 2: Measure Your Bust Size
Wrap the tape around the fullest part of your chest, across your nipples. Keep it loose enough to slide two fingers underneath — this measurement should not be tight. Round to the nearest whole number.
Step 3: Calculate Your Cup Size
Subtract your band size from your bust measurement. The difference determines your cup size:
- 0 inches = AA
- 1 inch = A
- 2 inches = B
- 3 inches = C
- 4 inches = D
- 5 inches = DD/E
- 6 inches = DDD/F
- 7 inches = G
Example: Bust 37 inches minus band 34 inches = 3 inches = C cup. Your size is 34C.
How to Convert to Lumisensy Sizing
Lumisensy bras use a simplified S–4XL sizing system designed to fit a wide range of band and cup combinations. Use this guide:
- S — Band 30–32, Cup A–B
- M — Band 32–34, Cup B–C
- L — Band 34–36, Cup C–D
- XL — Band 36–38, Cup D–DD
- 2XL — Band 38–40, Cup DD–DDD
- 3XL — Band 40–42, Cup DDD–G
- 4XL — Band 42–44, Cup G–H
Not sure? Our Fit Experts are available via live chat to find your perfect Lumisensy size in minutes.
Tips for the Most Accurate Measurement
Measure yourself twice to confirm consistency. Always measure in the morning before physical activity. If you're between sizes, size up for a wireless bra a slightly looser band is always more comfortable than one that digs in. For plus sizes, prioritize wide side wings and full-cup support for the best fit and smoothing effect.
Why Fit Matters Even More With Wireless Bras
With underwire bras, the wire compensates for some fit errors by physically holding the shape. With wireless bras, the fit itself does all the work which is why accurate measurements are essential. A well-fitted wireless bra like the Lumisensy CloudBound™ will lift, smooth, and support all day without any discomfort. A poorly fitted one, even a great one, will shift and lose support by midday.
What to Do After Measuring
Once you have your size, the next step is choosing the right style for your lifestyle. For everyday all-day wear, the Lumisensy CloudBound™ Wireless Jelly Smoothing Bra is the top choice seamless, smoothing, wire-free, and available in sizes S to 4XL. For plus size support, the Lumisensy Plus Size Seamless Lumi Bra offers extra coverage and a wider band for maximum comfort.
All Lumisensy orders ship free, and every bra comes with a 60-day free exchange policy so if the size isn't perfect, we'll make it right.
Frequently Asked Questions (FAQ)
How often should I re-measure for a bra? Measure every 6 to 12 months, or any time your weight changes significantly, after pregnancy, or if your current bras start fitting differently.
Can I measure myself without a measuring tape? You can use a piece of string and then measure it against a ruler, but a soft measuring tape gives the most accurate result.
What if I'm between two Lumisensy sizes? Always size up. A slightly larger band is more comfortable and our adjustable straps compensate for the difference easily.
Does Lumisensy have a size finder tool? Yes — the Lumisensy™ Fit Finder on every product page calculates your recommended size based on your band and cup measurements instantly.
Is there a return policy if the size is wrong? Lumisensy offers free exchanges within 60 days. No need to get the size perfect on the first try — we've got you covered.
