Sports Bra Size Chart: Three Brand Charts From XXS to 7X

The bra in your drawer says 38D, the sports bra comes in L, XL and 2X, and the L you guessed either bounces on the first run or flattens you. Picking by band alone looks safe, but on Nike’s chart every band from 34 to 46 is split across two letter sizes: A to C cups in one, D and E cups in the next one up, so a 38D is an XL there, not an L. Below are three brands’ sports bra size charts row by row, what each one asks you to measure, and what to do when you land between two rows.

The short answer

Chart	Sizes	What it asks for	Range it prints
Nike sports bras	XXS to 4X, or XS (A–C) to 4X (F–G)	Your band and cup size	28A to 50C; cups A to G (DDDD)
SHEFIT Ultimate and Flex	XSmall to 6Luxe	Bust and rib cage, in the same row	Bust 29 to 55 in
Superfit Hero	L to 7X	Bust only	Bust 39 to 71 in

Step 1: Check what the chart asks for

Before you measure anything, look at the column headings. The three charts above want three different things:

• Your bra size. Nike’s page says its charts “convert your regular bra size into Nike Sports Bra sizes”, so you read across from a band and cup, such as 38D.
• Two tape numbers. SHEFIT asks for your bust and your rib cage, and says both “should fit within the same size row”.
• One tape number. Superfit Hero’s chart reads off your bust: “No band or cup sizes necessary.”

If your everyday bra size is a guess, or the bra no longer fits, measure first; the tape method is in how do i measure my bra size.

Step 2: Measure the way that chart says

The same word can mean a different spot on your body. Measure for the chart you are about to read:

1. Under the bust, snug (Nike’s calculator). Around the bottom band of your bra, just under the breast; the tape “should feel snug”, and you round up.
2. Rib cage, tight (SHEFIT). “Measure tightly around your rib cage directly under your bust.”
3. Bust (SHEFIT and Superfit Hero). Around the fullest part. SHEFIT says to do it while wearing a bra; Superfit Hero says at the widest point.
4. Nike’s cup is a half measurement. For its calculator, the tape goes across the fullest point of one breast, from the center of your chest to where the breast tissue ends at the side, not all the way round. These two numbers go into the calculator at the top of Nike’s size page, which returns the size; Nike’s charts in step 3 start from a bra size, not inches.

Write each number down with where you took it (our suggestion). A band number from a different method is not interchangeable (our reading): Glamorise’s bra size calculator takes the band “under your arms just above your bust”, which is a different place from the under-the-bust number Nike and SHEFIT ask for.

Step 3: Read the row

Nike: from your bra size to a letter size

This is Nike’s band-and-cup chart, copied cell by cell. Nike writes DD as E, DDD as F and DDDD as G.

Nike size	Band and cup sizes in it
XXS	28A–28E
XS	30A–30E, 32A–32B
S	32C–32E, 34A–34C
M	34D–34E, 36A–36C
L	36D–36E, 38A–38C
XL	38D–38E, 40A–40C
XXL	40D–40E, 42A–42C
1X	42D–42E, 44A–44C
2X	44D–44E, 46A–46C
3X	46D–46E, 48A–48C
4X	48D–59E (as printed), 50A–50C

The “59E” in the 4X cell is printed that way on Nike’s page; its cup-sized chart below puts 48D–48E in 4X (C–E).

If you wear an F (DDD) or G (DDDD) cup, the chart above has no row for you. Nike’s second chart splits each letter size by cup, and its instruction is to “find your usual size (XS–4X), then find your usual cup size (A–G)”. The rows from M up, as printed:

Nike size	(A–B)	(C–E)	(F–G)
M	36A–36B	36C, 34D–34E	34F–34G
L	38A–38B	38C, 36D–36E	36F–36G
XL	40A–40B	40C, 38D–38E	38F–38G
XXL	42A–42B	42C, 40D–40E	40F–40G
1X	44A–44B	44C, 42D–42E	42F–42G
2X	46A–46B	46C, 44D–44E	44F–44G
3X	48A–48B	48C, 46D–46E	46F–46G
4X	50A–50B	50C, 48D–48E	48F–48G

XS and S are split differently on the same chart: XS (A–C), XS (D–E) and XS (F–G); S (A–C), S (C–E) and S (F–G).

SHEFIT Ultimate and Flex: bust and rib cage

SHEFIT’s Ultimate and Flex sports bras share this chart. Find the row that holds both of your numbers.

SHEFIT size	Bust (in)	Rib cage (in)
XSmall	29–31	22–27
Small	32–35	25–32
Medium	35–38	26–33.5
Luxe	38–40	29–36
1Luxe	40–42	31–38
2Luxe	42–44	32–40
3Luxe	44–46	35.5–43
4Luxe	46–49	37.5–44
5Luxe	49–52	37–47.5
6Luxe	52–55	38.5–49.5

Use the chart for the bra you are buying. SHEFIT prints separate charts for its Emerge bra and its other bra styles, and the same name moves: a Luxe is a 29–36 inch rib cage here and 33.5–36 on the “Other bra styles” chart. In SHEFIT’s words, choose by the measurements “rather than assuming the same size name has identical measurements across every collection.”

No tape? SHEFIT’s page also takes your current US band (28 to 50) and cup (A to I) as a starting point for Ultimate and Flex, then tells you to confirm it against this chart.

Superfit Hero: bust only

Superfit Hero size	US size	Bust (in)
L (EarthFit)	12-14	39-42
XL (WaterFit)	16-18	43-46
2X (AirFit)	18-20	47-50
3X (FireFit)	22-24	51-54
4X (StarFit)	26-28	55-58
5X (NovaFit)	30-32	59-62
6X (GalaxyFit)	34-38	63-66
7X (InfiniFit)	40-44	67-71

The same page lists waist and hips for its other pieces; for bras and tops it asks for the bust alone.

When you land between two rows

Take one made-up reader with a 46 inch bust and a 38 inch rib cage (our arithmetic). On SHEFIT’s Ultimate and Flex chart, 46 is the top of 3Luxe and the bottom of 4Luxe, and 38 is inside both rib cage ranges, so both rows fit. On Superfit Hero’s chart the same bust is an XL. Same body: 3Luxe or 4Luxe at one brand, XL at the other. What each brand says to do:

• SHEFIT, both rows fit: “the larger size offers more coverage and the smaller size more compression.” Pick by which you want more.
• SHEFIT, your two numbers point to different rows: the page asks you to send your measurements and the style to its fit experts.
• Superfit Hero: its bust ranges do not overlap, but a 42.5 inch bust falls in the gap between L (39-42) and XL (43-46) (our reading). The brand offers a personal recommendation if you contact it with your measurements.
• Nike: wherever both charts have a row, they agree (our comparison), apart from the “59E” cell noted above. The second one adds F and G cups, and on each band from 34 to 48 they sit in the same letter size as that band’s D and E: 36D through 36G are all L.
• Past the end of a chart: Nike’s charts stop at a 50 band and a G cup, SHEFIT’s at a 55 inch bust, Superfit Hero’s at a 71 inch bust. A size past the last row is not on that chart; check another brand’s chart instead of rounding down (our suggestion).

Reading UK cup letters on a US chart

SHEFIT asks for your US band and cup. Nike’s page does not name a sizing system; its cup list (D, E (DD), F (DDD), G (DDDD)) follows US-style lettering (our reading). If your bra tag is UK-sized, convert the cup first. Freya’s international size guide prints these pairs:

UK cup	US cup
DD	DD
E	DDD
F	G
FF	H
G	I

Then line the US letter up with the brand’s own: a US DDD is Nike’s F (DDD), and the next cup, US G, is Nike’s G (DDDD) (our alignment, by position). The rest of the letters, to O, are in our bra size conversion chart.

Check the fit when it arrives

1. Set the adjustments first. SHEFIT’s Ultimate or Flex sports bra “arrives ready for you to adjust”: close the zip, cinch the rib band, then set the shoulder straps.
2. Band. On Nike’s checklist, the underband stays put when you raise your arms and sits level on your ribs with room for two fingers underneath.
3. Straps and cups. Straps should not dig or slip, and the fabric should cover you without gaping or bulging.
4. Bounce. Nike suggests five jumping jacks or a move from your workout. If there is too much bounce, its fix is a higher-support style, a wider strap or a racerback.
5. Before ordering two sizes, read the brand’s returns page (our suggestion).

If you are still choosing the bra itself, our plus size sports bra picks list the band and cup range each one sells. The other measuring walkthroughs are in size guides.

Where these numbers come from

The rows are copied from Nike’s sports bra size chart, SHEFIT’s Fit Central charts, Superfit Hero’s size chart and Freya’s international size guide, with Glamorise’s band step from its bra size calculator page, all read on 3 November 2026. The worked example and the Nike letter alignment are our arithmetic.

Frequently asked questions

What size sports bra is a 38DD?

On Nike's chart, an XL. Nike writes DD as E, and both of its charts put 38D to 38E in XL; the cup-sized one calls that size XL (C–E). SHEFIT's no-tape tool takes 38DD as a starting point for Ultimate and Flex, then asks you to confirm on the bust and rib cage chart; Superfit Hero sizes by bust alone, so measure and read its rows.

Is a sports bra the same size as a regular bra?

It depends on whose chart you are reading. Nike's charts convert your regular band and cup size into its letter sizes. SHEFIT's charts use your bust and rib cage in inches, and Superfit Hero's uses your bust alone and says no band or cup sizes are necessary.

Should I size up or down in a sports bra?

None of these three charts gives a blanket rule. On SHEFIT's, if both measurements fit two rows, the larger size gives more coverage and the smaller one more compression. Nike's fix for too much bounce is a higher-support style, a wider strap or a racerback.

What size is 2X in a sports bra?

It depends on the brand. On Nike's charts, 2X is 44D to 44E and 46A to 46C, and its cup-sized chart adds 44F to 44G as 2X (F–G). On Superfit Hero's chart, 2X is a 47 to 50 inch bust, and SHEFIT's sports bra charts do not use 2X at all: their sizes run from XSmall to 6Luxe.