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How to Measure Your Mattress: The Comprehensive Guide

Whether you’re looking to replace your old mattress or buy a new one, accurate measurements are essential to ensure a comfortable and well-fitted sleeping surface.

In this article, we’ll guide you through the process of measuring your mattress, so you can make an informed decision and enjoy restful nights.

Table of Contents

The Importance of Accurate Measurements

Getting accurate measurements of your mattress is vital for various reasons:

  • Better Fit for Bedding

Accurate measurements can ensure that your sheets, duvets, and other bedding fit your mattress perfectly, enhancing your sleep experience and the overall aesthetic of your bedroom.

  • Finding the Right Frame

If you’re looking to buy a new bed frame or headboard, knowing the exact measurements of your mattress will help you select the right size for a cohesive and visually pleasing look.

  • Space Planning

When you have the correct measurements, you can plan your bedroom layout more effectively, ensuring your mattress fits comfortably within the available space.

Mattress Sizes Demystified

Understanding mattress sizes is crucial for selecting appropriate bedding and furniture. Here’s a quick overview of common mattress sizes:

Mattress SizeDimensions (Inches)
Twin39″ x 75″
Twin XL39″ x 80″
Full/Double54″ x 75″
Queen60″ x 80″
King76″ x 80″
California King72″ x 84″

Step-by-Step Guide to Measuring Your Mattress

When it comes to measuring your mattress, precision is key. Follow these steps to ensure you get accurate measurements for your bedding:

1. Gather Your Tools and Materials

Before you begin measuring, gather the following tools:

  • Tape Measure: A flexible tape measure ensures precise measurements.
  • Pen and Paper: Keep track of the measurements for easy reference.

2. Remove Bedding and Accessories

You should take off any sheets, blankets, or other bedding from your mattress to ensure you’re measuring the mattress itself and not its accessories.

3. Measure Width

Start by measuring the width of the mattress. You can place one end of the measuring tape against the left edge of the mattress and extend it across to the right edge.

Make sure the measuring tape is taut but not overly tight. Note down the measurement in inches.

mattress dimension

4. Measure Length

Next, measure the length of the mattress. Position the measuring tape at the top edge of the mattress and extend it down to the bottom edge. Again, record the measurement in inches.

5. Measure Thickness

To measure the thickness of your mattress, you can place the measuring tape at one edge and extend it vertically to the highest point of the mattress. This measurement will give you an idea of the mattress’s overall profile.

6. Check for Variations

mattress with round corners

Keep in mind that mattresses aren’t always uniform in shape. Some might have rounded corners or slightly different dimensions.

In such cases, measure the widest points to ensure you get accurate measurements.

7. Note Down Mattress Type

While you’re measuring your mattress, take note of its type. Is it an innerspring mattress, memory foam, latex, or hybrid? This information will be crucial when researching and comparing different mattresses for your needs.

Tips for Accurate Measurements

Here are some valuable tips to enhance your measuring accuracy:

Using a Partner

Measuring larger mattresses can be challenging alone. Enlist the help of a friend or family member to hold the tape measure steady while you record the measurements.

Clear the Area

You need ensure the area around the mattress is clear of obstacles to get an accurate measurement without any hindrances.

Utilize Online Guides

Many mattress brands and retailers provide online guides for measuring their specific mattress models. You can consult these resources for accurate dimensions.

Measure Again Over Time

Over the years, mattresses can lose some height and dimensions due to wear and tear. You need to measure your mattress periodically to ensure you have the most up-to-date measurements.

Frequently Asked Questions (FAQs)

Do I need to measure the box spring as well?

Yes, if you’re using a box spring, measure its dimensions too for accurate sizing.

Can mattress thickness be customized?

Yes, some mattress brands offer customization options for thickness, catering to individual preferences.

What if my mattress is an irregular shape?

For irregular shapes, you can measure the widest points for width and length, and the thickest point for thickness.

Can I use a ruler instead of a tape measure?

Yes, you can, but a tape measure is more flexible and easier to use for longer measurements.

Can I measure my mattress with it placed on a bed frame?

Yes, you can measure the mattress while it’s on the bed frame. Just ensure the mattress is laid flat and not sagging over the edges.

What if my mattress measurements are slightly off-standard?

If your measurements are slightly off, you should prioritize a mattress that’s closest to your recorded dimensions. Some flexibility is acceptable but avoid significant discrepancies.

Are there mattress size differences between countries?

Yes, mattress sizes can vary between countries. Always refer to local standards when shopping for a mattress.

Should I round up or down when measuring?

You can round up to the nearest inch or centimeter for accuracy. This prevents the risk of purchasing a mattress that’s too small.

Can I use a regular tape measure for mattress measurement?

Yes, a standard tape measure works well for mattress measurement. Ensure it’s extended straight for precise results.

How often should I measure my mattress?

It’s a good idea to measure your mattress whenever you’re considering a new bed frame or replacing your mattress.

What if my measurements are in between standard sizes?

In that case, it’s best to choose the larger size to ensure a comfortable fit.

Are there any mattress types that are harder to measure?

Specialty mattresses, like round beds or custom shapes, require more careful measuring due to their unique dimensions.

Is there a specific time of day I should measure my mattress?

Measure your mattress when it’s on a flat surface and not on an uneven bed frame for the most accurate results.

What's the most common mistake when measuring a mattress?

One common mistake is not measuring the mattress at its widest and longest points, which can lead to purchasing ill-fitting bedding.

Are there custom mattress sizes not listed in the table?

Yes, some specialty mattresses might have unique measurements. In such cases, follow the same measuring steps to determine the dimensions accurately.

Do I need to measure the height of the mattress if I'm only buying sheets?

While measuring the height is not crucial for purchasing sheets, it can help ensure a snug fit. Some sheets are designed for deeper mattresses, so having the height measurement can be beneficial.

Do I need to measure the corners of my mattress?

While measuring the corners isn’t essential, it can help if your mattress has unique contours or rounded edges. It’s especially important if you’re looking for a fitted sheet that needs to accommodate these variations.

Should I include the mattress's edge details in the measurements?

Yes, it is important to include the mattress’s edge details in the measurements to ensure a proper fit and accuracy in dimensions.

Do mattress thickness and height mean the same thing?

No, mattress thickness and height do not mean the same thing.

How do I measure a waterbed or an air mattress?

To measure a waterbed or an air mattress, you can follow these steps:

1. Start by deflating the mattress or draining the waterbed if necessary.

2. With a measuring tape, measure the length of the mattress from one end to the other, ensuring you get an accurate measurement.

3. Measure the width of the mattress from one side to the other, making sure to measure in a straight line.

4. If the mattress is not rectangular or has any irregular shapes, measure each section individually and add up the measurements for a total size.

5. Document the measurements in either inches or centimeters, depending on your preference.

By following these steps, you can accurately measure the dimensions of a waterbed or an air mattress for various purposes such as fitting it into a specific space or purchasing the appropriate beddings.

Are there standardized measurements for crib mattresses?

Yes, there are standardized measurements for crib mattresses. The Consumer Product Safety Commission (CPSC) in the United States has set regulations that specify the size of a standard crib mattress.

According to these regulations, a crib mattress should measure about 27 ¼ inches by 51 ⅝ inches, with a maximum thickness of 6 inches. 

What's the best way to measure a mattress with rounded corners?

The best way to measure a mattress with rounded corners is to use a flexible measuring tape or a string.

You can start by placing one end of the measuring tape or string at the bottom left corner of the mattress and stretch it diagonally to the top right corner, following the curve of the rounded corner. Take note of the measurement either in inches or centimeters. 


In the pursuit of unparalleled comfort, measuring your mattress accurately is the foundational step. A well-fitted mattress not only enhances your sleep quality but also extends the lifespan of your mattress.

By following our simple step-by-step guide, you can confidently choose the perfect mattress that aligns with your bed frame and preferences. Say goodbye to discomfort and hello to rejuvenating sleep!

Author: Jessica

Jessica is a lover of both life and gardening. She loves to share his passion for both on social media. He often posts about his latest gardening projects, as well as tips and tricks for others who might be interested in starting their own gardens. She also frequently posts about the different aspects of his life that he enjoys, from spending time with friends and family to exploring new places.

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