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Clothing and shoe size converter for AU, UK, US, CA and EU

Find your best clothing and shoe size match before you buy. SizeSwapper compares official brand size guides, AU, UK, US, CA and EU sizing, and your own measurements — the strongest fit guidance available, short of trying it on. Get a confidence rating and between-size advice, so you shop faster with less guesswork and fewer wrong-size returns.

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      This is the closest match based on available published measurements. Product-level fit may still vary.

      Reiss vs Marks & Spencer sizing

      This comparison uses visible measurement rows to map published sizes from Reiss to the closest Marks & Spencer size.

      Women tops

      Source sizeSource bust/chestSource waistSource hipClosest targetTarget bust/chestTarget waistTarget hip
      Reiss 4 79 61 86 Marks & Spencer 8 82 65 90
      Reiss 6 81.5 63.5 88.5 Marks & Spencer 8 82 65 90
      Reiss 8 84 66 91 Marks & Spencer 8 82 65 90
      Reiss 10 88 70 95 Marks & Spencer 10 86 69 94
      Reiss 12 93 75 100 Marks & Spencer 12 91 74 99
      Reiss 14 98 80 105 Marks & Spencer 14 96 79 104

      Women dresses

      Source sizeSource bust/chestSource waistSource hipClosest targetTarget bust/chestTarget waistTarget hip
      Reiss 4 79 61 86 Marks & Spencer 8 82 65 90
      Reiss 6 81.5 63.5 88.5 Marks & Spencer 8 82 65 90
      Reiss 8 84 66 91 Marks & Spencer 8 82 65 90
      Reiss 10 88 70 95 Marks & Spencer 10 86 69 94
      Reiss 12 93 75 100 Marks & Spencer 12 91 74 99
      Reiss 14 98 80 105 Marks & Spencer 14 96 79 104

      Women bottoms

      Source sizeSource bust/chestSource waistSource hipClosest targetTarget bust/chestTarget waistTarget hip
      Reiss 4 79 61 86 Marks & Spencer 8 82 65 90
      Reiss 6 81.5 63.5 88.5 Marks & Spencer 8 82 65 90
      Reiss 8 84 66 91 Marks & Spencer 8 82 65 90
      Reiss 10 88 70 95 Marks & Spencer 10 86 69 94
      Reiss 12 93 75 100 Marks & Spencer 12 91 74 99
      Reiss 14 98 80 105 Marks & Spencer 14 96 79 104
      Fit notes: Runs small (Very sleek, tailored silhouette framework) True to size / Generous hip scaling

      Sources: Reiss and Marks & Spencer official size guides. Last checked: 2026-06-20.