Sweaty Betty Sizing at a Glance

AI-generated generic editorial illustration — not a retailer product photo and does not depict the reviewed product or service. Editorial illustration supporting this section.

Sweaty Betty's size guide is a single page with jump links to Leggings, Trousers, General, Bras, Shoes and International Conversions. It also has sections on how to measure, what to do between sizes, and returns. For clothing, the UK run on the chart goes from 6/XXS to 18-20/XXL, and the 16-18 size shares the XL label.

This guide reads that page alongside the brand's leggings and sports bra category pages. Those pages add filters for fit, length, support level, cup size and activity. Between them they cover the questions most online shoppers have. Which size column do my measurements point to? How long should the leg be? Which sports bra comes in my cup?

A note on method: everything here comes from Sweaty Betty's public pages. This guide has not tried the garments on or tested them independently, so it offers no verdicts on how a pair of leggings feels or how a bra performs. Where the pages say nothing, we say so. If you have not taken your measurements yet, do that first using the how-to-measure guidance linked from the brand's size guide.

How to Read the Sweaty Betty Size Chart

AI-generated generic editorial illustration — not a retailer product photo and does not depict the reviewed product or service. Help readers match their own measurements to the official UK size chart columns.

Help readers match their own measurements to the official UK size chart columns

The general chart pairs seven UK size columns with alpha labels: 6/XXS, 8/XS, 10/S, 12/M, 14/L, 16-18/XL and 18-20/XXL. Each column gives a bust, waist and hip measurement in centimetres and inches. Find your row, then find the column closest to your number.

UK size Bust Waist Hips
6 / XXS 77 cm (30 in) 59 cm (23 in) 86 cm (34 in)
8 / XS 82 cm (32 in) 64 cm (25 in) 91 cm (36 in)
10 / S 87 cm (34 in) 69 cm (27 in) 96 cm (38 in)
12 / M 92 cm (36 in) 74 cm (29 in) 101 cm (40 in)
14 / L 97 cm (38 in) 79 cm (31 in) 106 cm (42 in)
16-18 / XL 102 cm (40 in) 84 cm (33 in) 111 cm (44 in)
18-20 / XXL 109 cm (43 in) 91 cm (36 in) 118 cm (46.5 in)

The pattern is simple. Bust, waist and hips all rise in 5cm steps from the smallest size up to 16-18, then step up by 7cm into 18-20/XXL. The leggings and trousers charts use the same waist and hip figures as the general chart, so you do not need to learn a second set of numbers for bottoms. Bust is listed only on the general chart.

The size guide also includes how-to-measure and between-sizes sections and a link to returns information. Those are worth reading before you order, especially if your bust, waist and hips fall in different columns.

Leggings Size Range and Fit Options

The leggings category page is the clearest guide to breadth. At the time of capture it listed 138 products, with size filters running from XXS to 4XL. Counts were highest in the middle of the range, for example S (107), XS (98) and M (97). They were much lower at the far end, with 3XL on 3 products and 4XL on 2.

On fit, 76 products were tagged Tight. Smaller groups were tagged Flare (6), Wide Leg (4) and Straight Leg (1). If you prefer a closer fit, the range is built around it. If you want a wider shape, the options exist but are limited. The merchant's own copy points to its flared leggings for a wider shape and its high-waisted range for extra coverage.

Collections are a second way in. The page lists Power (68), Ultimate Studio (14), All Day (12), Super Soft (12), Runner's High (10), Therma Boost (6), Super Sculpt (4) and Ultimate Move (4). The merchant describes Power as its all-round leggings for HIIT, strength and running.

Features can be filtered too, including side pockets, back pockets, high-waisted, compression, supportive, ultra-lightweight and thermal. "Supportive" and "Compression" are the merchant's labels, and this guide cannot say how either feels in wear. All of these counts are a snapshot and will change as the range does.

Leggings Leg Lengths and Inseams

AI-generated generic editorial illustration — not a retailer product photo and does not depict the reviewed product or service. Let readers choose a leggings or trouser length from the published inseam labels and the short-length tip.

Let readers choose a leggings or trouser length from the published inseam labels and the short-length tip

Sweaty Betty publishes four leggings inseams:

Length Inseam Where it sits
Capri 43 cm Not described on the page
Crop 50 cm Just below the knee
7/8th 60 cm Just above the ankle
Full length 68 cm Just above trainers

On the category page, Full Length (115) and 7/8 Length (66) were the most common lengths. Only 5 products were Cropped and 1 was Capri. If you want a shorter leg, choice is thin. The length counts add up to more than the 138 products listed, so do not treat them as a simple split.

One caution: the leggings table gives the crop as 50cm but shows an inch figure of 17, which does not match (50cm is nearer 20 inches). The same 17 inches appears against the 43cm capri. Treat the centimetre figure as the safer one and check the product page.

Trousers vary by style, so the page lists them separately:

  • Gaia Yoga: Capri 61 cm, Short 67 cm, Regular 81 cm
  • Gary Taper: Short 63.5 cm, Regular 68.5 cm
  • Gary Luxe: Short 66 cm, Regular 71 cm
  • Explorer: Regular 63.5 cm
  • Power Kick Flares: Short 76 cm, Regular 81 cm

Each trouser entry carries the same tip: if you are 5'4" or under, the merchant recommends trying the Short length. Inseam is style-specific, and a trouser "Capri" is a different length from a leggings Capri. Confirm the figure on the product page you are buying from.

Sports Bra Sizing and Cup Range

AI-generated generic editorial illustration — not a retailer product photo and does not depict the reviewed product or service. Walk readers through converting UK band and cup size to an alpha size, then filtering by support level and activity.

Walk readers through converting UK band and cup size to an alpha size, then filtering by support level and activity

Sweaty Betty's bra guide is a cup-to-alpha conversion chart. UK bands from 30 to 44 run across the top and cup sizes run down the side. Each cell gives an alpha size from XS to XXXL. You look up your usual band and cup, and the cell tells you which alpha size to look for.

The same alpha size can cover several band and cup combinations. Cup A at band 34 is an S, and so is cup C at band 34. Cup C at band 36 is an M. The chart also shows "No options available" in the D cup row at band 44. Read the full chart for your own band and cup, including the DD to F rows, rather than relying on these examples.

The sports bra category page then lets you filter by cup. At the time of capture it listed 54 products with cup filters from A to F. A to E each covered roughly 37 to 40 products, while F covered 8. If you need an F cup, expect a much shorter list, and note that the filter will show you which styles are included. Filtering by cup before browsing is the quickest way to avoid falling for a style that does not come in your size.

Sports Bra Support Levels and Activities

The sports bra page sorts products by support level, activity and collection. Among the 54 products, the support filter showed Light (4), Medium (26) and High (9). That adds up to 39, so not every product carries a support tag. The page does not define the levels, so read the product description for detail.

Activity filters were Run (39), Gym + Workout (29), Yoga + Pilates (13) and Casual + Everyday (2). Collections were Power (21), Stamina (7), Spirit (6) and Ultimate Studio (5).

The merchant describes its bras as having breathable, sweat-wicking fabrics and secure straps, and says the range includes styles designed for different support levels. It positions Power bras to pair with Power leggings and suggests filtering by support and style to find your best fit.

A sensible starting point is the activity you do most. Pick the filter that matches it, add your cup size, then use the support level as a further narrowing step. Treat the merchant's descriptions as the merchant's own claims. This guide has not tested support performance.

Where the Published Sizing Information Runs Out

Sweaty Betty's published material is useful, but it has gaps:

  • Range ends at XXL on the chart. The chart stops at 18-20/XXL. Sizes 3XL and 4XL appear in the leggings filters, but only on 3 and 2 products. The captured size guide gives no measurements for them.
  • No petite or tall chart. The captured text has no dedicated petite or tall section. Height guidance is limited to the Short length tip for 5'4" or under on certain trouser styles.
  • Combined columns. 16-18 is a single column, so if you sit at either edge you may need to check product pages.
  • No fabric or stretch detail. Waist and hip steps are the same across categories, so the chart cannot tell you how a given style stretches or feels.
  • Inconsistent figures. The crop inseam in inches does not match its centimetres. The Explorer trousers list only a Regular inseam, even though the Short-length tip appears beneath them.
  • Snapshot data. Category counts and filters change, and the support level counts do not cover every product.
  • No hands-on testing. This guide has not tested the garments, so it cannot judge real-world fit, compression or support.

If you need plus-size or specialist coverage, treat the chart as a starting point and look for a dedicated plus-size sizing guide before you buy.

Who Sweaty Betty Sizing Suits

Readers within UK 6 to 20. You get a full measurement chart and wide availability across the main sizes, according to the filter counts.

Runners. Run is the largest activity filter on both leggings (92) and sports bras (39), so there are more filtered options here than for other activities.

Shorter readers. The merchant gives a stated route on certain trouser styles: try the Short length if you are 5'4" or under. For leggings, short options are limited by the length counts.

Readers needing sizes above XXL or an F cup. Based on category counts, choice is narrower. Check each product page.

Readers comparing brands. How other high-street names size their ranges, including Uniqlo, Next and White Stuff, is covered in separate guides.

How to Choose Your Size Step by Step

  1. Measure. Take your bust, waist and hip measurements using the how-to-measure guidance on the size guide.
  2. Match to the chart. Compare your numbers with the UK chart above. Leggings and trousers use waist and hips. Tops and dresses also use bust.
  3. Handle in-between measurements. If your measurements fall in different sizes, follow the merchant's between-sizes guidance and check the product page.
  4. Choose a length. Pick from the inseam table (Capri, Crop, 7/8th or Full Length). On trouser styles, try Short if you are 5'4" or under.
  5. For sports bras, convert first. Find your UK band and cup in the cup-to-alpha chart, then filter the category by your cup and a support level.
  6. Confirm on the product page. Styles vary, so check the final size and inseam there before ordering.
  7. Know the returns route. If a size does not work, use the merchant's returns information. Read it before you buy.

Frequently Asked Questions

What size range does Sweaty Betty offer?

The size chart runs from UK 6/XXS to 18-20/XXL. The leggings filters also list 3XL and 4XL, but only on a very small number of products at the time of capture.

What leg lengths do Sweaty Betty leggings come in, and what if I am 5'4" or under?

Leggings inseams are Capri 43 cm, Crop 50 cm, 7/8th 60 cm and Full Length 68 cm. Trouser styles list their own Short and Regular inseams. For those trousers, the merchant recommends trying Short length if you are 5'4" or under. The leggings table lists no Short option, so check each product page.

How do I find my Sweaty Betty sports bra size and support level?

Look up your UK band (30 to 44) and cup in the cup-to-alpha conversion chart. Then use the sports bra filters for cup size, activity and support level (Light, Medium or High). Not every product has a support tag. The page does not define the levels, so read the product description.

Does Sweaty Betty offer sizes above XXL?

The chart stops at 18-20/XXL. The leggings category showed 3XL on 3 products and 4XL on 2. The captured size guide gives no measurements for those sizes, so check the product page.

What should I do if I am between sizes?

The size guide has a between-sizes section, and its content is not reproduced here, so read it. Compare your bust, waist and hips with the chart, then check the individual product page. The 16-18 size is one combined column, so those at its edges should check product pages especially.

Sources

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