How to Measure Up for Wooden King Size Beds: A Simple Sizing Guide

A UK king size mattress measures about 150 x 200 cm, but a wooden king size bed frame is usually larger, often somewhere around 160 to 175 cm wide and 210 to 225 cm long once side rails, headboard and any footboard are included. To check whether one will fit, measure the room, subtract around 60 to 70 cm for each walkway you need, and compare what remains with the external dimensions of the specific frame you are considering. Then measure the route into the room.

That is the short answer. The longer one involves a few extra checks that save a great deal of trouble on delivery day. Use the steps below alongside the product dimensions for any of our modern wooden king size beds UK, and you will know with confidence whether a frame suits your room.

What you will need

• A metal tape measure of at least 5 metres.
• A notepad, or a photo of the room you can annotate.
• Masking tape for marking the floor.
• A second person, which makes long measurements more accurate.

Step one: measure the room itself

Measure the length and width of the room at floor level, from skirting board to skirting board. Then measure again at about waist height, because walls in older UK homes are not always straight and alcoves or chimney breasts can change the usable width.

Note the ceiling height if you are considering a tall headboard or a four poster style. Also note where the ceiling slopes in loft rooms or under eaves.

Write every measurement in centimetres. It is easier to compare with product dimensions and avoids mistakes when converting.

Step two: map the fixed features

On your sketch, mark everything that cannot move: the door and its swing, windows and sill heights, radiators, built in wardrobes, plug sockets, light switches and any pipework. These features often decide where a bed can go more than the size of the room does.

Pay particular attention to the bedroom door. A king size frame placed too close to the door can stop it opening fully, and the door handle can knock the side rail every time someone comes in.

Step three: choose the bed wall

The headboard usually works best against a solid wall that faces or sits beside the door. Avoid placing it directly under a window where possible, since this can feel draughty and makes curtains and blinds difficult to reach.

Once you know the bed wall, measure the full length of that wall and the distance from it to the opposite wall. These two figures are the key to everything that follows.

Step four: work out your clearances

Clearance is the space you need to walk around the bed, make it and use the furniture nearby. As a guide:

• Allow 60 to 70 cm on each side you use regularly.
• Allow at least 60 cm at the foot of the bed for walking past.
• Allow 90 cm or more in front of wardrobes and chests of drawers so doors and drawers can open while you stand in front of them.
• If the bed has storage drawers, add around 45 to 50 cm on the drawer side so they open fully.

Subtract these clearances from your room measurements. The remaining width and length give you the maximum frame size that will be comfortable to live with.

Step five: compare with the frame, not the mattress

This is where most measuring mistakes happen. People check that a 150 x 200 cm mattress will fit, but forget that the frame adds to it. Wooden beds in particular can have generous proportions:

Side rails often add several centimetres to each side.

Headboards can be deep, especially padded, slatted or panelled designs, adding length at the head end.

Footboards add length at the foot, and solid footboards also reduce the visual openness of the room.

Posts and feet on some designs sit outside the line of the rails.

Always check the overall external width, length and height listed for the specific bed. If the figures are close to your limit, it is worth looking at a frame with slimmer rails or no footboard.

Before deciding, it can also help to see how the bed will sit alongside wardrobes, chests and bedside storage from our wider modern bedroom furniture UK sale collection, since these pieces share the same floor space.

Step six: think about height

Height affects both comfort and fit. Measure from the floor to the underside of any window sill on the bed wall, and compare it with the headboard height. A headboard that rises above the sill can block light or make the window awkward to open.

Consider the height of the mattress on top of the frame too. A deep mattress on a raised frame can lift the sleeping surface well above standard bedside tables. Our mattresses UK sale list their depths, so you can work out the finished height of the bed in advance.

Step seven: mark it out on the floor

Using masking tape, mark the full external footprint of the frame on the floor. Then live with it for a day. Walk around it, open the wardrobe and drawers, and stand at the door to see how much of the room it takes up.

This simple test often reveals whether a king size is right or whether you would be more comfortable with a double. If the room feels generous, you might even consider stepping up. Our wooden super king size beds UK need about 30 cm more width again, so tape that outline too if you are tempted.

Step eight: measure the route into the room

A bed that fits the room still has to get there. Measure the width and height of the front door, the hallway, the turn of the stairs, the landing and the bedroom door. In many terraced houses and flats, the tightest point is the turn at the top of the stairs.

Most wooden king size beds arrive in sections, with the headboard, side rails and slats packed separately. Check the dimensions of the largest box or component, usually the headboard or the side rails, and make sure it can pass through every point on the route.

Common measuring mistakes to avoid

Measuring the mattress, not the frame. As covered above, the frame is always larger. Use the external dimensions every time.

Forgetting skirting boards and radiators. A radiator can stand 10 cm or more from the wall, and deep skirting in period homes stops a headboard sitting flush. Measure from the face of these features, not from the plaster.

Ignoring the door swing. A bed that blocks the door from opening fully will be a daily irritation. Mark the arc of the door on your floor plan.

Overlooking wardrobe doors. Hinged doors need room to open, and you need to stand in front of them. Sliding doors save space but still need clear access.

Assuming walls are square. In older houses, a room can be a few centimetres narrower at one end than the other. Measure in more than one place and work with the smallest figure.

Where a king size works and where it struggles

In many main bedrooms of semi detached and detached houses, a wooden king size bed fits comfortably with walkways on both sides and room for a wardrobe opposite. In typical double bedrooms in terraced houses and flats, it can work too, but the margins are tighter, and a frame without a footboard often makes the difference.

Box rooms and most second bedrooms are generally too small for a king size if you want to move around freely. In those rooms, a double or small double is usually the more comfortable choice, leaving space for storage and a little breathing room.

Plan the bedside furniture at the same time

Bedside tables complete the measurement picture. A king size bed with two tables can take up well over two metres of wall. Our guide to bedside table measurements for UK bedrooms explains how to choose widths and heights that suit your frame, while our article on UK king size bed dimensions for frame, mattress and room size sets out the typical room sizes that suit a king size bed.

When you have your measurements ready, you can compare frames and matching bedroom pieces at Furniture in Fashion.

Frequently asked questions

What size room do I need for a king size bed?

As a rough guide, a room of about 3 x 3.5 metres gives enough space for a king size frame with comfortable walkways. Always check the external frame size and the position of doors, windows and wardrobes in your own room.

How much bigger is a king size bed frame than the mattress?

It varies by design. Slim frames may add only a few centimetres, while wooden beds with thick rails, deep headboards or footboards can add 10 to 25 cm in width and length. Check the listed external dimensions.

Is a UK king size the same as a US king size?

No. A UK king size mattress is about 150 x 200 cm, which is smaller than a US king. Always use UK sizing when buying mattresses and bedding for a UK frame.

Should I choose a king size or a super king?

If your room comfortably allows for an extra 30 cm of width with walkways intact, a super king gives more personal space. If the room is tight, a king size with good clearance will feel more comfortable day to day.