Why Crocs Sizing Can Be Confusing
If you've ever tried to buy Crocs online and felt confused by the sizing, you're not alone. Between unisex sizing, US vs UK conversions, and different fit types, getting the right size first time can feel like guesswork.
The good news? Once you understand how Crocs sizing works, it's actually straightforward. This guide explains everything you need to know to find your perfect fit — plus our complete Crocs size chart with UK, EU, and US conversions.
Do Crocs Run Big or Small?
The short answer: Crocs generally fit true to size, but the style matters.
Classic Clogs have a roomy, spacious fit by design. They're meant to feel relaxed rather than snug. If you're used to trainers or formal shoes that fit closely, Crocs will feel different — and that's intentional.
Here's how different Crocs styles typically fit:
Classic Clogs (Roomy Fit) — True to size, but feel spacious. If you're between sizes, most people size down.
Lined Crocs (Fuzz-lined models) — The lining takes up space inside the shoe. If you're between sizes, size up.
Crocs Sandals & Flip Flops — Generally true to size. The straps provide a more secure fit than clogs.
Crocs Baya & LiteRide — True to size with a more secure, athletic feel compared to Classic Clogs.
UK vs US Sizing: The Crocs Confusion
Here's where most people get tripped up: the size stamped on your Crocs is in US sizing, not UK.
When you order from a UK retailer, you'll select your UK size. But when your Crocs arrive, the size printed on the shoe will be the US equivalent. This catches people out constantly — they think they've been sent the wrong size when actually the conversion is correct.
For example, if you order UK size 7 (women's), the shoe will be stamped US 9. That's not a mistake — that's the correct conversion.
Our Crocs size guide shows exactly how UK sizes convert to US and EU, so you can double-check your order is correct when it arrives.
Crocs Size Chart: UK to US Conversion
Unisex Crocs (Classic Clogs)
Most Crocs Classic Clogs are unisex, which means they use a combined men's/women's sizing system. Here's how it works:
| Crocs Size | UK Men's | UK Women's | EU | US Men's | US Women's |
|---|---|---|---|---|---|
| M3/W4 | 3 | 4 | 36.5 | 4 | 6 |
| M4/W5 | 4 | 5 | 37.5 | 5 | 7 |
| M5/W6 | 5 | 6 | 38.5 | 6 | 8 |
| M6/W7 | 6 | 7 | 39.5 | 7 | 9 |
| M7/W8 | 7 | 8 | 41.5 | 8 | 10 |
| M8/W9 | 8 | 9 | 42.5 | 9 | 11 |
| M9/W10 | 9 | 10 | 43.5 | 10 | 12 |
| M10/W11 | 10 | 11 | 44.5 | 11 | - |
| M11/W12 | 11 | 12 | 45.5 | 12 | - |
| M12 | 12 | - | 45.7 | 13 | - |
→ View our complete Crocs size guide with all styles
What If I'm Between Sizes?
Crocs don't come in half sizes, so if you're usually a UK 6.5 or 7.5, you'll need to choose between two whole sizes.
The general rule:
Size DOWN if:
- You're buying Classic Clogs or any "Roomy Fit" style
- You prefer a more secure fit
- You have narrow feet
Size UP if:
- You're buying lined/fuzz-lined Crocs
- You have wide feet
- You plan to wear thick socks with them
- You prefer extra room to move
Understanding Crocs Fit Types
Crocs uses three different fit types across their range. Knowing which fit a style has helps you predict how it will feel:
Roomy Fit — Spacious and relaxed with room to move. This is the Classic Clog fit that Crocs are famous for. Your heel should sit comfortably against the back strap with a bit of space around your toes.
Relaxed Fit — Slightly more contoured than Roomy but still comfortable. Found on styles like some sandals and casual shoes.
Standard Fit — Closer to a traditional shoe fit. More secure with less room. Common on Crocs with laces or straps.
How Should Crocs Fit?
A properly fitting Crocs Classic Clog should:
- Allow your heel to rest comfortably against the back strap
- Give your toes some wiggle room (they shouldn't touch the front)
- Feel secure when you walk — your foot shouldn't slide around excessively
- Not pinch or rub anywhere
Remember, Crocs are designed to feel roomy. If you're used to snug-fitting trainers, the Classic Clog will feel different — that's normal and intentional.
Will Crocs Stretch or Loosen Up?
Crocs are made from Croslite foam, which softens slightly with body heat and wear. If your new pair feels a touch snug, they often relax within a few uses.
However, they won't stretch significantly like leather shoes might. If a pair is painfully tight or your toes are pressing against the front, they're too small — don't expect them to stretch enough to become comfortable.
Kids' Crocs Sizing
Kids' Crocs follow a similar pattern to adult sizing, but with some differences:
Toddler sizes (C4-C10) — For younger children. These run smaller and are designed for little feet.
Junior sizes (J1-J6) — For older children. J6 is roughly equivalent to a small adult size, so older kids may be able to wear adult Crocs.
For children between sizes, sizing up is usually the safer choice — they'll grow into them, and Crocs are designed to have some room anyway.
Quick Sizing Tips
Measure your feet in the afternoon. Feet swell throughout the day, so measuring later gives you a more accurate size for all-day comfort.
Check the style's fit type. A size 8 in a Roomy Fit Classic Clog will feel different to a size 8 in a Standard Fit LiteRide.
Read reviews. Customer reviews often mention whether a particular style runs large or small compared to other Crocs.
Don't panic about the US size. The size printed on your Crocs will be in US sizing. Use our size guide to confirm your UK to US conversion.
Still Not Sure? We Can Help
If you're unsure which size to order, our customer service team is happy to help. And if your Crocs don't fit perfectly, we offer easy returns within 30 days.
→ View Our Complete Crocs Size Guide
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