Bed gap filler: how to measure the headboard gap and pick the size

Who needs a bed gap filler?

Many beds leave a space between the mattress and the headboard or wall. Pillows slide into it overnight, and glasses or a phone disappear behind the bed. A bed gap filler, also sold as a mattress gap filler or headboard gap filler, is a long foam wedge that closes that space.

It is most useful for people who read or sit up in bed, and for anyone who finds it hard to bend down and fish items out from behind the frame. It will not change how the bed feels, and it is not the right fix for every gap.

• Readers who prop pillows against the headboard every night
• People who struggle to reach or bend behind the bed
• Beds pushed against a wall with a visible gap
• Guest rooms where pillows keep ending up on the floor

Why is there a gap between the mattress and headboard? Free fixes first

Before buying anything, find the cause. Common ones are a mattress shorter than the frame, a headboard bolted further back than it needs to be, a mattress that creeps away on a slatted base, or a bed that has drifted off the wall.

Some causes have free fixes. Living Spaces notes that many headboards can be lowered or moved by loosening the bolts, repositioning and retightening, and that a taller foundation can close a gap below a high headboard. Pushing the frame tight to the wall solves the wall version.

• Mattress shorter than the frame: a filler or a correctly sized mattress
• Headboard set back: move or lower it on its brackets
• Mattress creeping away: a non-slip pad under the mattress
• Bed drifting off the wall: push it back and check the feet
• Gap at the side, beside a bed rail: get personal advice, not a filler

How to measure for a bed gap filler, and which size to buy

Gaps are rarely even. With the mattress in its usual position, measure at both ends and in the middle, then note the widest figure. Measure the mattress width too, because fillers are sold by bed size.

Check the mattress top height above the frame. A filler that sits far below the top of the mattress will not stop pillows slipping, and one much higher can feel like a ridge under your head.

Then compare your widest figure with the product's stated range. Vekkia, for example, says its wedge is designed for gaps from 0 to 5.5 inches (0-14 cm), and XetraDesign says its wedge fits gaps up to 7 inches (18 cm). If your gap is wider, fix the cause first rather than forcing in a bigger wedge.

• Widest gap, measured at three points with the mattress in place
• Mattress width: Twin, Full, Queen, King or California King
• Mattress top height above the frame or headboard rail
• Space for cables and any wall outlet behind the bed

Bed gap fillers compared: Vekkia and XetraDesign

We found two bed gap fillers whose listings and maker pages we could match. The facts below come from Vekkia's and XetraDesign's product pages. They describe what each maker states, not how it performs in your bed.

Both makers sell the same design across several sizes. The Vekkia Amazon listing we checked is the Queen size in white, so pick the size that matches your own mattress before adding it to your cart.

How to fit a bed gap filler, care and common mistakes

Push the mattress toward the headboard, slide the wedge into the gap, then let the mattress settle back. The flat side usually faces the headboard. Check the fit after a few nights, because foam relaxes and mattresses move.

Wash the cover as the care label directs, and let new foam air out after unpacking. Most problems come from the wrong length or depth: a filler shorter than the mattress leaves open ends, and one that is too large pushes the mattress forward and opens a gap at the foot.

Keep the side pockets for light items. Weight can pull the wedge down into the gap, and hard objects are uncomfortable to roll onto at night.

• Smooth the fitted sheet before placing the wedge
• Recheck the gap after the first week
• Match the filler length to the mattress width
• Replace the wedge if it flattens or sags at one end

Is a bed gap filler safe? When filling the gap is not enough

A gap filler is a comfort product. It is not designed or tested as a safety barrier. The FDA warns that the bed frame, rails and mattress should leave no gap wide enough to trap a person's head or body, and that people with confusion, restlessness or poor muscle control are at higher risk.

If you are filling a gap because someone slides toward it, gets stuck or has been found wedged, stop and ask a clinician, occupational therapist or care provider. They can look at the whole bed setup, including rails and mattress fit.

• Do not use a filler to manage entrapment risk
• Ask for advice if the sleeper has dementia, restlessness or poor muscle control
• Never wedge foam into hospital or adjustable bed gaps without the maker's approval
• Keep loose items out of beds used by people at risk