This American Mattress Sizes Guide is fully updated to reflect the US mattress product pages, size variants, and collection pages available at Robinsons Beds. 

American mattress sizes are not the same as UK sizes, even when the names sound familiar. This guide explains every US size in detail and links directly to the most relevant Robinsons Beds pages.

For a full UK, European, and international comparison, see the main Mattress Size Guide.

 

American Mattress Size Comparison Table (Inches & CM)

US Mattress Size	Dimensions (Inches)	Dimensions (CM)	Closest UK Comparison
Twin	38” x 75”	96.5 x 190.5 cm	Narrower than UK Single
Twin XL	38” x 80”	96.5 x 203 cm	Longer than UK Single
Full (US Double)	54” x 75”	137 x 190.5 cm	Smaller than UK Double
Queen	60” x 80”	152.5 x 203 cm	Larger than UK King
California Queen	60” x 84”	152.5 x 213 cm	Longer than UK King
American King	76” x 80”	193 x 203 cm	Wider than UK Super King
California King	72” x 84”	183 x 213 cm	Longer than UK Super King

 

American Twin & Twin XL Mattresses

Twin (38” x 75”)

American Twin mattresses are ideal for children, teenagers, and compact guest rooms. They are slightly narrower than a UK Single.

Twin XL (38” x 80”)

Twin XL mattresses offer additional legroom and are popular in US college dorms and for taller sleepers.

Compare these sizes against UK options in the mattress size guide.

 

Full (US Double) Mattresses – 54” x 75”

The US Full mattress is often mistaken for a UK Double, but it is narrower. It is best suited to solo sleepers who want extra width without the length of a Queen.

This size frequently appears as a variant option on US mattress product pages, so always check the listed dimensions before ordering.

 

USA Queen Mattresses – 60” x 80”

The US Queen mattress is one of the most popular American sizes and is significantly wider and longer than a UK King.

Queen size mattresses are commonly used in:

• Master bedrooms

• US-style bed frames

• Imported American beds

Always ensure your bed frame is specifically designed for 60” x 80”.

 

USA American King Mattresses – 76” x 80”

The American King mattress offers exceptional width and is ideal for couples wanting maximum sleeping space.

Key points:

• Much wider than a UK Super King

• Requires a US-specific bed frame

• Bedding must also be American King size

 

USA California King Mattresses – 72” x 84”

The California King mattress is designed for taller sleepers, offering extra length while being slightly narrower than a US King.

Browse California King mattresses.

Ideal for:

• Tall individuals

• Large bedrooms

• Luxury US bed setups

 

USA California Queen Mattresses – 60” x 84”

The California Queen mattress (60” x 84”) combines the width of a standard US Queen with the extra length of a California King. This makes it an excellent option for taller sleepers who don’t want the full width of an American King.

Key Benefits of a Cali Queen Mattress

• Same width as a US Queen (60”)

• Extra 4 inches in length compared to a Queen

• Ideal for sleepers over 6ft tall

• Easier bedroom fit than a US King

👉 View the full collection here:

https://www.robinsonsbeds.co.uk/collections/usa-cali-queen-size-mattress-60-x-84

 

Why US Mattress Sizes Need Special Attention

When buying American mattresses in the UK:

• US mattresses will not fit standard UK bed frames

• Size names like King and Double are misleading

• Mattress variants must be checked carefully

• Sheets and protectors must match US sizing

This is why Robinsons Beds clearly labels US mattress sizes, variants, and collection pages to avoid confusion.

Choosing the Right Bed for Your American Mattress

At Robinsons Beds, we help customers:

• Match US mattresses to the correct bed frames

• Understand American vs UK sizing differences

• Choose the correct mattress variant

• Avoid costly sizing mistakes

If you’re unsure whether your mattress is US Queen, American King, or California King, use this guide alongside our Mattress Size Guide.

Expert Advice on American Mattress Sizes

Buying an American-sized mattress is an investment. With accurate sizing, clear comparisons, and direct links to the correct collections, Robinsons Beds makes it easy to get the perfect fit—first time.

For further advice on US mattress sizes or bespoke bed solutions, contact our expert team today.