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Article: How to Use Flat Sheet as Fitted Sheet

how to use flat sheet as fitted sheet

How to Use Flat Sheet as Fitted Sheet

Ever wondered if that charming flat sheet could double as a fitted sheet? You're in luck because we're diving into the nifty tricks of how to use flat sheet as fitted sheet with ease.

First up, we'll talk you through adding elastic to your flat sheet. This method is a fantastic way to get a custom, snug fit that contours your mattress.

For those who prefer a quicker fix, we'll also demonstrate how to use flat sheet as fitted sheet by folding the flat sheet in a way that creates a smooth and secure fit.

Let's get your bedding looking and feeling just right with these easy-to-follow methods.

How to Use Flat Sheet as Fitted Sheet: Step-By-Step

Transforming a flat sheet into a fitted sheet is simpler than you might think. Whether you're aiming for a custom fit or just a quick, neat solution, we've broken down the process into manageable steps.

At this point, you may be wondering, is a flat sheet necessary? No, you could purchase a fitted sheet instead. But if you only have a flat sheet available, here's what you can do.

Method 1: Adding Elastic To The Sheets

Adding an elastic to your flat sheet is a useful way to transform it into a fitted sheet. This method requires some basic sewing skills but offers a satisfying and durable result.

Here's how to do it, based on our observations.

use flat sheet as fitted sheet

Step 1: Preparing The Flat Sheet For Conversion

Start by by laying your flat sheet on a flat surface and make sure that it's smooth and wrinkle-free, else your measurements could be inaccurate.

When selecting a flat sheet for this project, consider using a high-quality option like one from our king size flat sheet collection. These sheets are made from natural, plant-based materials, excellent for hot sleepers.

They are not only soft, comfortable, and breathable but also strong and durable. This makes them an ideal candidate for conversion into a fitted sheet.

Step 2: Measuring And Cutting For A Custom Fit

First, measure the width and length of your mattress. Double the height measurement and add it to the width and length measurements. Our findings show that this way, you have extra material to tuck under the mattress.

Then, for each corner of the flat sheet, you need to cut out a square. The size of this square is determined by the height of your mattress plus a few extra inches for seam allowance.

For example, if your mattress is 10 inches high, you might cut out a 14-inch square from each corner of the flat sheet. This extra size accounts for the depth of the mattress and provides enough fabric for sewing and tucking under the mattress.

using flat sheet as fitted sheet

After cutting out these squares, you'll be ready to move on to the next step.

Step 3: Adding Elastic Bands To The Corners For A Tight Fit

Our research indicates that for this step, you'll need elastic that is about 3/4" wide, although 1/2" or 1" could also work. Cut a 10" piece of elastic for each corner of the sheet. This length is generally sufficient to provide the necessary tension to keep the sheet in place on the mattress.

To attach the elastic, first, sew a shell to enclose it at each corner of the sheet, using the inside folded fabric. Make sure the casing is wide enough to accommodate the width of your elastic. Then, thread the elastic through this casing.

Once the elastic is in place, securely sew the ends of the elastic to the sheet, ensuring it's stretched enough to gather the fabric but not so tight that it causes the sheet to bunch up excessively.

Step 4: Securing The Sheet To The Mattress For Stability

Now that the sewing is done, here comes the fun bit: making your bed with your newly converted fitted sheet. Just like you would with a regular fitted sheet, start by aligning the corners of the sheet with the corners of your mattress.

The elastic bands you've added will help keep these corners in place.

Begin at one corner of the bed and pull the elasticated corner of the sheet over the mattress corner. Make sure it's secure. Then, move to the opposite corner and repeat the process. You're nearly done!

Step 5: Adjusting And Tucking In The Excess Fabric For A Neat Finish

The final step is to adjust and tuck in any excess fabric for a neat finish. Start by smoothing out the surface of the sheet, ensuring there are no wrinkles or bunches.

flat sheet as fitted sheet

If there's any excess fabric, particularly at the corners, neatly tuck it under the mattress.

If the DIY approach seems like too much of a hassle, we can save you time and energy with our 600 Thread Count 100% Cotton Sateen fitted sheet, available in all the standard sizes. Not only will it fit your mattress with ease, but this naturally hypoallergenic cotton sheet will keep you cool while you slumber.

Method 2: Folding The Flat Sheet Over The Mattress

Folding a flat sheet over the mattress is a simpler alternative to converting it into a fitted sheet. This method involves neatly tucking and folding the sheet under the mattress to create a snug fit. Let's break down the steps.

Step 1: Placing The Flat Sheet

Begin by spreading the flat sheet evenly over the mattress. Make certain the sheet is centered, with equal amounts of fabric hanging over each side of the mattress.

Step 2: Tucking The Bottom Edge

Tuck the bottom edge of the sheet under the mattress. Start from the foot of the bed and work your way towards the corners, smoothing out any wrinkles as you go.

This initial tuck secures the sheet in place and is key when it comes to how to keep sheets tucked in.

Step 3: Creating Hospital Corners

At each corner of the bed, create a hospital corner. Lift the hanging fabric at one corner and fold it upwards, forming a 45-degree angle with the corner of the mattress. Hold this triangle in place, then tuck the excess fabric hanging straight down beneath the mattress.

how to use flat sheet

Finally, fold the triangle down over the tucked fabric and secure it under the mattress.

Step 4: Tucking In The Sides

Move along each side of the bed, tucking the remaining hanging fabric under the mattress. Pull the sheet tight to keep the edges neat. And you're done!


In this guide, we've explored two practical methods to transform a flat sheet into a fitted sheet. For those who enjoy a bit of DIY, adding elastic to the corners of a flat sheet provides a personalized fit.

Alternatively, for a quicker solution, we demonstrated how to neatly fold a flat sheet over the mattress.

If DIY isn't your style, we offer a range of fitted sheets. Visit us online and find the ideal solution for your bedding needs with California Design Den. 

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