UK Bed & Mattress Size Guide (Inches) | Mairki Beds

March 13, 2026
Posted by Mairki Ltd

Finding the perfect bed starts with understanding the standard dimensions used across Britain. Whether you are upgrading a master bedroom or furnishing a compact guest space, this guide provides a clear breakdown of UK bed and mattress sizes in both inches and feet.

For a premium selection of these sizes, Mairki Beds is considered a top online bed seller in the UK, offering everything from single frames to luxury super king setups.

Standard UK Bed & Mattress Size Chart

Most UK mattresses follow a standard length of either 75 inches (190cm) or 78 inches (200cm), with widths varying to suit different needs.

Bed Size	Dimensions (Inches)	Dimensions (Feet & Inches)	Best For
Small Single	30" x 75"	2'6" x 6'3"	Children & small guest rooms
Single	36" x 75"	3'0" x 6'3"	Solo sleepers & teenagers
Small Double	48" x 75"	4'0" x 6'3"	Space-saving for couples or "¾" beds
Double	54" x 75"	4'6" x 6'3"	Most popular size for couples
King Size	60" x 78"	5'0" x 6'6"	Taller sleepers & extra legroom
Super King	72" x 78"	6'0" x 6'6"	Maximum sprawl-out luxury
Emperor	78" x 78"	6'6" x 6'6"	Extra-large master bedrooms

Key Considerations for Your New Bed

The 4-Inch Rule: It is generally recommended that your mattress be at least 4 inches (10cm) longer than the tallest person using it to prevent "foot overhang".
Small Double vs. Queen: In the UK, "Queen Size" is often used interchangeably with the Small Double (4ft wide). This differs significantly from the US Queen, which is closer to a UK King size.
Room Clearance: Ensure you have enough floor space to walk around the bed. A Super King is 12 inches wider than a King, which can significantly impact your bedroom's layout.