UK Bed Sizes & Dimensions Guide: CM, Feet & Inches

Choosing a new bed frame is one of those decisions that stays with you every single day. It’s the focal point of your bedroom and the foundation of your sleep, but before you can settle on a style or finish, you need to know exactly what will fit.

In our experience over the past 17 years, the most common mistake isn't choosing the wrong style—it's miscalculating the "footprint" of the bed within the room. A bed should sit comfortably within your space, not fight against it.

This guide provides the exact dimensions for standard UK bed sizes in cm and feet, helping you navigate the difference between mattress sizes and frame sizes so you can plan your layout with confidence.

 

Standard UK Bed Sizes in cm (The Quick Reference Table)

If you are looking for the double bed size in cm or need to compare a King to a Super King at a glance, use the table below. Please note that these dimensions refer to the standard mattress size.

 

1. Understanding the ‘Footprint’: Mattress Size vs. Frame Size

One detail that often surprises people is that a bed frame is almost always larger than the mattress it holds. When we talk about "UK standard bed sizes," we are technically referring to the mattress dimensions.

With a solid wood bed frame, the overall footprint will be slightly larger due to the thickness and construction of the timber. For example:

• Frame Thickness: Solid hardwood posts and side rails add several centimetres to the overall width.

• Headboard Depth: Depending on the design—like a curved sleigh bed or a substantial traditional frame—the headboard can add 5cm to 15cm to the total length.

• Design Proportions: Traditional styles often have more substantial proportions compared to a minimalist panel bed.

We always recommend checking the specific outer dimensions of the frame before making your final decision to ensure it fits the physical space available.

 

2. Measuring Your Room for a New Bed

A successful layout is about more than just fitting the bed in; it's about how the room flows once the bed is there.

• The 50cm Rule: As a guide, aim to leave at least 50cm to 70cm of clear space at the sides and foot of the bed. This provides enough room to walk past comfortably and move around at night.

• Clearance for Furniture: Open every wardrobe door and drawer fully to ensure the bed frame won't block them.

• Fixed Obstacles: Note the positions of radiators, skirting boards, and windows. A headboard sitting just below a window sill often looks more balanced and considered.

• The "Tape" Trick: If you're unsure, mark the footprint of the bed frame on your floor with masking tape. It gives you a realistic feel for how much floor space remains.

 

3. Small Double (120cm) vs. Standard Double (135cm): Which do you need?

We often see customers torn between these two sizes. The Small Double (120cm x 190cm), often called a "Queen" or "Three-quarter" bed, is a brilliant solution for smaller UK bedrooms.

It is ideal if:

• You are a solo sleeper who wants more room than a single but has a narrow room.

• The room is a guest space that only occasionally hosts two people.

• You need to prioritise space for a desk or wardrobe.

However, for most couples, the Standard Double (135cm x 190cm) is the preferred everyday choice as it offers that extra 15cm of width which makes a significant difference in sleep quality.

 

4. Practical Details: Access and Assembly

Before you fall in love with a 6ft Super King, it’s worth thinking about the journey the bed has to take to reach your room.

• Measure Access Points: Check the width of your staircase, the height of your landings, and any tight turns in hallways.

• Assembly Space: Remember you will need a bit of extra room around the bed to actually put it together once it arrives.

• Future Proofing: Solid wood frames are designed to be dismantled and reassembled, which is a great benefit if you plan on moving home in the future.

 

5. Slats and Support: What’s Underneath Matters

The dimensions of your frame are important, but the internal support determines how your mattress feels.

• Sprung Slats: Gently curved and flexible, offering "give" for added pressure relief.

• Solid (Flat) Slats: Straight and rigid, providing a firmer feel and more robust support for heavier mattresses.

• Read the full explanation here

 

Bed Frame Size FAQs

What is a standard double bed size in cm? A standard UK double mattress is 135cm wide and 190cm long. Most wooden frames will add approximately 5–10cm to these dimensions.

How much bigger is a bed frame than a mattress? Because of the timber thickness, a solid wood frame is typically 5cm to 12cm wider and longer than the mattress. This varies by style—a sleigh bed will have a larger footprint than a simple panel design.

Will a King Size bed fit in a 3m x 3m room? While a King Size bed (150cm x 200cm) will physically fit, it will take up half the width of the room. Once you account for the frame and the "walk-around" space, it may feel quite tight unless you have minimal other furniture.

What are the dimensions of a small double in the UK? A small double mattress is 120cm wide and 190cm long (4ft 0" x 6ft 3"). It’s a great middle-ground for guest rooms or teenagers.

 

If you’d like a hand choosing the right bed for your home, feel free to get in touch. We’re always happy to help you find something that fits — properly.

 

 

Other guides: 

Bed frame buying guide: how to choose the right bed for your home

Bed frame care & cleaning guide: keeping your wood looking beautiful

Quiz: Find your perfect bed frame

Sprung vs. Flat Slats: Choosing the Right Support for Your Bed Frame