How To · Fashion · Build
Measure your feet properly for online shoe shopping
Online shoe shopping doesn't have to be a guessing game. A few minutes with a ruler and the right technique will eliminate most sizing mishaps before checkout.
5 min read · IrisThe most common online shoe return? Wrong size. Not because sizing charts are useless, but because most people measure their feet wrong—or don't measure them at all. You're estimating based on what you wore in 2019, which is a recipe for disappointment.
The fix is simpler than you'd think. You need a ruler, a wall, and ten minutes of your time. This method accounts for the fact that your feet swell throughout the day, that different shoe styles fit differently, and that you're probably not the same size you think you are.
Measure your feet at the end of the day when they're slightly swollen—that's when you'll actually wear the shoes.
What you'll need.
- 01Ruler (12 inches minimum)
- 02Pencil or pen
- 03Flat wall and hard floor
- 04Paper for notes
- 05Phone for screenshots and reviews
Step one · 2 minutes
Gather your tools
You need a ruler (12 inches minimum), a pencil or pen, a flat wall, and a hard floor—no carpet. If you don't have a ruler, print a ruler template online or use a measuring tape held straight against the wall. Make sure your measuring tool is accurate by checking it against a known measurement first.
Digital calipers or a cloth measuring tape can work, but a standard ruler gives the clearest reading.
Step two · 1 minute
Measure at the right time of day
Feet swell as the day progresses—by evening they're roughly half a size larger than in the morning. Measure in the late afternoon or evening, ideally after you've been standing or walking. This ensures your shoe size accommodates your foot at its actual, lived-in size, not its theoretical morning state.
If you're between sizes after measuring, always round up.
Step three · 2 minutes
Position your foot correctly
Stand barefoot against the wall with your heel touching the baseboard. Your weight should be distributed evenly on both feet—this is the position your foot takes when you're actually wearing shoes. Keep your foot flat and parallel to the wall. Have someone mark the wall at your longest toe with a pencil, or use a small piece of tape to mark the spot.
Your longest toe might not be your big toe. Check both before marking.
Step four · 2 minutes
Measure heel to toe
Place your ruler on the floor with the zero mark at your heel. Measure straight up to the mark you made at your longest toe. Write down this number in inches and millimeters if possible—some brands use metric sizing. Repeat this process for both feet; they're rarely identical, and you should size to the larger foot.
Measure twice. Seriously. A quarter-inch difference can mean the difference between a comfortable fit and a return.
Step five · 2 minutes
Convert to shoe size using the brand's chart
Every brand sizes differently. Don't assume your Nike size matches your Adidas size or your dress shoe size. Go directly to the brand's website and find their size chart—most have a conversion tool that takes your foot measurement in inches or centimeters and gives you the corresponding size. Screenshot or bookmark the chart for future reference.
Check the brand's size chart before adding to cart, not after. Some charts are hidden in the fine print.
Step six · 1 minute
Account for socks and shoe style
If you're buying athletic shoes, measure while wearing the socks you'll actually wear with them. For dress shoes or sandals, measure barefoot. Consider the shoe's construction too—stretchy knits fit differently than rigid leather. Read reviews mentioning fit before ordering, and don't hesitate to order multiple sizes if the reviews suggest the shoe runs small or large.
Screenshot your foot measurement and keep it in your phone. You'll reference it constantly.
How to know it works.
You'll know your measurement is accurate when shoes arrive and fit without pinching at the heel, rubbing at the toe, or leaving dead space. Your toes should have roughly a thumb's width of room from the end of the shoe. If shoes still don't fit, your measurement was correct—the shoe simply doesn't work for your foot shape, which is valuable information for the next order.
Questions at the mirror.
My feet are two different sizes. Which one do I use?
Size to your larger foot. It's better to have slightly loose shoes on one foot than cramped shoes on the other. Many brands offer half-sizes specifically for this reason.
I measured in the morning and ordered, but the shoes feel tight now. What happened?
Your feet swelled after you measured. This is why evening measurement matters. For future orders, measure in the afternoon or evening, or add a half-size to morning measurements.
The brand's size chart doesn't match my foot measurement. Which do I trust?
Trust your measurement, then cross-reference with customer reviews. If multiple reviewers say the shoe runs small, go up a size. The chart is a starting point, not gospel.
Do I need to measure every time I order?
Not if you're ordering from the same brand. But if you're trying a new brand or style, measure again. Sizing varies wildly between categories—athletic shoes, dress shoes, and sandals rarely align.