Measure a split topper at four points: width, length, height and split length. That last one is often forgotten, yet it decides whether a split topper fitted sheet lies neatly and both sides of your adjustable bed can move freely. Always measure the topper itself, not just your box spring or bed frame.
The good news is it only takes a few minutes. With a flexible tape measure and the steps below, you’ll quickly know which split topper size you have and which fitted sheet matches.
What exactly you should measure
For a great fit you need more than the standard size. Write down these four measurements:
- the total width of the split topper
- the total length of the split topper
- the topper height or thickness
- the split length at the top
Do you have a topper with a split on both sides, for example on a double adjustable bed? Then check whether you need a double split fitted sheet too.
Measure your split topper in 4 steps
1. Measure the width and length of the topper
Width
Place the tape measure from the left edge to the right edge of the topper. Measure the topper itself, not the mattress underneath or the bed frame. Common widths are 140, 160 and 180 cm, but don’t just trust what you think you have.
Length
Then measure from the top edge to the bottom edge. Most split toppers are 200 or 210 cm long. You’ll often see 210 cm with luxury box springs and longer beds. A 200 cm fitted sheet on a 210 cm topper is usually too tight and pops off the corners more easily.
2. Measure the topper height
Height is often forgotten, but it’s key for a good fit. Measure the topper from bottom to top while it lies flat on the bed. This measurement determines whether the fitted sheet’s corner height is sufficient. If your topper is 8 cm high, for example, choose a split topper fitted sheet that explicitly suits that topper height or a little more. That way the fabric won’t be stretched too tight or go baggy.
3. Measure the split length
Measure straight down from the top edge of the topper to the point where the split ends. This is the measurement that most often goes wrong. On many models the split length is around 80 to 90 cm, but it varies by brand and bed type. If the fitted sheet’s split is too short, the head end can’t move up properly. If it’s too long, you’ll get creases faster or a loose fit in the middle.
4. Check whether you have a single or double split
Most split toppers have a split only at the top. Some adjustable beds require a double split, at both the top and bottom. So take a good look at the shape of your topper before you order. Want to be sure which version you need? Read: Split topper or double split: what’s the difference?.
Common measuring mistakes
- You measure the bed or mattress instead of the topper itself.
- You only look at 160x200 or 180x200 and forget the topper height.
- You confuse a regular topper with a split topper.
- You estimate the split length without actually measuring it.
- You don’t check whether the fitted sheet is suitable for a single or double split.
Doubting between two sizes? Always check the product info for the fitted sheet first. It usually lists the suitable topper height and split length.
Which split topper fitted sheet size do you need next?
Once you’ve noted all the measurements, you can choose with confidence. The fitted sheet size should match the width and length of your topper, while the corner height and split length also need to fit. Only then will the fitted sheet stay smooth, comfortable, and practical on an electric adjustable bed.
| Split topper size | Often matches | Extra things to watch out for |
|---|---|---|
| 140 x 200 cm | compact double beds | check the split length and topper height |
| 160 x 200 cm | standard double box springs | choose a real split topper fitted sheet, not a regular topper fitted sheet |
| Split topper fitted sheets 180x200 | wide double beds | pay extra attention to a neat fit in the middle |
| 160 or 180 x 210 cm | extra long beds | 200 cm is usually too short here |
Did your measurements show that your topper doesn’t have a split? Then pick a non split alternative, like Topper fitted sheet 180x200 (no split).
The material of the fitted sheet matters too. Jersey and other stretchy fabrics are a bit more forgiving with small size differences, while less elastic fabrics need a more precise fit. Want to compare different fabrics and sizes? Check the overview of All fitted sheets.
The difference between a topper and a split-topper
The difference between a topper and a split-topper is the notch at the top. A regular topper is one piece and is meant for a flat or non independently adjustable surface. A split-topper has a split so both halves of an electric adjustable bed can raise separately. That’s why you also need a special split-topper fitted sheet. A normal topper fitted sheet restricts movement or pulls at the split. Want more background and practical examples? Read: What is a split-topper and who is it useful for?.
Frequently asked questions about measuring split-toppers
What size split-topper do I need?
You’ll only know for sure once you measure the topper itself. Write down width, length, height, and split length. The most common sizes are 140x200, 160x200, and 180x200, though 210 cm length is also common.
Can I use a regular topper fitted sheet?
No. For a split-topper you need a fitted sheet with a split that matches your topper. Otherwise the sheet can pull tight, shift, or block the adjustable sections.
What’s the ideal topper thickness?
It varies by person and by mattress, but many toppers are roughly between 6 and 10 cm. For measuring, it’s most important to note the true height so the sheet’s corner height is correct.
Does every split-topper fit every adjustable bed?
No. Besides the overall size, the split length also has to match the bed. Some models even need a double split. Always check both the measurements and the type of split.
What makes a good split-topper?
A good split-topper matches your bed size, has the right split for your adjustable system, and delivers the comfort you like. So don’t just look at material and thickness, but also at the exact dimensions.
Spend a few minutes measuring and you’ll avoid a lot of hassle later. A well fitting split-topper fitted sheet stays smoother, feels nicer, and makes your bed quicker to make. That’s exactly the kind of sleep comfort that makes you happy every night.
