UGG Size Chart: US, UK, EU & CM Conversion (Men’s & Women’s)

Sep 10, 2026

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Marco Bianchi is a personal shopping advisor and sizing specialist at Cecile Milan Journal, focused on how fit differs from one brand — and one model — to the next. Years spent fitting customers across Nike, Adidas, New Balance and other major sneaker brands inform his brand-to-brand sizing comparisons, model-specific fit notes and practical advice for readers converting their usual size between brands.

UGG runs true to size for most people, though the sheepskin lining packs down and loosens slightly with wear — many wearers find it worth sizing down if they’re between two sizes. Use the tables below to convert between US, UK, EU and CM (foot length) sizing before you order. If you’re between two sizes, see our UGG sizing guide.

Women’s UGG Size Chart

Foot length (CM) is the most reliable column if you’re converting from a brand outside the US/UK/EU system. UGG is predominantly a women’s-first brand, so the women’s range is the widest.

Women’s sizing — US, UK, EU, CM
US	UK	EU	CM
5	3	36	22
5.5	3.5	36.5	22.5
6	4	37	23
6.5	4.5	37.5	23.5
7	5	38	24
7.5	5.5	38.5	24.5
8	6	39	25
8.5	6.5	39.5	25.5
9	7	40	26
9.5	7.5	40.5	26.5
10	8	41	27
10.5	8.5	41.5	27.5
11	9	42	28
11.5	9.5	42.5	28.5
12	10	43	29

Men’s UGG Size Chart

UGG men’s sizes are offered on a separate last, not just a shifted women’s size — always convert using the men’s table below rather than subtracting from the women’s chart.

Men’s sizing — US, UK, EU, CM
US	UK	EU	CM
6	5	39	24
6.5	5.5	39.5	24.5
7	6	40	25
7.5	6.5	40.5	25.5
8	7	41	26
8.5	7.5	41.5	26.5
9	8	42	27
9.5	8.5	42.5	27.5
10	9	43	28
10.5	9.5	43.5	28.5
11	10	44	29
11.5	10.5	44.5	29.5
12	11	45	30
13	12	46	31

How to Use This Chart

Measure your foot length in centimeters from heel to the tip of your longest toe, in the afternoon when feet are slightly swollen, and match it to the CM column — this is more accurate than converting from a size you wear in another brand. Because the sheepskin lining compresses over the first few wears, a pair that feels snug on day one usually settles into a true-to-size fit, so avoid sizing up preemptively unless you measure larger than your usual size.

Frequently Asked Questions

Does UGG run true to size?

Yes, most UGG boots and slippers, including the Classic and Tasman, run true to size once the sheepskin lining breaks in. If you’re between sizes, sizing down usually gives a better long-term fit than sizing up.

Is UGG sizing the same for men and women?

No. UGG men’s styles are built on a dedicated men’s last and are not simply a relabeled women’s size. Use the men’s table above rather than converting from the women’s chart.

What EU size is a US women’s 8 in UGG?

A US women’s 8 converts to EU 39, UK 6, and 25 cm foot length in UGG sizing.