How To · Fashion · Footwear
How to Measure Your Shoe Size Correctly
Your shoe size isn't a fixed number—it changes with time, swelling, and brand variance. Here's how to measure yourself accurately so you stop buying shoes that pinch or slip.
5 min read · IrisMost of us have never actually measured our feet. We inherit a size from one brand, assume it travels everywhere, and wonder why our heels slip or our toes cramp. The truth: your foot size shifts slightly year to year, swells throughout the day, and varies wildly between manufacturers. A European 38 is not a universal 38.
Measuring your feet takes ten minutes and eliminates the guesswork. You'll know your length, width, and arch position—the three variables that determine whether a shoe works. Do this on a weekday afternoon when your feet are at their most swollen, and you'll have a baseline that accounts for real-world wear.
Measure in the afternoon when your feet are slightly swollen—this is when you'll actually wear your shoes.
What you'll need.
- 01Ruler or measuring tape
- 02Pencil
- 03White paper
- 04Hard, flat surface (tile or wood floor)
- 05Shoe sizing chart
Step one · 2 minutes
Gather your materials
You need a ruler or measuring tape, a pencil, a sheet of white paper, and a hard, flat surface like a tile floor or wooden table. Avoid carpet—it compresses and throws off your measurement. If you have a Brannock device (the metal foot-measuring tool at shoe stores), even better, but this method works without one.
Use a ruler marked in both inches and centimeters so you can reference sizing in any region.
Step two · 1 minute
Position your foot correctly
Place the paper on your hard surface and stand on it with your full body weight distributed evenly on both feet—don't lean. Wear the socks you typically wear with shoes, or go barefoot if you prefer minimal shoes. Have someone else trace your foot, or trace it yourself by holding the pencil perpendicular to the paper and marking around your heel and toe.
Stand normally, not on your tiptoes. Your foot naturally spreads slightly under weight, and that's the measurement you need.
Step three · 2 minutes
Measure length from heel to longest toe
Using your ruler, measure the distance from the very back of your heel outline to the tip of your longest toe. This is your foot length. Write it down in both inches and centimeters. Measure twice to confirm. Your longest toe might not be your big toe—many people have a longer second toe, and that's what counts for shoe sizing.
If your two feet measure differently, use the larger measurement when buying shoes. Your feet are rarely identical.
Step four · 2 minutes
Measure width at the widest point
Measure across the widest part of your foot outline, usually around the ball of your foot where your toes begin. This tells you whether you're narrow, standard, or wide. Write this number down. Width matters as much as length—a narrow size 8 is completely different from a wide size 8, and ignoring this is why shoes slip or squeeze.
Some brands offer half-width sizing (like 8.5B for narrow). Knowing your width helps you filter options before you even try them on.
Step five · 2 minutes
Convert to shoe sizes using a chart
Use your measurements against a standard shoe sizing chart (available free online for US, UK, EU, and other regions). Most charts cross-reference foot length in centimeters or inches with corresponding shoe sizes. Remember that sizing charts are guidelines—brands have their own lasts (the wooden forms shoes are built around), so a size 8 in one brand might feel like a 7.5 or 8.5 in another.
Screenshot or bookmark a sizing chart from a major retailer. Different brands sometimes use slightly different conversions.
Step six · 1 minute
Test your measurement in-store or online
Order or try on shoes in your measured size and note how they feel. If they're too tight or loose, adjust your next purchase based on that feedback. Keep your measurements and width notes in your phone so you can reference them when shopping online or in unfamiliar brands.
Always check a brand's specific size guide before ordering—luxury and independent brands often run small or large compared to standard sizing.
How to know your measurement is accurate.
Your measurement is reliable when shoes fit snugly at the heel with about a thumb's width of space at the toe, and the ball of your foot sits comfortably in the widest part of the shoe. You should feel no pinching across the top or slipping at the heel.
Questions at the mirror.
My feet measure different sizes. Which one do I use?
Always size to your larger foot. It's better to have slightly loose shoes on one foot than cramped shoes on the other. Many people have asymmetrical feet—this is normal.
My measurement doesn't match any standard size. What do I do?
You likely fall between sizes. Try both and see which feels better, or look for brands that offer half-sizes. Some luxury and athletic brands are more precise about incremental sizing.
Should I measure my feet every year?
Yes, especially if you've gained or lost significant weight, are pregnant, or haven't bought shoes in several years. Feet can change with age and life circumstances.
Does shoe size change throughout the day?
Yes. Feet swell slightly as the day progresses and you move around. Measure in the afternoon for a realistic baseline, and buy shoes that fit your swollen feet—they'll feel fine in the morning.