Speedo Adult Female Swimwear 24-46

This size guide covers Speedo adult women's swimwear in numeric sizes 24–46 (equivalent to UK dress sizes 6–22). All measurements are body measurements taken from your own body, not garment measurements. Always use your bust measurement as the primary guide. International size equivalents (D, F, I, Lat Am, Aus, USA) can be expanded within the sizing table below.

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Body Measurement Points
Speedo women's swimwear body measurement diagram
How to Measure

Take all measurements directly against your skin using a soft tape measure. All measurements are body measurements, not garment measurements.

  • A
    BustMeasure around the fullest part of your chest, keeping the tape horizontal and snug but not tight.
  • B
    WaistMeasure at the narrowest part of your natural waist.
  • C
    HipMeasure around the fullest part of your hips and seat, keeping the tape horizontal.

*Waist is measured at the natural waist at narrowest point.

Sizing Table — Speedo Adult Female Swimwear (Sizes 24–46)
Sizing 2/24 4/26 6/28 8/30 10/32 12/34 14/36 16/38 18/40 20/42 22/44 24/46
International Size Equivalents
UK Dress Size 6 8 10 12 14 16 18 20 22 24 26 28
D (Germany) 28 30 32 34 36 38 40 42 44 46 48 50
F (France) 30 32 34 36 38 40 42 44 46 48 50 52
I (Italy) 34 36 38 40 42 44 46 48 50 52 54 56
Lat Am 24 26 28 30 32 34 36 38 40 42 44 46
Aus 0 2 4 6 8 10 12 14 16 18 20 22
USA — — — 0/2 4 6 8 10 12 14 16 18
Body Measurements (cm)
Bust 64–66 66–71 71–76 76–81 81–86 86–91 91–96 96–101 101–106 106–111 111–116 116–121
Waist* 48–51 52 57 62 67 72 77 82 87 92 97 102
Hip 74–76 77 82 87 92 97 102 107 112 117 122 127

*Waist is natural waist at narrowest point. All measurements are body measurements, not garment measurements.

Fit Notes
  • Always use your bust measurement as the primary guide when selecting a Speedo swimsuit size.
  • Speedo swimsuits are designed to fit closely and securely — they feel firmer than a regular fitted top, which ensures the suit stays in place during swimming.
  • If bust and hip measurements suggest different sizes, choose the size that fits your bust and check the hip falls within range.
  • Speedo swimsuits are made from chlorine-resistant fabrics that ease slightly with wear — do not size up based on initial tightness.
  • The swimsuit should feel secure across the bust and back with no gaping, pulling, or riding up.
  • Rinse in cold fresh water immediately after every use. Do not tumble dry, iron, or dry-clean.
  • Unsure? Contact our team or call +44 1827 330600.
Frequently Asked Questions — Speedo Women's Swimwear (24–46)

Measure your bust, waist, and hip against your skin with a soft tape measure. Use your bust as the primary guide and compare to the sizing table above. International size equivalents are in the collapsible section — always prioritise body measurements.

Size to your bust measurement. If your hips are significantly larger relative to your bust, try the next size up. Speak to a member of staff at Allens if you are unsure.

Yes — chlorine-resistant Speedo fabrics feel firm when new and ease slightly with regular use. Do not size up based on how the suit feels when you first try it on.

Speedo swimsuits are primarily designed for pool use. While the chlorine-resistant fabrics will withstand occasional use in open water or the sea, prolonged exposure to salt water can accelerate fabric degradation. Rinse the suit thoroughly in fresh water after every use. For dedicated open water or triathlon use, a wetsuit or open water-specific suit is recommended.

Rinse your Speedo swimsuit in cold fresh water immediately after every use to remove chlorine, salt, and sunscreen. Hand wash gently with a mild detergent if needed. Do not machine wash, tumble dry, iron, or dry-clean. Store flat and dry, away from direct sunlight.

Speedo swimsuit sizes do not directly correspond to standard clothing sizes. Always use body measurements to select the correct size. International size equivalents are shown as a secondary reference only — always prioritise body measurements.

Standard Speedo swimsuits are suitable for recreational and fitness swimming. For competitive pool swimming, Speedo's Fastskin racing range is specifically designed and World Aquatics approved. Speak to a member of staff at Allens for guidance on the right product for your level.