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.
Popular examples- AU 12 → US 8
- Zara M → ASOS 10
- EU 39 → US 8
- Between sizes? We guide you to tighter or roomier fits
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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 size | Source bust/chest | Source waist | Source hip | Closest target | Target bust/chest | Target waist | Target 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 size | Source bust/chest | Source waist | Source hip | Closest target | Target bust/chest | Target waist | Target 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 size | Source bust/chest | Source waist | Source hip | Closest target | Target bust/chest | Target waist | Target 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.