How to Measure Your Feet at Home (and Actually Use the Numbers)

Buying the wrong size is the most expensive mistake in budget shoe shopping. A shoe that pinches or slips gets worn twice and then sits in the closet, which makes even a heavily discounted pair a waste of money. The good news is that you can measure your feet accurately at home in about ten minutes with things you already own.

What you need

• Two sheets of plain paper, larger than your foot
• A pencil or pen held upright
• A ruler or tape measure with millimeters or sixteenths of an inch
• A hard floor (not carpet)
• The socks you normally wear with the type of shoe you are buying

Socks matter more than people expect. A thick hiking sock can add several millimeters of volume compared with a thin running sock, which is enough to change how a shoe fits.

When to measure

Measure in the late afternoon or evening. Feet swell slightly over the course of a day, especially if you have been on your feet, and a shoe that fits at 8 a.m. can feel tight by 6 p.m. Measuring later in the day gives you the size you will need when your feet are at their largest.

Step-by-step: measuring length

1. Tape the paper to the floor against a wall, with the short edge touching the wall.
2. Stand on the paper with your heel lightly touching the wall. Put your full weight on that foot; leaning or sitting compresses the foot differently.
3. Have someone else trace around your foot, keeping the pencil vertical. If you are alone, trace carefully and accept that you may need to repeat it.
4. Mark the tip of your longest toe. For many people this is the big toe, but for a significant number it is the second toe.
5. Measure from the wall edge of the paper to that mark in a straight line. That is your foot length.
6. Repeat for the other foot. It is common for feet to differ by a few millimeters. Always buy for the larger foot.

Step-by-step: measuring width

Measure across the widest part of your traced foot, which is usually the ball of the foot just behind the toes. Width is where many budget buyers go wrong, because most shoes are sold in a single standard width and many people never think to check.

Width alone does not give you a size, but it tells you whether you should be filtering for wide or narrow options. If your width seems large relative to your length, read our guide to buying shoes for wide feet.

Turning millimeters into a shoe size

Do not rely on a generic size chart you found somewhere. Shoe sizes are not standardized between brands, and even within one brand a running shoe and a casual shoe can fit differently. Instead:

1. Find the size chart published by the specific brand you are buying, ideally for the specific category (running, casual, boots).
2. Look for the chart that lists foot length in centimeters or inches, not just "US / UK / EU" conversions.
3. Match your measured foot length to the chart. If you fall between sizes, most brands suggest going up, not down.

Many brands list foot length, but some list the length of the inside of the shoe (the "last"). If a chart shows numbers that seem much bigger than your foot, it is probably listing shoe length rather than foot length. Read the chart's notes.

How much space you should have

A shoe should be longer than your foot. A widely used guideline is roughly a thumb's width (around 1 cm, or a bit under half an inch) between your longest toe and the end of the shoe when standing. Running and hiking shoes often need a little more room, because feet slide forward and swell during long efforts and on downhills.

Too little space leads to bruised toenails. Too much space lets your foot slide around, which causes rubbing and blisters.

Common mistakes to avoid

Buying your "usual size" by habit. Feet can change over time, particularly after pregnancy, significant weight change, or simply aging. If you have not measured in a few years, measure again.

Measuring sitting down. Your foot spreads when it bears weight. Always measure standing.

Ignoring the second foot. If your feet differ, the larger foot sets your size.

Assuming men's and women's sizes are interchangeable one-to-one. In US sizing, a women's size is usually about 1.5 sizes larger in number than the equivalent men's size, so a men's 8 is roughly a women's 9.5. Check the brand's own conversion; it varies.

Trusting a single review that says "runs small." One reviewer's feet may be unusually wide or high-volume. Look for a pattern across many reviews before changing size, and see our guide to why shoe sizes differ between brands.

Using your measurement when shopping online

Write your numbers down somewhere you will find them again: length and width for each foot, in millimeters, and the date. When you shop:

• Check the brand's size chart against your length every time, even for a brand you have bought before.
• If you already own a pair that fits well, note its brand, model and size. Same brand, similar model is the safest repeat purchase.
• Check the return policy before buying. A free return turns a sizing gamble into a low-risk trial. Our online returns checklist covers what to look for.

When a home measurement is not enough

A home measurement is excellent for length and reasonable for width, but it cannot tell you about arch height or foot volume (how "tall" your foot is). If you consistently find that shoes press on the top of your foot, or that your heel slips even when the length is right, it may be worth getting fitted once in a specialist running or shoe store. Note what fits, then use that knowledge to buy the same model online for less when it goes on sale.

If you have persistent foot pain, numbness, or a foot shape that makes most shoes uncomfortable, that is a reason to see a podiatrist rather than keep experimenting with sizes.

The short version

Measure in the evening, standing, in your usual socks. Trace both feet and use the larger one. Compare your length to the specific brand's chart, leave about a thumb's width of room, and buy from a seller with easy returns. Ten minutes of measuring will save you far more than any coupon code.