You’ve found the perfect pair of heels online. The price is right, the color is dreamy, and the style is exactly what your wardrobe has been missing. You click on your size, but then you freeze. The size chart says “37.” You’re a size 7 in the US, or maybe a 5 in the UK, and suddenly that simple number feels like a secret code. If this scenario sounds familiar, you’re not alone. Navigating international shoe sizes is one of the most frustrating parts of shopping for footwear, especially when you can’t try them on first. Let’s decode that mysterious “37” once and for all, so you can shop with confidence and stop playing the guessing game.

The Short Answer: What Size Is 37 in Women’s Shoes?

Let’s cut to the chase. In the most commonly used international sizing system, a women’s shoe size 37 corresponds to a US size 6.5 to 7. If you’re in the UK, that’s a size 4.5 to 5. In Japan, it’s a 23 to 23.5, and in Mexico, it’s typically a size 5.5. But here’s the catch: these conversions are not set in stone. A size 37 from a European luxury brand like Gucci might fit differently than a size 37 from a fast-fashion retailer like Zara. The number is a starting point, not a guarantee.

Why Shoe Sizing Is So Confusing

To understand why a size 37 can feel like a moving target, you need to know a little about how shoe sizes are created. Most of the world uses one of three main systems: the US standard, the UK standard, and the European (EU) standard. The EU system, which includes size 37, is based on the length of the last—the mold that the shoe is built around—measured in Paris points. One Paris point equals two-thirds of a centimeter. So a size 37 roughly translates to a last length of about 24.7 centimeters, or 9.7 inches. That’s the average length of a foot that fits a US women’s 7.

But length is only half the story. Shoe width, toe shape, heel height, and even the material of the shoe can dramatically change how a size 37 feels. A pointed-toe pump in a size 37 might pinch your toes if you have a wider foot, while a round-toe sneaker in the same size could feel roomy. Brands also use different lasts, which is why you can be a size 37 in one brand and a 38 in another. It’s not you—it’s the system.

How to Measure Your Foot for a Size 37

Before you buy any shoe, especially online, measure your foot at home. It’s easy and will save you countless returns. Here’s how to do it:

  • Place a piece of paper on a hard floor against a wall.
  • Stand on the paper with your heel touching the wall.
  • Mark the longest point of your foot—usually the tip of your longest toe.
  • Measure the distance from the edge of the paper to your mark in centimeters.
  • Repeat for the other foot, as most people have one foot slightly larger.

If your measurement is around 23.5 to 24.5 centimeters, a size 37 is likely your sweet spot. If it’s closer to 24.5 to 25 centimeters, you might need a 38. Remember, you should always size up if you’re between sizes, especially for shoes that don’t stretch, like leather or synthetic materials.

Brand-Specific Fit for Size 37

Not all size 37 shoes are created equal. Here’s a quick breakdown of how different brands and styles tend to fit:

  • European luxury brands (e.g., Prada, Chanel, Jimmy Choo): These often run narrow and true to size. A size 37 here is typically a US 6.5. If you have wide feet, consider going up half a size.
  • Fast-fashion and mid-range brands (e.g., Zara, H&M, ASOS): These can be inconsistent. A size 37 in Zara might fit like a US 7, but in H&M, it could be tighter. Always check customer reviews for fit notes.
  • Sneaker brands (e.g., Nike, Adidas, New Balance): Athletic shoes often use a different sizing system. A women’s size 37 in Nike is usually a US 6.5, but for running shoes, you might want to go half a size up for comfort.
  • Sandals and open-toe styles: Since your toes aren’t confined, a size 37 can be more forgiving. But if the shoe has a back strap, make sure it doesn’t slip off your heel.
  • Heels and pumps: These should fit snugly but not painfully. If a size 37 feels too tight in the toe box, try a 38 with an insole or heel grip.

Practical Tips for Buying Size 37 Shoes Online

Now that you know the basics, let’s talk strategy. Shopping for size 37 shoes online doesn’t have to be a gamble. Follow these tips to increase your odds of a perfect fit:

  • Read the brand’s size guide: Most reputable retailers provide a conversion chart. Look for the specific brand’s guide, not a generic one.
  • Check customer reviews for “fit” comments: Look for phrases like “runs small,” “true to size,” or “runs large.” If multiple people say a size 37 fits like a US 6, believe them.
  • Measure your foot in centimeters: This is the most universal measurement. Compare it to the brand’s last length if they provide it.
  • Consider the material: Leather and suede stretch over time, so a snug size 37 might become perfect. Synthetic materials don’t stretch, so you need a more accurate fit from the start.
  • Order two sizes if you’re unsure: Many online stores offer free returns. Order both a 37 and a 38 to try at home, then return the one that doesn’t work.
  • Use a foot measuring app: There are apps that use your phone’s camera to measure your foot length and width. They’re not perfect, but they can give you a ballpark figure.

Common Myths About Size 37

Let’s clear up a few misconceptions that often trip up shoppers:

  • Myth: Size 37 is the same in every EU country. True, but the conversion to US sizes varies. A French size 37 might be a US 6.5, while an Italian size 37 could be a US 7. Always check the brand’s origin.
  • Myth: You should always buy the same size in heels and flats. Not true. Heels often require a half-size smaller to prevent slipping, while flats might need a half-size larger for toe room.
  • Myth: If a size 37 fits in one brand, it fits in all. As we’ve discussed, lasts vary. Your foot doesn’t change, but the shoe’s shape does.
  • Myth: You can “break in” shoes that are too small. You can stretch them a little, but if your toes are crammed, pain will persist. Don’t rely on breaking in as a fix.

Final Recommendations for Size 37 Shoppers

If you’re consistently a size 37 in EU sizing, here’s your cheat sheet for international shopping:

  • US women’s: 6.5 to 7
  • UK women’s: 4.5 to 5
  • Japanese: 23 to 23.5
  • Mexican: 5.5
  • Australian: 6 to 6.5

When in doubt, always go with your foot’s length in centimeters. It’s the most reliable metric across all systems. And remember, a good shoe should feel comfortable from the moment you put it on. If a size 37 feels tight, don’t force it. Your feet deserve better than a pair of shoes that make you wince every time you stand up. Happy shopping, and may your next size 37 fit like it was made for you.