How To · Fashion · Shoes
The Shoe Fit Guide: Finding Your True Size and Width
Your shoe size isn't fixed—it shifts with age, pregnancy, and even the time of day. Here's how to measure yourself properly and decode width measurements so you actually know what to buy.
5 min read · IrisMost women wear the wrong shoe size. Not by half a size—by a full size or more. The culprit? We measure our feet once, at age 16, and never revisit it. Feet change. They swell during the day, expand during pregnancy, and flatten slightly as we age. Your current size might be wrong, and that's not a personal failure—it's just biology.
Width matters as much as length, yet most of us ignore it entirely. A shoe can be the right length but pinch across the ball of your foot or gap at the heel. This guide walks you through measuring both dimensions accurately, understanding width codes across different brands, and knowing exactly what to look for when you shop. No more returns. No more blisters.
Your feet change throughout your life. Measure them every two years, and always in the afternoon when they're slightly swollen.
What you'll need.
- 01Ruler or measuring tape
- 02Pencil
- 03Paper for notes
- 04Socks you normally wear
- 05Shoe size chart (online or from retailer)
- 06Hard, flat surface
Step one · 2 minutes
Measure in the afternoon
Schedule your measurement for late afternoon or early evening—your feet swell naturally as the day progresses and you move around. This is when they're closest to their actual size during normal wear. Avoid measuring first thing in the morning or after sitting for long periods. Wear the socks or hosiery you typically pair with shoes, as thickness affects fit. Stand barefoot on a hard, flat surface (not carpet, which compresses and skews measurements).
If you're pregnant or recently postpartum, measure again. Feet often permanently increase by half a size or more due to ligament relaxation.
Step two · 2 minutes
Measure length from heel to longest toe
Place a ruler or measuring tape on the floor against a wall. Stand with your heel touching the wall and your weight distributed evenly on both feet. Mark where your longest toe ends (usually your big toe, but sometimes your second toe). Measure the distance from the wall to that mark in both inches and centimeters. Write down both feet—they're rarely identical. Use the longer measurement as your baseline. Add a quarter-inch buffer for comfort; this accounts for natural foot swelling during wear.
Have someone else mark your toe point if possible. It's easier to stay still while someone else holds the pencil.
Step three · 2 minutes
Measure width at the widest point
Measure across the ball of your foot (the widest part, usually where your toes meet your sole). Stand with your weight evenly distributed. Measure from the outside edge of your foot to the opposite outside edge. Do this for both feet. Write down both measurements. Width is often overlooked but it's critical—a narrow shoe in the right length will still hurt, and a wide shoe that's too long causes blisters and instability.
Some people have asymmetrical feet. If one foot is significantly wider, prioritize fit for that foot when shopping.
Step four · 1 minute
Convert measurements to shoe size
Use a standard shoe size chart (available free online from brands like Zappos or DSW). Find your length measurement and cross-reference with your width measurement. Most charts use letter codes: B or N for narrow, C or M for medium, D or W for wide, E or WW for extra-wide. Different brands use different systems, so check each brand's specific chart rather than assuming consistency. Write down your true size in both US and European sizing—useful when shopping international brands.
Bookmark your brand's size chart. Brands like Clarks, Naturalizer, and New Balance publish detailed width guides that are genuinely helpful.
Step five · 2 minutes
Test fit in-store or order multiple sizes
When you shop, try on shoes in the afternoon (same time you measured). Wear the same socks you measured in. Walk around for at least two minutes—blisters and pressure points reveal themselves in motion, not standing still. There should be a thumb's width of space between your longest toe and the shoe's end. Your heel should not slip when you walk. The widest part of the shoe should align with the widest part of your foot. If a shoe doesn't feel right immediately, it won't improve with wear.
Online shopping? Order in two sizes and two widths. Return what doesn't work. This is faster than guessing.
Step six · As you shop
Know your brand's fit personality
Brands have distinct fit signatures. Italian shoes tend to run narrow; Scandinavian brands often run wide. Athletic brands size differently than dress shoes. After you've bought a few pairs, you'll develop intuition about which brands align with your feet. Keep notes on what works. If you love a brand's fit, you're more likely to find success with their other styles. This is why loyalty to a brand often matters more than chasing the lowest price.
Read reviews specifically for fit comments. 'Runs small' or 'wide in the toe box' from multiple reviewers is reliable data.
How to know it works.
Proper fit means no pain during the first wear, no blisters after an eight-hour day, and no heel slipping when you walk. Your toes should have breathing room but not slide around. The shoe should feel snug across the ball of your foot without pinching. You should forget you're wearing them within an hour.
Questions at the mirror.
My feet are two different sizes. Which one do I buy for?
Buy for your larger foot. Wear thicker socks or use a heel grip on the smaller foot if needed. It's easier to add padding than to return shoes that don't fit your bigger foot.
I've worn the same size for 20 years. Why would it change?
Feet flatten and widen with age due to ligament relaxation. Pregnancy permanently changes foot size in about 60% of women. Even without major life events, gravity and years of impact shift your arch. Remeasure every two years.
Width codes are different at every store. How do I know what to buy?
Always check the specific brand's size chart before ordering. Don't assume 'W' means the same thing at Nordstrom and at a specialty shoe store. When in doubt, order multiple widths and return what doesn't fit.
Can shoes stretch to fit?
Leather stretches slightly (about a quarter-inch), but synthetic materials don't. Even leather won't fix a shoe that's genuinely too small or too narrow. Buy the right size first; stretching is a last resort, not a solution.
Should I size up for winter boots?
Yes, but only a half size, and only if you're wearing thick socks or thermal liners. Measure your feet with those socks on. Oversizing more than a half size causes heel slip and blisters.