Measuring and planning tool

Check a mattress protector’s stated fit

Before ordering a mattress protector, check the mattress width, length and height. This tool compares your measurements with the mattress dimensions stated for the protector, adding topper thickness when the protector is meant to wrap over it.

The result checks dimensions only. It does not confirm secure fit, liquid resistance or suitability for a particular purpose. The model’s shape, elastic, corners and fitting instructions still matter.

Open the printable measuring worksheet

What to measure and what to copy from the specification

Measure the bare mattress edge to edge and along its side for height. Measure the topper separately. No personal details are needed: the calculation runs in your browser, and entries are neither saved nor sent.
For a fitted protector, enter the nominal mattress dimensions the product is intended to fit, as stated in its specification. Unstretched fabric measurements may not describe the supported fit. If several sizes or a range are listed, check the exact version you selected.
Enter a maximum mattress height only when the manufacturer explicitly identifies it as the supported height. Sewn pocket or skirt depth is not necessarily the maximum mattress height; do not substitute one for the other without confirmation.
A zipped encasement requires the exact supported height or an approved height range, as well as corner fit. The tool will flag that confirmation. For a flat pad, enter the active protective area, excluding wings or straps, to calculate its possible coverage.

Diagram of mattress measurement directions: width, length and height — Measure the mattress itself; add topper thickness only when the protector will also wrap over it.

You can check without the calculator

The calculation requires JavaScript. You can read the guidance, add mattress and topper thickness, compare width and length with the specification, and fill in the worksheet below. Do not confirm height fit without explicit manufacturer guidance.

Enter dimensions in centimetres

Fields marked with an asterisk are required. You can enter up to two decimal places using a dot or comma. Input ranges limit typing errors; they are not a product-size standard.

Your mattress

Width and length: 20–300 cm. Height: 1–80 cm. Topper: 0–40 cm.

Mattress width (cm) *

Mattress length (cm) *

Mattress height (cm) *

Thickness of a topper wrapped together (cm)

Leave 0 if there is no topper or the protector sits beneath it. An empty field also counts as 0.

The protector specification

Protector type *

Enter width and length between 20 and 300 cm.

Supported mattress width (cm) *

Supported mattress length (cm) *

Manufacturer-confirmed maximum mattress height (cm)

Leave empty when no explicit value is available. Enter 1–120 cm only for a confirmed maximum mattress height, not skirt depth.

Guides to help complete your check

If you are unsure about the product type or the size on its label, start with these guides. After choosing a size, check care instructions too: washing and drying that are unsuitable for the model can affect fit or damage its protective layer.

Enter a number in this required field.Enter a number in centimetres with up to two decimal places, using a dot or comma, without units or other symbols.Enter a value between {min} and {max} cm.Dimensions changed. Run the check again for an updated result.Fields cleared. You can start a new check.The entered dimensions do not matchAt least one dimension does not match the entered specification. Do not assume stretch or elastic will compensate; ask the supplier to confirm this model for your mattress.Dimensions match the stated valuesWidth and length match, and combined thickness does not exceed the maximum mattress height you entered. This is a numerical match only; confirm that the shape and fitting instructions also suit your mattress and topper.Width and length match; height remains unverifiedNo confirmed maximum mattress height was entered. Pocket depth alone cannot establish height fit. Ask the supplier for the supported mattress height and fitting instructions.Width and length match; check encasement heightA zipped encasement needs confirmation for the exact combined thickness or an explicit range that includes it. Check mattress shape and corners too. The tool does not establish encasement height fit from a maximum value.Flat-pad coverage areaThe calculation assumes a flat pad aligned with the mattress width and length. It shows geometric overlap only, without checking straps, absorbency or liquid resistance. Actual placement determines where any uncovered areas remain.Combined mattress and topper thickness{total} cmMattress dimensions: {mw} × {ml} cm. Stated protector fit: {pw} × {pl} cm.Combined thickness is {total} cm; the entered maximum is {max} cm.Possible overlap with the mattress{cw} × {cl} cm — approximately {percent}% of the mattress surfaceTotal width and length left uncoveredWidth: {uw} cm; length: {ul} cmDimensions extending beyond the mattress surfaceWidth: {ow} cm; length: {ol} cmThese values are total uncovered dimensions in each direction, not guaranteed margins on each side. Only a centred pad splits each difference equally between the two sides.Before buying, keep your measurements and compare them with the exact version in the current specification. The printable worksheet can help when checking details with the supplier.Supported mattress width (cm) *Supported mattress length (cm) *Active protective area width (cm) *Active protective area length (cm) *A zipped encasement does not use the maximum-height field. It needs an exact height or a manufacturer-approved range for that model, so height fit will remain unverified.For a flat pad, the calculation covers its protective area only. It does not check height, wings or straps.

MyViro · myviro.co.il

Printable worksheet: mattress protector fit

Record the actual measurements and compare them with the model specification before buying. All measurements are in centimetres.

Measurement record

Room / bed name
Date
Mattress width
Mattress length
Mattress height
Topper height, if present
Total height to be covered

If the protector will cover a topper too, measure the layers together in their intended arrangement without compressing them. Exclude the bed frame and legs.

What does the protector specification say?

Model name
Intended mattress dimensions
Maximum mattress height or approved height range
Attachment: elastic / straps / zipper / other

Skirt height or pocket depth describes part of the protector. It is not necessarily the maximum mattress height approved by the manufacturer. If only pocket depth is stated, request fit confirmation.

Example mattress dimensions

Examples from the sizing guide, in cm. This is not a complete list, a standard, a stock promise or confirmation that a particular protector fits.
Width in cm	Example lengths in cm
80	190 or 200
90	190 or 200
100	190
120	190 or 200
140	190 or 200
160	200
180	200
200	200

Before ordering

The actual width and length fall within the model’s stated fit range.
The total height falls within the approved height range.
The protected area is clear: top surface, sides or a defined area.
I have read the model’s washing and drying instructions.

For an underpad, check the protected area separately; fabric and tuck-in wing dimensions are not necessarily mattress dimensions. For a split bed, complete one sheet per mattress.

Source and detailed explanation: MyViro’s mattress protector size guide.
Mattress protector size guide

A worksheet to complete by hand; it does not certify product compatibility.