US to UK Plus Size Converter 👗
Stop guessing your size! The definitive US to UK plus size conversion chart, interactive calculator, and fit tips for every type of plus size retailer.
Shopping across the Atlantic? You are not alone in the sizing maze. The golden rule is simple: a UK size is exactly 2 sizes smaller than the US number (US 22 = UK 26). But the reality isn't always that straightforward—different retailers, fabrics, and body shapes add complexity. This comprehensive guide provides the definitive conversion chart, an interactive size calculator, and insider tips for navigating popular plus size retailers across the US and UK. Whether you're ordering a statement dress or everyday essentials, you'll shop with total confidence and zero returns.
Select your known size and the direction you're converting, then click to instantly see your international equivalent. No more guesswork at checkout!
US to UK Plus Size Conversion Chart
Below is the complete, printable conversion chart covering US sizes 12 through 34. For plus size shoppers, the 16-34 range is where you'll do most of your converting. The highlighted row marks the pivotal US 18 / UK 22 crossover—a common size where many plus size shoppers begin their journey.
| 🇺🇸 US Size | 🇬🇧 UK Size | EU Size | AU Size | Bust (in) | Waist (in) | Hip (in) |
|---|---|---|---|---|---|---|
| 12 | 16 | 42 | 16 | 39-40 | 31-32 | 41-42 |
| 14 | 18 | 44 | 18 | 41-42 | 33-34 | 43-44 |
| 16 | 20 | 46 | 20 | 43-44 | 35-36 | 45-46 |
| 18 | 22 | 48 | 22 | 45-46 | 37-38 | 47-48 |
| 20 | 24 | 50 | 24 | 47-48 | 39-40 | 49-50 |
| 22 | 26 | 52 | 26 | 49-50 | 41-42 | 51-52 |
| 24 | 28 | 54 | 28 | 51-52 | 43-44 | 53-54 |
| 26 | 30 | 56 | 30 | 53-54 | 45-46 | 55-56 |
| 28 | 32 | 58 | 32 | 55-56 | 47-48 | 57-58 |
| 30 | 34 | 60 | 34 | 57-58 | 49-50 | 59-60 |
| 32 | 36 | 62 | 36 | 59-60 | 51-52 | 61-62 |
| 34 | 38 | 64 | 38 | 61-62 | 53-54 | 63-64 |
US to UK: Add 2 to your US size. UK to US: Subtract 2 from your UK size. Example: US 22 + 2 = UK 26. UK 26 — 2 = US 22. Easy to remember, but always check individual retailer size guides for the most accurate fit!
The UK and US sizing systems diverged decades ago, and the gap has never been standardized. The result is the "+2 rule" that every plus size shopper needs to know: a UK size is exactly 2 sizes larger than the equivalent US size. This means if you typically wear a US 20 at a US plus size specialty retailer, you'll need a UK 24 when shopping at UK-based plus size retailers.
Why does this matter so much for plus size shoppers specifically? Because the 2-size gap becomes more psychologically significant as sizes increase. Seeing "UK 28" when you're used to "US 24" can feel jarring—but it's simply a labeling difference, not a reflection of your body. The garment measurements are identical. Understanding this intellectually and emotionally is key to stress-free international shopping.
"Your size is just a number on a tag—and that number changes depending on which side of the Atlantic you're shopping on. The fit is what matters, not the label."
While the +2 rule is the foundation, individual retailers add their own twist to sizing. Some run generous, others run snug. Here's what to expect from different types of plus size retailers, so you can shop with precision instead of crossing your fingers at checkout.
Pro tip: Always check the fabric composition before ordering. Retailers using high elastane/spandex content (5% or more) will have more stretch and forgiveness. Rigid woven fabrics like non-stretch denim or tailored blazers require more precise sizing—when in doubt, size up and tailor down. For detailed fit breakdowns of specific retailers, explore our plus size brand reviews.
Your measurements are the ultimate truth-tellers in international sizing. Sizes fluctuate between retailers, but your body measurements (in inches or centimeters) don't lie. Use a soft measuring tape and follow these guidelines for the most accurate results.
- ✓ Bust: Measure around the fullest part of your bust, keeping the tape parallel to the floor. Wear an unpadded bra that fits well. Don't pull the tape too tight—it should be snug but not compressing.
- ✓ Waist: Find your natural waist—the narrowest point, usually an inch above your belly button. Measure with your breath held naturally (not sucked in). This is your true waist, not where your jeans sit.
- ✓ Hip: Measure around the fullest part of your hips and bottom, usually 8-9 inches below your natural waist. Keep the tape level all the way around.
- ✓ Inside Leg: Measure from the top of your inner thigh to where you want the hem to fall. Helpful for trousers and jeans, especially with UK retailers that list inside leg lengths.
Measure yourself every 3-6 months, even if your weight hasn't changed. Bodies shift, and knowing your current measurements prevents ordering based on outdated assumptions. Keep a note in your phone with your latest numbers for quick reference while shopping.
Even seasoned international shoppers make these mistakes. Protect your wallet and your time by learning from the most frequent conversion errors.
- ⚠ Assuming all retailers use the same sizing. A US 20 at one plus size retailer may fit differently than a US 20 at another. Always check the specific retailer's size chart.
- ⚠ Forgetting that shoes also convert differently. UK shoe sizes are typically 2 sizes smaller than US (US 9 = UK 7), not the same as clothing. Don't mix up the rules!
- ⚠ Ignoring fabric and cut descriptions. An oversized boyfriend blazer in UK 24 will fit very differently than a bodycon dress in UK 24—even from the same retailer.
- ⚠ Ordering without checking return policies. International returns can be expensive or impossible. Always verify the return window, who pays for return shipping, and whether refunds include original shipping costs.
Ordering from across the pond means preparing for the possibility of returns. UK retailers shipping to the US (and vice versa) have varying policies that can significantly impact your shopping experience.
UK to US shoppers: Large UK multi-brand platforms have improved their international return processes significantly in recent years. Many now offer prepaid return labels with the cost deducted from your refund. Smaller UK plus size boutiques typically require you to cover return shipping, which can range from $15-$30 depending on the courier. Always keep your original packaging and return labels until you're certain you're keeping the items.
US to UK shoppers: Major US plus size retailers generally ship internationally, but return shipping is almost always at the customer's expense. Premium US brands often use third-party international shipping partners, and return costs can be steep. Before ordering, calculate the potential return shipping cost and factor it into your purchase decision—sometimes it's worth ordering two sizes with the intention of returning one, splitting the return cost across multiple items. For a detailed breakdown by retailer, visit our international returns guide.
Scenario 1: The Stretchy UK Dress. You typically wear a US 22 and fall in love with a stretch jersey dress from a UK plus size retailer. According to the chart, you're a UK 26. But because the fabric is highly stretchy (95% viscose, 5% elastane), you could comfortably size down to a UK 24 for a more fitted silhouette—or stick with the UK 26 for a relaxed fit. Check the model's stats in the product description for additional guidance.
Scenario 2: The UK Denim Gamble. You're a US 20 in jeans. UK plus size denim follows standard conversion, so you'd start at a UK 24. However, denim sizing is notoriously inconsistent across retailers—some styles run large, others run small. Read at least 5-10 reviews from shoppers with similar body types, and pay attention to comments about waist gaping or tight calves. When in doubt, order two sizes and return the one that doesn't fit.
No. A US size 18 is equivalent to a UK size 22. The numbers look similar, but they represent different measurements. If you accidentally order a UK 18 thinking it's the same as your US 18, you'll receive a garment two sizes too small. Always apply the +2 rule when converting from US to UK.
The UK and US sizing systems evolved independently, with different starting points for what constitutes a "size 0" or "size 4." Neither system has ever been internationally standardized, which is why the 2-size gap exists consistently across the size spectrum. The difference is purely historical—garment measurements for equivalent sizes are essentially identical once you account for the label difference.
Yes, but the conversion is different. UK shoe sizes are typically 2 sizes smaller than US women's shoes (US 9 = UK 7). This is completely separate from clothing size conversion. Several UK plus size retailers offer wide-fit and extra-wide-fit shoe options in UK sizing, which is excellent news for plus size shoppers who need comfortable, stylish footwear. Always check the specific retailer's shoe size chart before ordering.
If your measurements fall between two sizes, your choice depends on the garment type and fabric. For stretchy fabrics (jersey, ribbed knit, anything with elastane), size down for a more fitted look. For rigid fabrics (structured denim, tailored blazers, non-stretch cotton), size up—you can always have a garment taken in, but you can't add fabric that isn't there. Reading reviews from shoppers with similar measurements is your best strategy when you're truly between sizes.
Generally, no—once you account for the 2-size label difference, the actual garment measurements are very similar. However, UK plus size retailers often use more stretch fabrics and design with a slightly more relaxed fit through the hip and thigh compared to some US retailers. This varies by retailer and style, not by country. Always rely on the specific retailer's measurement chart rather than generalizations about which country "runs bigger." For detailed comparisons, check our plus size brand reviews.
Most major UK plus size retailers provide accurate measurement charts on their websites. However, these charts typically reflect the body measurements the garment is designed to fit, not the garment's actual measurements. If you're unsure, look for "garment measurements" in the product description, which tell you the actual flat or circumference measurements of the item. Comparing these to a similar item you already own and love is one of the most reliable ways to predict fit.
Size conversion anxiety is real—but it doesn't have to control your shopping experience. With the definitive chart, the +2 golden rule, and your own accurate measurements in hand, you're equipped to shop any UK or US plus size retailer with total confidence. The number on the tag is just a starting point; the fit on your body is what truly matters.
UK plus size retailers offer incredible style, quality, and size inclusivity that's absolutely worth navigating the conversion for. US retailers are equally accessible to UK shoppers who know their converted size. The global plus size fashion market is yours to explore—now you have the map. For more shopping guides, brand reviews, and style inspiration curated specifically for plus size women, explore our full collection of size guides, brand reviews, and style tips.
About the PlusSizePlus Editorial Team
This article was researched, written, and reviewed by the PlusSizePlus Editorial Team. Our team creates educational resources covering plus size fashion, international size conversion, shopping guides, brand comparisons, and body-positive style advice. Every article is written to be clear, practical, and as accurate as possible based on publicly available sizing standards and retailer information. We review our articles periodically to keep them up to date as sizing conventions and brand policies evolve.
Disclaimer: This article is intended for educational and informational purposes only. Size conversions presented are based on standard international sizing conventions and may vary between individual brands, specific garments, and fabric types. Always consult the specific retailer's official size chart and return policy before making a purchase. For important limitations and how this content should be used, please read our full Disclaimer.
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