How to Measure Your Foot Size at Home (3 Methods, 30 Seconds)

Why Standard Size Charts Don't Work

A size number is a label a brand chose, not a length. Two brands can agree on it and then disagree one rung later — look at the EU column below, where Nike counts 42, 42.5, 43 and Adidas counts 42, 42.7, 43.3:

Foot Length	Nike US	Nike EU	Adidas US	Adidas EU
25.5 cm	7.5	40.5	7.5	40.7
26.0 cm	8	41	8	41.3
26.5 cm	8.5	42	8.5	42
27.0 cm	9	42.5	9	42.7
27.5 cm	9.5	43	9.5	43.3
28.0 cm	10	44	10	44

Here the US column happens to match all the way down, which is the common case: 115 of our 139 charts put a US 9 at 27.0 cm. The other 23 do not, and there the gap is real — a Red Wing 9 is a 25.5 cm foot and a Pikolinos 9 is 27.7 cm, 22 mm apart on the same number. A generic "EU to US" converter cannot know which of the two you are looking at. Brand-specific charts can.

Method 1: Wall + Ruler (Most Accurate)

This takes 30 seconds and reads directly to the nearest millimetre, with no tracing step to add error.

1. Stand on a hard floor, heel touching the wall. Wear thin socks or go barefoot.
2. Place a ruler (or tape measure) on the floor, from the wall towards your toes.
3. Read the measurement at the tip of your longest toe (not always the big toe).
4. Measure both feet — use the larger number.
5. Measure in the afternoon — feet swell during the day, just like when you walk in shoes.

Your number is in centimeters. Multiply by 10 to get millimeters (e.g., 27.0 cm = 270 mm).

Method 2: Paper Trace

1. Stand on a sheet of paper on a hard floor.
2. Trace around your foot with a pen held vertically.
3. Measure the longest distance from heel to toe on the outline.

This method is a little less repeatable than the wall method (the tracing line adds its own width) but works without a wall.

Method 3: Credit Card Reference (No Ruler Needed)

A standard credit card is exactly 85.6 mm long. Use it as a reference:

1. Stand with heel against the wall.
2. Place the credit card next to your foot on the floor.
3. Count how many card-lengths fit from wall to toe.
4. Multiply: card-lengths × 85.6 = foot length in mm

Example: 3.15 cards × 85.6 = 269.6 mm ≈ 270 mm.

Common Mistakes to Avoid

Mistake	Why It Matters	Fix
Measuring while sitting	Foot is shorter unloaded — you'll get a size too small	Always stand with full weight on foot
Measuring only one foot	Most people have one foot larger	Measure both, use the bigger number
Morning measurement	Feet swell 3-5mm during the day	Measure in the afternoon
Thick socks	Adds 2-3mm to measurement	Measure barefoot or in thin socks
Rounded numbers	"About 27 cm" could be anywhere from 26.5 to 27.5 cm	Measure to the nearest millimeter

Size Conversion Table (Men's, seven brands)

Foot (cm)	Nike	Adidas	New Balance	Hoka	ASICS	Brooks	Puma
25.5	US 7.5	US 7.5	US 8	US 7.5	US 7.5	US 7.5	US 7.5
26.0	US 8	US 8	US 8.5	US 8	US 8	US 8	US 8
26.5	US 8.5	US 8.5	US 9	US 8.5	US 8.5	US 8.5	US 8.5
27.0	US 9	US 9	US 9.5	US 9	US 9	US 9	US 9
27.5	US 9.5	US 9.5	US 10	US 9.5	US 9.5	US 9.5	US 9.5
28.0	US 10	US 10	US 10.5	US 10	US 10	US 10	US 10

Data from manufacturer size charts. Between Nike and Adidas the US column matches and the EU ladders do not; between a sneaker brand and a boot brand the US column moves too.

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