You’ve probably been there before: scrolling through a sleek online shoe store, your heart set on a gorgeous pair of heels or sneakers. You click on your size, only to find a number that looks completely foreign — like 37. Suddenly, a wave of confusion hits. Is that a six? A seven? Will it fit like a glove or squeeze your toes into submission?

This moment of uncertainty is more common than you’d think, especially with the rise of global fashion brands. While the US uses a numbered scale that seems to start around five and go up to twelve, much of the rest of the world — Europe in particular — uses a completely different system. And right in the middle of that system, you’ll find the elusive size 37. So, let’s clear up the mystery once and for all.

What Exactly Is a Women’s Shoe Size 37?

In the simplest terms, a women’s shoe size 37 is the standard European size that roughly corresponds to a US women’s size 6.5 to 7. But here’s the kicker: it’s not an exact science. Because shoe sizing is based on the actual length of your foot in centimeters (or millimeters), a size 37 is designed for a foot that measures approximately 23.5 to 24 centimeters (or 9.25 to 9.45 inches) from heel to toe.

Think of it this way: the US system feels a bit arbitrary, based on barleycorns and historical quirks. The European system, on the other hand, is more directly tied to physical measurements. A size 37 in Europe is a direct translation of that specific foot length, making it a very common “average” size for women around the world.

This is why you’ll often see size 37 referred to as the “Goldilocks” size. It’s not too small, not too big — it’s the sweet spot for many women. But here’s where it gets tricky: different brands use different lasts (the mold the shoe is built on). A size 37 in a luxury Italian pump might feel slightly narrower than a size 37 in a chunky German sneaker. The length is consistent, but the width and volume can vary wildly.

Why Does Size 37 Cause So Much Confusion?

The confusion usually boils down to three main reasons: conversion inconsistencies, brand-specific quirks, and the dreaded “half-size” problem.

  • Conversion Chaos: Most conversion charts will tell you that size 37 equals a US 6.5. But some charts say it’s a US 7. This happens because different countries (even within Europe) have subtle variations. A French 37 might be slightly smaller than an Italian 37. When a brand says “European sizing,” they might be using the French standard, the Italian standard, or just a generic average. Always check the brand’s specific size chart, not a generic one.
  • The Half-Size Gap: Many European brands don’t make half sizes. A size 37 is often the only option between a 36 and a 38. If your US size is a 6.5, you’re in luck — 37 is usually perfect. But if you’re a true US 6 or a true US 7, you might find yourself in a tricky spot. A 36 might be too tight, and a 37 might feel slightly loose. This is where the specific shoe style matters a lot.
  • Width Matters: The European system is primarily a length-based system. It doesn’t always account for width (narrow, medium, wide) in the same way the US system does. A size 37 in a narrow-cut heel might feel like a torture device if you have a wider foot, even if the length is perfect. Conversely, a size 37 in a wide sneaker might feel like a boat if you have a narrow foot.

How to Know If Size 37 Is Right for You

Forget the number on the box for a moment. The real question is: what is the length of your foot in centimeters? This is the only reliable way to navigate the size 37 puzzle. Here’s a simple, at-home method to find your true size.

  • Step 1: Gather Your Tools. You’ll need a piece of paper, a pen, a ruler, and a wall. Wear the type of socks you’d normally wear with the shoes you’re buying (thin for heels, thick for boots).
  • Step 2: Trace Your Foot. Place the paper against the wall. Stand on the paper with your heel touching the wall. Mark the longest point of your foot (usually the tip of your big toe or second toe). Do this for both feet — most people have one foot slightly larger than the other.
  • Step 3: Measure the Length. Use the ruler to measure the distance from the edge of the paper (where the wall was) to your mark. That’s your foot length in centimeters.
  • Step 4: Compare to the Brand’s Chart. Now, look at the specific brand’s size chart. If your foot measures 23.5 cm, you are a textbook size 37. If you measure 23.8 cm, you are still likely a 37, but you might prefer a 38 in a closed-toe pump. If you measure 24.2 cm, you are probably a 38.

This method takes the guesswork out. You are not a “size 37” in the abstract. You are a “23.5 cm foot.” The shoe size is just a label.

Practical Tips for Buying Size 37 Shoes

Now that you understand the science, let’s talk about the art of buying. Whether you’re shopping online or in a store, here are some actionable tips to ensure you don’t end up with a blister-inducing mistake.

  • Always Read Reviews for “Fit Notes.” Before you click “add to cart,” scroll down to the customer reviews. Look for phrases like “runs small,” “runs large,” or “fits true to size.” If several reviewers with your foot length say the 37 is too tight, size up to a 38. If they say it’s loose, stick with the 37 or even try a 36.
  • Know Your Shoe Type. Open-toe sandals are more forgiving. If your foot is 24 cm, a size 37 in a slide sandal might work perfectly because your toes can hang out a bit. But a closed-toe pump or a pointed-toe flat needs to be precise. For pointed shoes, many women with a 23.5 cm foot actually prefer a size 38 to avoid toe cramping.
  • Consider the Material. Leather stretches. Canvas does not. If you’re buying a leather pump in size 37 and it feels snug, it will likely mold to your foot after a few wears. If you’re buying a synthetic or canvas sneaker, that snugness will likely stay snug forever. In that case, you might want to size up to a 38.
  • Don’t Forget the Insole Trick. If you find a gorgeous pair of boots in size 37, but they feel just a tiny bit loose, don’t despair. A simple cushioned insole or a thicker sock can fill that extra millimeter of space, turning a “maybe” fit into a perfect one. This is a lifesaver for the “in-between” foot.
  • Shop at Stores with Good Return Policies. This is the golden rule of buying size 37 (or any European size). Because the fit can vary so much between brands, you need the freedom to order two sizes and return the one that doesn’t work. Zappos, Nordstrom, and many European retailers offer free returns for this exact reason.

A Quick Reference Guide for Size 37

To make your life easier, here’s a quick cheat sheet. Keep in mind these are general approximations. Your specific brand may vary.

  • US Women’s: 6.5 (sometimes 7, depending on the brand)
  • UK Women’s: 4.5 (sometimes 5)
  • Foot Length: 23.5 cm (9.25 inches) to 24 cm (9.45 inches)
  • Common Brands Using Size 37: Zara, Mango, H&M, Adidas (women’s), Nike (women’s), Clarks, Dr. Martens, most European luxury houses (Gucci, Prada, etc.)

Final Thoughts: Embrace the 37

Size 37 is not a mystery — it’s just a different language. Once you learn to speak in centimeters and understand that brand-specific quirks are the norm, not the exception, you’ll find that shopping for shoes becomes a lot less stressful and a lot more fun. It opens up a world of incredible European brands and styles that you might have previously avoided out of confusion.

So, next time you see that 37, don’t hesitate. Measure your foot, check the brand’s chart, and trust your knowledge. You’ve got this. Happy shoe hunting.