That pair of trainers looked like a yes. The heels were made for the birthday plans. Then they arrived, pinched at the toes or slipped at the heel, and suddenly the whole outfit lost its sparkle. This shoe sizing guide is here to stop that happening. Getting your size right means more comfortable commutes, longer dance floors, easier city days and fewer shoes left looking cute at the back of the wardrobe.
Online sizing can feel slightly chaotic because a UK 5 is not always exactly the same fit from one style to the next. Your best size depends on foot length, width, shape and what the shoe is designed to do. A fitted strappy heel and a roomy pair of clogs should not be judged by the same rulebook.
Start With Your Feet, Not the Label
The number on your usual shoe box is a useful starting point, not a life sentence. Feet can change over time and can be slightly different lengths from each other. Pregnancy, activity levels, age and even a long day on your feet can affect how shoes feel. That is completely normal, and it is why a quick measurement is worth the two minutes.
Measure later in the day if you can. Feet naturally expand a little after walking, working, travelling or standing around waiting for your mates to be ready. Measuring when they are at their largest gives you a more realistic fit for everyday wear.
Wear the socks you would normally wear with the shoe. Thin socks for trainers? Measure in thin socks. Thick cosy socks for winter clogs? Use those instead. If you are shopping for heels or sandals, measure barefoot.
How to measure at home
Place a sheet of paper against a wall on a hard floor. Stand with your heel gently touching the wall, putting your weight through both feet. Mark the end of your longest toe, then measure from the paper edge to that mark in centimetres. Repeat on the other foot.
Use the longer measurement when checking a brand size chart. Do not be surprised if your longest toe is not your big toe - for plenty of people it is the second toe. That little detail is exactly why guessing by eye can lead to cramped shoes.
If you are between sizes, the style decides what happens next. Go up in closed, narrow or pointed styles, especially if you like a little room at the front. For open sandals with adjustable straps, your usual size may still work beautifully. The goal is secure and comfortable, never squeezed in for the sake of a number.
A Shoe Sizing Guide for UK Sizes
UK footwear sizing is usually based on length, but there is no single universal fit. One brand’s UK 6 can feel sleek and close, while another has extra room through the toe box or heel. Always check the individual product guidance where it is available, particularly for styles with a pointed toe, platform sole or structured upper.
As a rough reference, a UK women’s size 4 often suits a foot around 23cm, a size 5 around 24cm and a size 6 around 25cm. These are guides, not a promise written in pavement. Half sizes can also make a difference, although many fashion styles are sold in full sizes only.
When only whole sizes are available, sizing up is usually the safer call if your foot measurement sits between two numbers. An insole, heel grip or slightly thicker sock can fine-tune a shoe that is a touch roomy. There is much less you can do with a shoe that is too short. Your toes deserve better than being folded into an impossible position.
Width matters more than most people think
A shoe can be the right length and still feel wrong. If the sides of your feet feel compressed, your little toe is pushed inwards, or the material bulges uncomfortably across the widest part of the foot, you may need a wider-fitting style rather than a bigger size.
Look for round or square toe shapes, softer uppers, lace-up trainers and adjustable buckles if you prefer more room. Narrow feet can feel happier in styles with laces, ankle straps or secure fastenings, which help prevent sliding forward. A shoe that moves around too much can cause rubbing just as quickly as one that is too tight.
Fit Checks for Every Kind of Shoe
Different plans need different footwear. Your weekday trainers need support and a secure heel; your holiday sandals need straps that sit smoothly; your heels need balance as well as attitude. Check the fit with the shoe type in mind.
Trainers and active shoes
Trainers should have roughly a thumb’s width of space between your longest toe and the front of the shoe. This allows for natural movement and helps prevent toes hitting the end during a brisk walk, gym session or sprint for the bus.
Your heel should feel held in place without rubbing. Lace them properly before deciding they are too large, as loose lacing creates unnecessary slipping. If you wear orthotics or supportive insoles, try shoes with them in from the start - they take up space and can change the size you need.
Heels, boots and pointed toes
Heels should keep your foot steady rather than forcing your toes to grip for dear life. Walk on a clean indoor surface for a few minutes. If your foot slides forward, the straps dig in, or you feel wobbly before you have even left the bedroom, they are not the pair for an all-night plan.
Pointed-toe heels and boots often feel shorter because the front narrows. If the product fit runs small or you are between sizes, go up. With boots, think about the socks and tights you will wear. A boot that fits over bare feet may feel very different with chunky socks in November.
Sandals, sliders and clogs
For open footwear, your foot should sit inside the sole rather than hanging over the front or back. A tiny amount of visible sole around the edge is ideal. If your toes or heel reach the edge, size up.
Straps should be firm but not leave deep marks after a short try-on. Adjustable buckles are especially useful when feet swell in warm weather. For clogs and slides, avoid choosing a size that is so loose you have to curl your toes to keep the shoe on. Easy does not mean unstable.
Try Them On Like You Mean It
The first try-on tells you a lot. Put both shoes on, stand up and walk around indoors. Your feet are rarely identical, so one shoe is not enough evidence. Notice whether your heel lifts, whether your toes feel free, and whether any pressure point appears immediately.
A new shoe may soften slightly, particularly leather-look or fabric styles, but do not buy into the idea that painful shoes simply need to be “broken in”. Material can relax a little across the width. It will not magically create extra length, reshape a too-narrow toe box or turn a loose heel into a secure one.
Pay attention to friction. A small rub at home can become a full blister halfway through a shopping day. If a pair is nearly right, a heel grip or gel insole may help. If it is wrong in several places, send it back and choose a style that works with your feet, not against them.
Small Details That Change the Fit
Socks, insoles and foot shape are the obvious factors, but timing and styling matter too. A shoe worn for a quick photo is different from one worn for eight hours. Be honest about the plans you have for it.
For a festival, city break or day on your feet, prioritise cushioning, grip and toe room. For a dinner, a lower block heel or platform can give you the lift without the wobble. For gym-to-street outfits, choose trainers that feel secure enough to move in, then let the colour and shape bring the look together.
If you regularly get rubbing at the back of the heel, look for a softer collar or a more structured fastening. If your toes feel crowded, choose a rounder front. The most flattering shoe is the one that lets you walk into the room with confidence, not the one you are desperate to take off under the table.
London Look is all about pieces that keep pace with real life - the coffee run, the train platform, the rooftop plans and the last-minute holiday booking. Measure once, check the fit notes, and choose the pair that gives your feet room to move. Great style should turn heads, not turn your walk home into a mission.