Comfort
Mattress Topper Thickness Calculator
Quick answer
The topper thickness that makes the change you want, and what it does to sheet fit.
The topper thickness that makes the change you want, and what it does to sheet fit. The formula is shown under the calculator, and every figure it uses is labelled as either an industry standard or a convention, so you can see which parts are settled and which are guidance.
Result
noticeable change
- Topper thickness
- 3 in
- Change in feel
- Noticeable
- New stack depth
- 15 in
- Sheet pocket needed
- Deep pocket
The most common choice. A clear softening, and the point where sheet pocket depth starts to matter. Your sheets will need a deep pocket.
The formula
Thickness follows how much change you want: 2 in mild, 3 in noticeable, 4 in large. The topper also adds its full thickness to the sheet pocket depth needed.
Products for this answer
These re-order as you change the numbers above. Prices change often.
EGOHOME 2 Inch Twin Memory Foam Mattress Topper- Cooling Gel Infused
$21.102 inch memory foam topper in twin.
Check price on Amazon
EGO 2 Inch King Mattress Topper Gel Memory Foam for Pressure Relief
$49.492 inch memory foam topper in king.
Check price on Amazon EGO 3 Inch Queen Mattress Topper Gel Memory Foam for Pressure Relief
$68.983 inch memory foam topper in queen.
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DOWNCOOL 3 Inch Queen Mattress Topper
$119.993 inch memory foam topper in queen.
Check price on AmazonFrequently asked questions
How does the mattress topper thickness calculator work?
Thickness follows how much change you want: 2 in mild, 3 in noticeable, 4 in large. The topper also adds its full thickness to the sheet pocket depth needed. The calculation runs in your browser as you type, and the working is shown line by line beside the result so you can check it against your own measurements rather than taking the number on trust.
Are these figures an industry standard or a convention?
This is convention rather than a measured standard. Guidance such as replacement intervals, firmness by body weight, pillow loft by position and walking clearance is widely repeated across the industry but is not defined by any standards body. Treat the result as a sensible starting point, and use the figure your own manufacturer publishes wherever one exists.
What happens if I enter numbers outside the usual range?
It stops and says so rather than guessing. When the inputs fall outside what the published data supports, the result reads "Not enough to answer" instead of showing a confident figure. A disclaimer does not make a wrong number right, so returning nothing is the honest outcome when the underlying data does not cover your case.
Does this calculator store the numbers I enter?
No. Everything is computed in your browser and nothing you type is transmitted or saved. There is no account, no login and no record of your measurements. You can block cookies entirely and every calculator on this site will still work exactly the same way.
How to read the numbers on this page. Standard mattress and bedding dimensions are industry-wide and the same across manufacturers. Guidance like replacement intervals, firmness by body weight and walking clearance is convention rather than a measured standard, and every table here says which it is. Where a manufacturer does not publish a figure we leave it out instead of estimating. This is not medical advice: a mattress is not a treatment for a medical condition, and persistent pain is a reason to see a clinician.