How to Measure Your Shoe Size Without a Brannock Device
A sheet of paper, a pencil, and a ruler. That's all you need to substitute the metal Brannock device every shoe store uses. Here's the exact technique.
The Brannock device — the metal foot-measuring contraption every shoe store keeps — gives you three numbers: heel-to-toe length, heel-to-ball arch length, and width. You don't need it. With a sheet of paper and a ruler, you can substitute the two measurements that matter most (length and width) within ±2mm of a Brannock reading.
The Paper-and-Pencil Method
- Tape A4 paper to a hard floor. Carpet compresses under your weight and gives a too-small reading. Use tile, hardwood, or laminate.
- Stand with heel against a wall. Heel + back of calf touch the wall. Full body weight evenly on both feet.
- Mark longest toe with a pencil. Have someone help. Pencil perpendicular to the paper, mark the tip of the longest toe — usually the second toe, not the big toe.
- Measure heel-to-mark in mm. Use a ruler with millimeter markings. The number is your last length (foot's true length).
- Add 10mm. Shoes need 10mm clearance for toe-splay during walking. Last length + 10mm = the shoe length to order.
- Repeat for the other foot. Most adults have one foot 1–4mm longer. Use the larger one.
The 10mm rule
Measuring Foot Width (Optional)
Length is most of shoe sizing. Width is the silent half — and the difference between a comfortable fit and one that pinches.
- While still standing on the paper, mark the widest point on the inside of your foot (just behind the big toe joint).
- Mark the matching widest point on the outside (just behind the little toe joint).
- Measure the distance between marks in mm.
That number maps to a width letter. For more on width letters see what EE, 2E, 4E mean.
| Width (mm) at men's size 9 | Letter (men) | Fit |
|---|---|---|
| 94mm | B | Narrow |
| 100mm | D | Standard medium |
| 103mm | E | Wide |
| 106mm | EE / 2E | Extra wide |
| 110mm | EEE / 3E | XX wide |
| 113mm | EEEE / 4E | XXX wide |
mm-to-Size Conversion
Once you have your foot length in mm (after adding 10mm shoe clearance), convert to your shoe size:
| Foot length + 10mm | US Men | US Women | UK | EU | JP (cm) |
|---|---|---|---|---|---|
| 240mm | 7 | 8.5 | 6 | 39.5 | 24 |
| 245mm | 7.5 | 9 | 6.5 | 40 | 24.5 |
| 250mm | 8 | 9.5 | 7 | 41 | 25 |
| 255mm | 8.5 | 10 | 7.5 | 41.5 | 25.5 |
| 260mm | 9 | 10.5 | 8 | 42 | 26 |
| 265mm | 9.5 | 11 | 8.5 | 42.5 | 26.5 |
| 270mm | 10 | 11.5 | 9 | 43 | 27 |
| 275mm | 10.5 | 12 | 9.5 | 44 | 27.5 |
| 280mm | 11 | 12.5 | 10 | 44.5 | 28 |
| 285mm | 11.5 | 13 | 10.5 | 45 | 28.5 |
| 290mm | 12 | 13.5 | 11 | 45.5 | 29 |
| 300mm | 13 | — | 12 | 47 | 30 |
For full international shoe size conversion see our men's shoe size chart and women's shoe size chart.
When the Paper Method Falls Short
Arch length matters
Specialty boots (ski, hockey, cycling)
Children's feet
Common Mistakes
Measuring on carpet
Carpet compresses 3–6mm under body weight. Always use a hard floor.
Sitting down to measure
Sitting reduces foot length by 1–3mm vs standing. Stand with full body weight for the real measurement.
Skipping the 10mm clearance
Without it, shoes fit "just-barely" and become painful within an hour. Always add 10mm for shoe length.
Measuring only one foot
Asymmetry of 1–4mm is common. Measure both, use the larger.
Measuring in the morning
Feet swell during the day. Morning measurements + true-size shoes = uncomfortable shoes by afternoon.
FAQs
What is a Brannock device?
A metal foot-measuring tool used in shoe stores. Measures heel-to-toe, heel-to-ball arch, and width. The paper method substitutes length and width.
How accurate is the paper method?
Within ±2mm of a Brannock for length, well within half-size accuracy.
Should I add anything to my measured length?
Add 10mm (3/8 inch) for shoe length — standard toe-room clearance.
Does foot length change during the day?
Yes — feet swell up to 6mm over a day. Measure in late afternoon for everyday accuracy.
Do my two feet need separate measurements?
Yes. Use the larger of the two for sizing.
How do I convert mm to US/UK/EU?
250mm = US men's 8 / women's 9.5 / UK 7 / EU 41. Use the brand's chart for exact.
Three Minutes, Lifetime of Right-Size Shoes
Take the measurement once carefully. Save it next to your other body numbers. Online shoe shopping stops being a guessing game when you know your foot length in millimeters and your width letter.
For more shoe sizing reference, see our foot length and width guide, EE shoe widths decoded, and the men's/women's size charts.
Selling shoes on Shopify? Make foot-length sizing one click.
Tailor Size Guide adds a length-and-width recommendation engine to every product so customers find their right fit on the first try.