How To · Fashion · Accessories
Find your true shoe size before you buy online
Online shoe shopping doesn't have to be a guessing game of returns and frustration. A few strategic steps—measuring at home, understanding brand behavior, and decoding review language—will get you the right fit on the first try.
5 min read · IrisThe online shoe return rate exists for a reason: sizing is inconsistent, brands lie about their specs, and what fits in a store doesn't always translate to what arrives at your door. But this isn't a reason to give up on online shopping—it's a reason to get strategic.
The key is doing your homework before you click buy. This means measuring your actual feet, understanding how specific brands fit, and learning to decode the hidden language in customer reviews. Once you have this information, you'll shop with confidence.
Measure in the afternoon when your feet are naturally swollen—this is when you'll actually wear the shoes.
What you'll need.
- 01Ruler or measuring tape
- 02Paper and pencil
- 03Socks you'll actually wear
- 04Brand-specific size chart
- 05Access to product reviews
Step one · 2 minutes
Measure both feet properly
Grab a ruler, a piece of paper, and wear the socks you'll actually wear with the shoes you're buying. Stand on the paper with your full weight distributed evenly—this matters because your foot expands slightly under pressure. Mark where your heel ends and where your longest toe ends. Measure the distance in both inches and centimeters. Do this in the afternoon or evening when feet are naturally slightly swollen from the day; this is when you'll actually wear most shoes.
Measure both feet. Most people have one foot slightly larger than the other, and you should size to the bigger foot.
Step two · 1 minute
Convert your measurement to standard sizes
Use a shoe size chart specific to the country where you're shopping. A US women's size 8 is not the same as a UK 8 or a European 38. Most reputable retailers have size conversion charts on their websites. Write down your size in the relevant system. Bookmark a reliable conversion chart (like Zappos or the brand's own sizing guide) for future reference.
Screenshot the brand's specific size chart, not a generic one—brands often have their own quirks baked into their sizing.
Step three · 2 minutes
Research the specific brand's fit reputation
Before you buy, search the brand name plus 'sizing' or 'fit' on Reddit, TikTok, or dedicated fashion forums. Look for patterns: Do people consistently say this brand runs small? Wide? Narrow? Check the brand's own FAQ or fit guide—some brands like Clarks or Birkenstock have well-documented sizing tendencies. If a brand is known for running narrow and you have wide feet, you now know to size up or skip it entirely.
Pay attention to comments from people with similar foot shapes or concerns to yours—a comment about narrow toe boxes matters more if you also have narrow feet.
Step four · 2 minutes
Read reviews like a detective
Don't just scan star ratings. Read the one- and two-star reviews first—these tell you what actually went wrong. Look for specific language: 'runs small' is different from 'tight in the toe box.' Phrases like 'I'm usually a size X and these felt like a size Y' are gold. Count how many people mention the same issue. If five reviewers say the heel is loose, that's a pattern worth noting. Also check if the reviewer mentions their foot width or any special considerations.
Filter reviews by 'most helpful' rather than 'most recent'—the community has already done some vetting for you.
Step five · 2 minutes
Check the return policy before you buy
Even with all this research, sometimes shoes just don't work. Know the retailer's return window and whether returns are free. Some sites like Zappos offer free returns for a full year; others give you 30 days. Some charge for return shipping. Factor this into your decision—if a shoe is risky and returns are expensive, you might want to try it in a physical store first or skip it.
Screenshot the return policy. Retailers change them, and you want proof of what you agreed to.
Step six · 1 minute
Order with confidence (and maybe a backup size)
If you're still uncertain after all this research, order two sizes and return the one that doesn't fit. Yes, this means more shipping, but it's cheaper than guessing wrong repeatedly. If you're confident in your research, order your size and trust the process. Either way, you're now making an informed decision instead of a blind one.
If ordering two sizes, note which is which before they arrive so you don't mix them up.
How to know it works.
The right shoe size means your heel doesn't slip when you walk, your toes have about a thumb's width of space at the end, and the shoe feels snug but not painful across the widest part of your foot. You should be able to wiggle your toes slightly. If you're returning shoes, that's not failure—that's the system working as intended.
Questions at the mirror.
What if I'm between sizes?
Size up. A slightly loose shoe can be fixed with insoles or thicker socks; a cramped shoe cannot be fixed and will cause blisters and pain. Always choose comfort over a 'perfect' size.
Do I need to account for shoe stretching?
Some materials stretch slightly (leather, suede), while others don't (synthetics, canvas). Check reviews for this specific brand. If it stretches, you might size down slightly. If it doesn't, size to fit immediately.
Why do my shoes fit differently depending on the brand?
Different manufacturers use different lasts (the wooden form shoes are built around). A size 8 in one brand might be built on a narrower or wider last than another brand's size 8. This is why brand-specific research matters.
Should I size differently for different shoe types?
Yes. Sneakers often fit differently than heels or flats. Boots sometimes need a half-size larger to accommodate socks. Always check reviews specific to the shoe style, not just the brand.