On to Dr. Martens Shoe Size Conversion

Switching from On to Dr. Martens? On runs true to size and Dr. Martens runs large, so the size you order changes. Here's the full chart.

A On 9 works out to a Dr. Martens 8.5 — about half a size down. The chart below has every size.

On → Dr. Martens: size down half a size

A On 9 is a Dr. Martens 8.5.

Find your On size on the left, read across for Dr. Martens:

On size	Dr. Martens size	UK	EU	Foot (cm)
6.5	6	5.5	37	23.5
7	6.5	6	38	24.3
7.5	7	6.5	38.5	24.7
8	7.5	7	39.5	25.1
8.5	8	7.5	41	25.9
9	8.5	8	41.5	26.3
9.5	9	8.5	42.5	26.7
10	9.5	9	43	27.1
10.5	10	9.5	43.5	27.5
11	10.5	10	44	27.9
11.5	11	10.5	44.5	28.3
12	11.5	11	45.5	28.7
12.5	12	11.5	46	29.1
13	12.5	12	47	29.5
13.5	13	12.5	47.5	29.9
14	13.5	13	48	30.3
14.5	14	13.5	49	31.1
15	14.5	14	49.5	31.5

⚠️ Fit varies by model. On (On Running) runs true to size for most, with a snug, performance fit. Dr. Martens runs about half to a full size large and has no half sizes — size down to the nearest whole.

Dr. Martens to On → · On chart · Dr. Martens chart · Brand finder

What is a On 9 in Dr. Martens?

A On 9 is about a Dr. Martens 8.5 — they share a foot length of roughly 26.3 cm (UK 8, EU 41.5).

Do On and Dr. Martens fit the same?

No — On runs true to size and Dr. Martens runs large, so size down half a size when you switch.

ⓘ Affiliate links below. As an Amazon Associate we earn from qualifying purchases at no extra cost to you.

★ Top pick · Recommended on Amazon

Dr. Martens Shoes

Shop Dr. Martens in your converted size.

View on Amazon →

Recommended on Amazon

On Shoes