Full bust
Measure around the fullest point of your bust, with the tape level across your back.
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NINONERA FIT STUDIO
Find the size that feels like you.
Measure once, understand what the numbers mean, and choose a starting point that supports how you want to feel.
Choose the guide that matches what you are shopping for.
01 · HOW TO MEASURE
A level tape makes all the difference.
Measure on bare skin or over an unpadded, close-fitting layer. Keep the tape parallel to the floor and comfortably snug—never pulled tight.
Underbust
Wrap the tape around your ribcage where the bra band naturally sits.
Natural waist
Measure at the narrowest point without holding your breath or pulling inward.
Full hip
Stand with feet together and measure around the fullest point of your hips and seat.
02 · BRA SIZE CALCULATOR
Two measurements. One considered starting point.
Enter your snug underbust and the difference between full bust and underbust in inches. The result is a starting point—not a replacement for the fit notes on each product.
03 · BAND & CUP CHARTS
Turn measurements into your bra size.
First match underbust to a band. Then match the bust-minus-underbust difference to a cup.
Step 1 Band chart
| Underbust · in | 26–28 | 28–30 | 30–32 | 32–34 | 34–36 | 36–38 | 38–40 | 40–42 | 42–44 |
|---|---|---|---|---|---|---|---|---|---|
| Band size | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 |
Step 2 Cup chart
| Difference · in | 3.5–4.5 | 4.5–5.5 | 5.5–6.5 | 6.5–7.5 | 7.5–8.5 | 8.5–9.5 | 9.5–10.5 | 10.5–11.5 | 11.5–12.5 |
|---|---|---|---|---|---|---|---|---|---|
| Cup | A | B | C | D | DD/E | DDD/F | G | H | I |
View the complete band + cup chart ＋
| Band | A | B | C | D | DD | DDD | G | H | I |
|---|---|---|---|---|---|---|---|---|---|
| 30 | 30A | 30B | 30C | 30D | 30DD | 30DDD | 30G | 30H | 30I |
| 32 | 32A | 32B | 32C | 32D | 32DD | 32DDD | 32G | 32H | 32I |
| 34 | 34A | 34B | 34C | 34D | 34DD | 34DDD | 34G | 34H | 34I |
| 36 | 36A | 36B | 36C | 36D | 36DD | 36DDD | 36G | 36H | 36I |
| 38 | 38A | 38B | 38C | 38D | 38DD | 38DDD | 38G | 38H | 38I |
| 40 | 40A | 40B | 40C | 40D | 40DD | 40DDD | 40G | 40H | 40I |
| 42 | 42A | 42B | 42C | 42D | 42DD | 42DDD | 42G | 42H | 42I |
| 44 | 44A | 44B | 44C | 44D | 44DD | 44DDD | 44G | 44H | 44I |
| 46 | 46A | 46B | 46C | 46D | 46DD | 46DDD | 46G | 46H | 46I |
04 · BRA-TO-ALPHA CONVERSION
When a bra is sized XS–5XL.
Use this matrix as a starting point for alpha-sized bras. Always prioritize the sizes and fit notes offered on the product page.
| Cup / Band | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 |
|---|---|---|---|---|---|---|---|---|---|
| A | XS | XS | S | M | — | — | — | — | — |
| B | XS | S | S | M | L | XL | 2XL | — | — |
| C | S | S | M | L | L | XL | 2XL | 3XL | — |
| D | — | S | M | L | XL | XL | 2XL | 3XL | 4XL |
| DD/E | — | M | L | XL | 2XL | 2XL | 3XL | 3XL | 4XL |
| DDD/F | — | — | — | — | — | 3XL | 3XL | 4XL | 4XL |
| G | — | — | — | — | — | — | 4XL | 5XL | 5XL |
05 · UNDERWEAR & CLOTHING
Start with the fullest relevant measurement.
For bottoms, prioritize full hip. For tops, prioritize full bust. For one-piece styles, use the largest size indicated across bust, waist, and hip.
| US alpha size | XS | S | M | L | XL | 2XL | 3XL | 4XL | 5XL |
|---|---|---|---|---|---|---|---|---|---|
| Bust · in | 31–33 | 33–35 | 35–37 | 37–40 | 40–43 | 43–46 | 46–49 | 49–52 | 52–55 |
| Waist · in | 24–26 | 26–28 | 28–31 | 31–34 | 34–37 | 37–40 | 40–43 | 43–46 | 46–49 |
| Full hip · in | 34–36 | 36–38 | 38–41 | 41–44 | 44–47 | 47–50 | 50–53 | 53–56 | 56–59 |
This is a general NINONERA starting chart. Product-specific measurements and available size ranges take priority whenever they are shown.
06 · SHAPEWEAR
Size for your body—not the number you want to see.
Sizing down does not create better support. It can cause rolling, digging, distorted seams, and less effective smoothing.
Easy smoothing
Choose your usual size. Ideal when you want a soft layer that disappears under everyday clothing.
Defined support
Use waist and hip measurements. If they indicate different sizes, start with the larger size.
Targeted structure
Follow the product chart exactly and make sure you can sit, breathe deeply, and move without numbness.
The details that make choosing easier.
What should I do if I am between sizes?＋
Choose the larger size for gentler compression, fuller coverage, and everyday comfort. Consider the smaller size only when the product measurements support a close fit and you prefer firmer hold.
Why is my usual bra size different from the calculator?＋
Brand patterns, fabric stretch, cup shape, and personal preference can all shift fit. Treat the calculator as a starting point and use the fit checks on each product.
Which measurement matters most for a bodysuit?＋
Use the largest size indicated across bust, waist, and hip. Torso length also matters; if you are tall or have a longer torso, the larger size is usually more comfortable.
How do I know the fit is too small?＋
Pinching, rolling, numbness, difficult breathing, distorted seams, or overflow that cannot be adjusted are signs to size up.