Find Your True Shoe Size: A Complete Fit Guide

The most common reason a pair of shoes gets returned is not style or quality. It is fit. And the most common reason for bad fit is that people are buying the size they have always bought rather than the size they currently are. Feet change. Here is how to know yours.

Measure at the end of the day

Your feet are at their largest in the evening after you have been on them. Measuring first thing in the morning will give you a number that is up to half a size too small. Measure at the end of a normal day, wearing the kind of hosiery or socks you would usually wear.

How to measure at home

Put a sheet of paper on a hard floor against a wall. Stand on it with your heel touching the wall, weight fully on that foot — this matters, because your foot lengthens when loaded. Mark the paper at the tip of your longest toe, which is not always the big toe. Measure from the edge that touched the wall to that mark, in centimetres.

Now do the other foot. Almost everyone has one foot slightly larger than the other. Always buy for the larger foot and adjust the other with an insole if needed.

Don't skip width

Length gets all the attention, but width causes more discomfort. Wrap a tape measure around the widest part of your foot, across the ball, and note that measurement. If your width measurement is proportionally large for your length, prioritise styles with a rounder or squarer toe box. A pointed toe on a wide foot will pinch no matter how correct the length is.

Your size legitimately changes between styles

This is not inconsistency, it is geometry. A pointed-toe stiletto needs more length than a round-toe flat because your toes sit further forward in the taper. A strappy sandal has nothing holding your foot back, so it often needs to be snugger. A platform sneaker with a padded collar may run smaller than the number suggests.

Expect to sit across roughly a full size depending on the style. Check the notes on the individual product page rather than assuming.

The four checks that tell you it fits

• Thumb's width at the front. About 1cm between your longest toe and the end of the shoe when standing.
• Heel stays put. A small amount of slip when walking is normal in heels and flats. Significant lift means it is too big.
• No pressure across the ball. If you can feel the sides of the shoe pressing inward when you stand, it is too narrow — length will not fix this.
• It feels right immediately. Leather softens and moulds. It does not lengthen. A shoe that is too short will never become long enough.

Test them properly

Try new shoes on a carpeted floor, standing and walking, not sitting down. Sitting removes the weight that spreads your foot to its true size. Walk at least a dozen steps. If anything rubs in that distance, it will be worse in an hour.

When you are between sizes

Go up for closed styles, especially anything pointed or anything you will wear for long stretches. Go down for open sandals and mules where a loose fit means slipping. You can add volume to a slightly large shoe with an insole; you cannot take space out of one that is too small.

Five minutes with a sheet of paper saves most of the guesswork. Measure once a year — feet genuinely do change over time, and after pregnancy or significant weight change they can change permanently.