How To · Fashion · Footwear
Find Your True Shoe Size Across Every Brand
Shoe sizing is a maze—and brands make it worse. Here's how to measure your feet properly, understand what your size actually means, and decode the variations that make shopping across labels feel like learning a new system every time.
5 min read · IrisYou've probably bought shoes in three different sizes from three different brands. That's not a personal failing—it's how the industry actually works. Vanity sizing, manufacturing inconsistencies, and regional standards mean your 'true' size is less a fixed number and more a starting point for investigation.
The good news: with proper measurement technique and a system for tracking brand behavior, you can stop the guessing game. This guide walks you through measuring your feet accurately, understanding what those measurements mean, and building a personal size reference that works across labels.
Your shoe size isn't universal—but your foot measurements are.
What you'll need.
- 01Ruler or soft measuring tape
- 02Standard shoe sizing chart
- 03Paper and pencil for tracing
- 04Spreadsheet or notes app for brand reference
- 05The shoes you're testing
Step one · 2 minutes
Measure your feet at the end of the day
Feet swell throughout the day and are largest in the evening—the ideal time to measure. Wear the socks or hosiery you plan to wear with your shoes. Stand on a hard floor with your weight distributed evenly on both feet. Use a ruler or measuring tape to measure from your heel to the tip of your longest toe (usually the big toe, but sometimes the second toe). Measure both feet; they're rarely identical.
Measure three times and use the largest measurement. Feet expand slightly with age and activity, so remeasure annually.
Step two · 1 minute
Convert your measurement to standard sizing
Once you have your foot length in centimeters or inches, use a standard sizing chart to find your US women's size. A foot measuring 9.25 inches typically converts to a US size 7, though this varies slightly by chart. Write down both your actual measurement and the corresponding size. This measurement is your anchor—it doesn't change, even when brands do.
Bookmark a reliable sizing chart (Brannock Device standards are most consistent). Screenshot it so you have it while shopping online.
Step three · 2 minutes
Assess your width and arch profile
Shoe size is only half the story. Width matters enormously and varies by brand. Stand on a piece of paper and trace the outline of your foot. Measure the widest part of your foot across the ball (the widest point). Compare this to standard width charts—most brands offer narrow, standard, wide, and extra-wide. Also note your arch height: high arches need different support than flat feet. This profile is as important as your length measurement.
Width sizing isn't standardized either. If you're between sizes, brands like New Balance and Clarks offer multiple widths; others don't. Knowing your width helps you choose brands that actually accommodate your feet.
Step four · 2 minutes
Build a personal brand fit reference
Create a simple spreadsheet or note with three columns: Brand, Size, and Notes. As you buy shoes, record the brand, the size you purchased, and how it actually fit (tight, perfect, loose, narrow, roomy). After three to five purchases per brand, you'll see the pattern. Some brands run small; others are generous. Some are narrow; others are wide. This becomes your personal sizing decoder that's worth far more than any generic chart.
Include shoe style in your notes—a brand's heels might fit differently than their flats. A pointed toe runs tighter than a round toe from the same maker.
Step five · 2 minutes
Test fit using the half-inch rule
When trying on shoes, there should be approximately half an inch (about the width of your thumb) between your longest toe and the end of the shoe. Your heel should not slip; your foot should not slide forward when you walk. The shoe should feel snug around the midfoot and arch but not pinching. If the shoe requires a 'break-in period' for basic comfort, it's probably not right—quality shoes should feel good immediately (though they may soften slightly with wear).
Walk around for at least two minutes in any shoe before deciding. The first thirty seconds don't tell you much; discomfort often emerges after that.
Step six · 1 minute
Know when to size up or down
If your measurement converts to a size 7 but a brand runs small, you might need a 7.5 or 8. If a brand runs large, you might go down to a 6.5. The key: your actual foot measurement stays constant. You're adjusting the size number to match the brand's fit, not second-guessing your feet. Once you understand a brand's pattern, sizing becomes predictable.
Online return policies are your friend while you're building your reference. Buy your measured size first; if it doesn't fit, use your notes to adjust for the next purchase.
How to know it works.
You've nailed your fit when you can walk into a shoe store or open an online retailer and confidently select a size based on the brand, knowing it will fit without trying it on. Your feet feel supported without pain, your heel doesn't slip, and you have room for your toes without excess space. Most importantly, you stop buying shoes in three different sizes.
Questions at the mirror.
My feet are different sizes. Which one do I size for?
Size for your larger foot. Wear thicker socks or use a thin insole in the shoe on your smaller foot if needed. Buying for your smaller foot will leave your larger foot cramped and uncomfortable.
I'm between sizes. Should I always go up?
Not necessarily. It depends on the shoe style and brand. Pointed toes and heels often fit tighter than round-toe flats from the same maker. Check your brand reference notes. If you have no data, go up for styles that tend to run small (heels, pointed toes) and stick with your size for roomier styles.
What if a brand doesn't come in my size?
Some brands have narrow size ranges. If you consistently find yourself between their sizes with no half-size option, that brand may not be worth your time. There are plenty of makers who offer extended sizing. Your comfort matters more than a specific label.
Do I need to remeasure my feet?
Yes, annually or if your fit suddenly changes. Feet can shift with age, weight changes, and pregnancy. What fit perfectly five years ago might not work now. A quick remeasure takes two minutes and keeps your reference accurate.