1 Underbust (band)
Wrap the tape snugly around your ribcage, right under your bust. Keep it level all the way round and firm, not tight.
Example: 31 InSize Help • 5-minute Guide
How To Measure Your Bra Size At Home
All you need is a soft measuring tape and a mirror. Measure over a non-padded bra (or none), stand straight and breathe out normally. Write down each number in inches — we will turn them into your size.
What You Need
- A soft tape measure (a phone charger cable + ruler works too)
- A non-padded bra, or no bra
- A mirror to keep the tape level
- 5 minutes and a relaxed breath
Take 4 Measurements
2 Bust (cup)
Measure around the fullest part of your bust with the tape level. Keep it loose enough that it doesn't squash you.
Example: 35 In3 Waist
Around the narrowest part of your waist, usually just above the belly button. Used for shapewear and nightwear.
Example: 29 In4 Hips
Stand with feet together and measure around the fullest part of your hips and bottom. Used for panties.
Example: 38 InWork Out Your Bra Size
Band Size
Round your underbust to the nearest whole inch. If it is an odd number, go up one to the next even number. 31 in → band 32.
Cup Size
Subtract your band size from your bust. Each inch of difference is one cup: 35 − 32 = 3 in → C cup.
Underbust
31 In
→ Band
32
Bust
35 In
→ Cup
C
Your Size
32C
| Bust − Band | In cm | Cup |
|---|---|---|
| Less than 1 in | < 2.5 cm | AA |
| 1 in | 2.5 cm | A |
| 2 in | 5 cm | B |
| 3 in | 7.5 cm | C |
| 4 in | 10 cm | D |
| 5 in | 12.5 cm | DD / E |
| 6 in | 15 cm | F |
Panty & Shapewear Sizes
Use your waist and hip numbers. Between sizes? Pick the larger one for comfort.
| Size | Waist (in) | Hips (in) |
|---|---|---|
| S | 26–28 | 35–37 |
| M | 28–30 | 37–39 |
| L | 30–33 | 39–42 |
| XL | 33–36 | 42–45 |
| XXL | 36–39 | 45–48 |
Try It On: Fit Check
- Band Rides Up At The BackGo down a band size (34B → 32C keeps the same cup volume)
- Gaps At The Top Of The CupsGo down a cup, or try a T-shirt or balconette shape
- Spilling Over The CupsGo up a cup size
- Straps Dig Into ShouldersThe band is too loose — go down a band, loosen straps
- Wire Sits On Breast TissueGo up a cup so the wire sits on your ribcage
Keep The Tape Level
Check in the mirror that it doesn't dip at the back.
Re-measure Every 6 Months
Bodies change with weight, pregnancy and age.
Know Your Sister Sizes
34B ≈ 32C ≈ 36A — same cup volume, different band.
Ask Us Privately
Send your numbers on chat.
Got Your Numbers?
Enter them in the fit finder and we'll suggest your size in every style — or see the full size chart.