Why should I measure my feet at home before buying trainers online?

We measure at home because buying trainers removes the fitting room, and a reliable home measurement of length, width and volume keeps returns low and comfort high - especially for running trainers, everyday sneakers or court-style shoes.

What tools and socks do we recommend for an accurate home measurement?

We suggest a large paper sheet (A3 or taped A4s), a ruler or tape measure with millimetre markings, a clear pen or pencil, the socks you usually wear with trainers, a flat hard floor and a chair to sit on.

How do we convert my foot measurement into the right brand size?

We measure heel-to-longest-toe in millimetres and check the brand’s size chart - prefer the brand’s internal (insole) length if given, and allow 5-10 mm extra for running or thick socks and 3-5 mm for snug technical fits.

What allowance should we choose for different activities (running, gym, casual)?

For running trainers add about 7-10 mm for toe splay and downhill running, for cross-training or gym shoes 5-8 mm is usually comfortable, and for casual sneakers 3-7 mm depending on how snug you want the fit.

How should we handle width or high-volume feet when shopping online?

If your forefoot width measures above average, we look for models offering 'wide' options or roomier uppers, prefer a slightly longer length rather than a too-small size, and use lacing adjustments or insoles to fine-tune fit.

Best size tips for online trainers: measure your foot at home with confidence

Learn how to measure your foot at home, convert millimetres to brand size charts and choose the right trainer size for running, gym or casual wear.

Published:July 11, 2026

Updated:September 2, 2026

5 min read

Photo by Stanislav Kondratiev on Pexels

Measure in millimetres

Record heel-to-toe length and forefoot width for the larger foot.

Why accurate foot measurement matters for online trainers

Buying trainers online removes the fitting room, so a reliable home measurement keeps returns low and comfort high. We focus on measuring foot length, width and volume at home, then matching those numbers to brand size charts and product details. This approach helps whether you shop running trainers, everyday sneakers or court-style shoes.

What you’ll need

Paper sheet large enough for your foot (A3 or taped A4s).
A ruler or tape measure with millimetre markings.
A pen or pencil that makes a clear outline.
The socks you normally wear with trainers (thin running sock or thicker gym sock).
Flat, hard floor and a chair to sit on.

Single measurement session: quick checklist

Sit, place paper on the floor, and put your foot flat with heel against a wall.
Trace the outline while keeping the pen vertical (don’t angle under the toe).
Measure heel-to-longest-toe in millimetres and record the number.
Measure forefoot width at the widest part of the outline.
Repeat for the other foot - always size to the larger foot.

Simple comparison table: measurement types and what they tell you

Feature	Length (heel-to-toe)	Width & volume
What it predicts	Primary size number; best starting point for EU/UK/US charts.	Fit across forefoot and midfoot; affects comfort more than length alone.
How to measure	Trace and measure from heel edge to the tip of the longest toe, in mm.	Measure across widest part of the outline and compare to brand width notes.
How we use it when buying	Convert mm to the brand’s size chart and allow 5-10 mm wiggle room depending on activity.	Choose wide/narrow options, or size up if foot volume is high; consider lacing or insoles.

A practical note before you move on

If you want quick shopping access after measuring, we often browse the Sneakers selection for men or the comparable Sneakers selection for women to compare size charts and product descriptions. These category pages help you filter by size, width options and brand notes before checkout.

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Step-by-step: measure like a pro at home

1. Position and trace with consistency

Do measurements in the late afternoon or after a walk - feet swell slightly through the day. Stand lightly for a more realistic trial: place the paper on a hard floor, heel against the wall, and stand with weight distributed. Keep the pen vertical and trace the outline closely to the foot. Repeat both feet and use the larger measurement.

2. Convert millimetres to the brand chart

Most reliable size charts use foot length in millimetres. For example, if your longest foot measures 262 mm, check the brand’s size chart for the corresponding EU/UK/US size. Allow 5-10 mm extra for running or trainers you want room for thick socks; 3-5 mm is fine for snug, technical fits. If the brand lists a separate internal length (insole length), prefer that over generic size numbers.

3. Decide on allowance by activity

Running trainers: add 7-10 mm for toe splay and downhill running.
Cross-trainers / gym: 5-8 mm is usually comfortable.
Casual sneakers: 3-7 mm depending on desired snugness.

4. Account for width and foot volume

If your forefoot width measurement is above average, look for models that offer 'wide' options or have a roomier mesh upper. Shoes labelled 'narrow' or 'slim fit' may feel tight even if length fits. When in doubt, prefer a size with a slighter longer length rather than forcing width by choosing a too-small size.

5. Use lacing tricks and insoles smartly

Adjust lacing to stabilise the midfoot if the length feels right but heel slips. Thin performance insoles can free up ~2-3 mm of internal space; thick orthotics reduce room and may require a larger size. Brands sometimes note internal volume in product descriptions-check those before you buy.

6. When brand sizing differs

Brands run differently: a UK 9 in Brand A might feel like a UK 8.5 in Brand B even with identical millimetre charts because lasts differ. Always convert your measured mm to the exact brand size chart on the product page. If a product page lists customer fit notes (e.g. 'runs small', 'roomy toe box'), weigh those comments alongside your measurements.

7. Practical South African examples

If you regularly wear thicker socks (seasonal gym classes or braai season hikes), add the extra allowance. For those in coastal areas who prefer roomier casual trainers for hot weather, allow 5-8 mm for breathability and toe movement. For city daily commuters carrying a laptop, a firmer midfoot fit can help stability - match this with width measurements when selecting a model.

Final checks before you buy

Compare your mm measurement against the product’s size chart (not only the numeric size).
Check product notes for 'fits small' or 'wide toe-box'.
Confirm the return and exchange policy so you can swap sizes if needed.

If you want to see products that commonly offer size guides and multiple width options, try browsing the broader Sneakers hub or the Sneakers hub for women. These pages let you filter by size and brand so your new measurements become a practical shopping filter.

Quick tip: record your foot length and width (in mm) in your phone notes with the date. Different seasons and activities may change your preferred allowance; a dated record helps you choose the right trainer next time.

Sources

NHS - How to measure your foot for shoes
American Podiatric Medical Association - Measuring your foot
South African consumer advice on shoe fit and sizing

Last updated: September 2, 2026

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Best size tips for online trainers: measure your foot at home with confidence

Measure in millimetres

Why Choose Bash?

Free Delivery

30-Day Returns

Nationwide Support

Why Choose Bash?

Free Delivery

30-Day Returns

Nationwide Support

Allow activity space

Match brand charts

Why accurate foot measurement matters for online trainers

What you’ll need

Single measurement session: quick checklist

Simple comparison table: measurement types and what they tell you

A practical note before you move on

Step-by-step: measure like a pro at home

1. Position and trace with consistency

2. Convert millimetres to the brand chart

3. Decide on allowance by activity

4. Account for width and foot volume

5. Use lacing tricks and insoles smartly

6. When brand sizing differs

7. Practical South African examples

Final checks before you buy

Sources

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Moreblessings

Palesa

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