Buying sneakers across Nike, Jordan, New Balance, adidas, and independent streetwear brands can be confusing because a familiar number does not guarantee the same fit. This sneaker size conversion guide shows how to measure your feet, read US/UK/EU/CM charts, compare common brand tendencies, and make a safer choice when returns are limited or unavailable.
Overview
The most reliable starting point for sneaker sizing is foot length in centimeters, not a number copied from a pair you already own. US, UK, and EU sizes are useful for shopping, but their conversions are not perfectly standardized. The same labeled size may feel different because of a shoe’s last, upper materials, toe-box shape, cushioning, and intended fit.
Think of your result as a sizing range rather than a universal answer. Measure both feet, use the larger measurement, and compare it with the official chart for the exact model. This matters especially for limited streetwear drops and resale pairs, where exchanging the wrong size may be difficult. For additional guidance on tees, hoodies, pants, and sneakers, see our complete streetwear sizing guide.
Approximate adult sneaker conversion table
The table below is a general reference, not a substitute for a brand’s model-specific chart. EU sizing can vary by half-size increments and by manufacturer.
| US men/unisex | US women | UK | EU approximate | Foot length guide |
|---|---|---|---|---|
| 6 | 7.5 | 5 | 38.5–39 | 24 cm |
| 7 | 8.5 | 6 | 40 | 25 cm |
| 8 | 9.5 | 7 | 41 | 26 cm |
| 9 | 10.5 | 8 | 42.5 | 27 cm |
| 10 | 11.5 | 9 | 44 | 28 cm |
| 11 | 12.5 | 10 | 45 | 29 cm |
| 12 | 13.5 | 11 | 46 | 30 cm |
Women’s and men’s labels may describe different lasts or widths, so do not assume that adding a fixed number always produces an identical fit. When a brand lists CM or JP sizing, use that measurement as an important reference, then confirm whether it describes foot length or an insole measurement.
How to compare options
1. Measure your feet at the end of the day
Feet can expand during normal daily activity. Wear the type of socks you expect to use with the sneakers. Place a sheet of paper on a hard floor, stand naturally with your heel lightly against a wall, and mark the tip of the longest toe. Repeat for the other foot. Measure from the wall edge to each mark in centimeters and record the larger result.
Printable foot-measurement worksheet
Date: ____________________ Socks worn: ____________________
Left foot length: __________ cm Left foot width: __________ cm
Right foot length: _________ cm Right foot width: _________ cm
Larger foot: Left / Right Measurement used: __________ cm
Target model: ____________________ Official chart checked: Yes / No
Fit notes: narrow / standard / wide Toe-room preference: snug / moderate / roomy
2. Compare with the exact product chart
Search for the brand’s size guide on the product page or official help center. Check whether the chart is organized by foot length, heel-to-toe measurement, or a brand-specific size label. A running shoe, basketball shoe, skate shoe, and lifestyle sneaker may not share the same fit even within one brand.
3. Use a pair you own as evidence, not proof
Record the model, labeled size, width, socks worn, and how it feels after a full wear. This creates a useful personal reference. “I wear a 10” is less helpful than “this model in US 10 standard width gives me comfortable toe room with medium socks.”
4. Check the return terms before buying
Before ordering, confirm the seller’s current rules for exchanges, worn-once returns, sale items, international orders, and resale purchases. A size decision that is reasonable for a returnable pair may be too risky for a final-sale or authenticated resale purchase. Policies can change, so review the live listing rather than relying on an old screenshot.
Feature-by-feature breakdown
Nike and Jordan
Nike and Jordan models can differ noticeably in toe-box shape and overall volume. Many shoppers use their usual Nike or Jordan size as a starting point, but a narrow retro shape, padded collar, or structured upper can change the experience. Compare the model chart and look for whether the shoe is described as narrow, roomy, or true to size. Do not transfer the fit of a low-profile lifestyle model directly to a basketball or performance model.
New Balance
New Balance is often useful for shoppers who need more width choices because selected models and markets offer multiple width options. Width labels are not interchangeable with simply going up in length: sizing up may add unwanted toe length without solving pressure across the forefoot. If your toes feel compressed while the heel fits, investigate width options before changing length.
adidas
adidas fit can vary between silhouettes, knit or mesh uppers, and structured leather or synthetic constructions. Compare the brand’s current chart with the model’s product notes. If you are switching from another major brand, use your CM measurement as the bridge rather than assuming the same US number will feel identical.
Independent and streetwear brands
Independent labels may use factory-specific lasts, unisex charts, or limited size runs. Product pages sometimes describe measurements differently, so check whether the listed CM value refers to the foot, insole, or outsole. For smaller brands, contact customer support before a final-sale purchase and ask for an insole measurement when it is not published.
How sneakers should fit
Your heel should stay reasonably secure without painful pressure. Your toes should be able to move slightly, and the longest toe should not press against the front when you stand or walk downhill. The widest part of your foot should sit over the shoe’s widest area. Creasing, heel slip, and lace tension can offer clues, but they do not replace comfort. If you feel numbness, sharp pressure, or persistent rubbing, the size or shape is probably wrong.
Best fit by scenario
- Between two lengths: Start with the larger measurement and check the model’s fit notes. More room can be managed with socks or lacing; a shoe that is too short cannot be expanded safely.
- Wide feet: Look for explicit width options or a naturally roomier toe box. Avoid sizing up automatically if it leaves excessive heel movement.
- Narrow feet: Prioritize heel security and adjustable lacing. A thinner sock may help slightly, but it should not be used to compensate for a structurally oversized shoe.
- High instep: Choose uppers and lacing systems that allow adjustment. Pressure over the top of the foot is a shape issue as much as a length issue.
- Resale or no-return purchases: Match the seller’s measurements with your worksheet, ask for insole photos or measurements, and confirm the exact model and size code before paying.
- Streetwear outfits with thick socks: Measure while wearing similar socks. Styling advice for jeans, cargos, and wide-leg pants is available in our guide to how to style sneakers, but the outfit should never determine a painful fit.
When to revisit
Recheck this guide before buying a new model, switching brands, ordering from an independent label, or purchasing a resale pair without an easy return. Editors should refresh official size-chart links, model-specific fit notes, and return-policy details quarterly or whenever a major brand changes its sizing information. Readers should also revisit their own measurements after a significant change in footwear needs, preferred socks, or fit preference.
Before checkout, complete this five-minute routine:
- Measure both feet on a hard floor while wearing intended socks.
- Record the larger measurement in centimeters.
- Open the exact product’s official size chart.
- Compare width, toe-box, and model-specific fit notes.
- Read the current return or exchange terms and save the product details.
That process will not eliminate every sizing difference, but it turns a guess into a documented decision—especially important for limited streetwear drops, collectible sneakers, and purchases made from resale marketplaces.
