Step-By-Step Guide: How To Turn Flat Sheets Into Fitted Sheets

Do you have some flat sheets lying around? Want some fitted sheets for your bed but don’t have the expense to spare? Learn how to turn flat sheets into fitted sheets in easy, DIY steps!

blue fitted sheet on a white mattress

Fitted sheets cost more than flat sheets. However, with a little bit of sewing, some handy skills, and the right set of instructions, you can easily turn old flat sheets into beautiful, alluring fitted sheets that cost way less than new ones from the market and will last for a long time. Ready to get started? Let’s dive right in!

Turn Flat Sheets into Fitted Sheets – DIY Steps

You can easily create beddings by sewing fitted sheets yourself. Here’s how you can make fitted sheets from flat sheets in a simple, DIY tutorial.

Things You Will Need

You’ll need the following checklist to get started with your DIY Fitted sheets.

  • Flat sheet
  • Elastic
  • Thread
  • Pins
  • Pair of Scissors
  • Measuring Tape
  • Serger
  • Cutting Mat
  • Rotary Cutter

Here’s a key takeaway before you start the cost-saving DIY technique. Pre-wash the sheets before cutting if you’re using fresh new flat sheets. Otherwise, you might wind up with your own fitted sheets that don’t fit your bed. This is because textured cotton shrinks when you wash it.

Washing sheets in the washing machine


1. Measure Your Bed

Make sure nothing but a mattress cover is on your bed ( in case you are using one). Start measuring from one cornered edge of the sheet to the other with the help of the measuring tape. Ensure that the tape is level and flat. Measure the width, the length and the depth of the mattress (or else height). 

2. Cut the Flat Sheet

Now it is time to measure your cloth so that you can cut your sheet. There are many fitted bed sheets calculators available online. Just put the three dimensions (length, height, width) into the calculator, and you will immediately obtain your cloth’s measurements.

You may also calculate yourself using the following guidelines:

  1. Width of your mattress – A
  2. Length of your mattress – B
  3. Height of the mattress – C

For the width, begin with your mattress width (A) and double the height (C x 2). Add 12.8 cm beneath the mattress for 2 seam allowances. D is the final measurement for this.

For the length, add your mattress length (B) two times (C x 2) and an extra 12.8 cm. The outcome will be E. D is the breadth of the sheet, whereas E is the length of the sheet. 

Cut your sheet according to the mattress size. Now here’s a pro tip in this step – If your fabric is printed with a pattern, be sure it is cut in the proper direction!

3. Cut the Sheet Corners

Now you’re going to cut corners. Add 6 cm to the measurement C. This is measurement – F. Fold the fabric first half by length, then half by breadth again. This stacks the four corners in one place—Mark the measurement F, beginning at the corner on each side. Use a rotary cutter and cutting mat to cut out the square, and mark the width and length as X and O. 

Cotton fabric and sewing tool consist of scissor, ruler and measurement tape on wooden table

4. Sew the Sheet Corners

With the right side, fold over one corner and match it to the X and O marked. Sew using the 2 cm seam allowance from the X and O marks to the missing square. Then cut and zigzag stitch the raw edge or fasten the edge with an overlock four-thread.

Here’s a tip on this step – you may stitch the corners together with a French seam to make your fitted sheets look even more sturdy. For the other three fitted corners, repeat the same process. Then try your work-in-progress sheet on the mattress to make sure that you are on the right track.

5. Attach the Elastic

If you have a Serger available, stitch the sides of the fitted sheets with a three-thread overlock. You may use a four-thread overlock to avoid pulling one needle and spooling off! If you don’t have one available, then fold the bottom sheet from 2 cm from all the sides and iron them.

Measure 30 cm from each corner seam in both directions—Mark the places using your cloth marker or pins. Now set one end of the strand on the wrong side from the overlocked hem. Stitch a few zigzags on top of each other with a stitch length of 0.

woman using a sewing machine

Sew in the elastic on the folded sides. Don’t stitch into the second layer. Make sure that you are sewing the elastic on the side of the sheet that will stay hidden. Select your sewing machine for a three-step zigzag stitch, using the maximum stitch length. 

Select a width that allows you to sew on your stretched elastic and barely on either side of the material. Testing your fabric is crucial here – a median width of 2 cm works nicely for the elastic and the machine described for use in these instructions.

The best approach to connect the elastic is to draw it up, then pin it to the cloth using your right hand, and pin the elastic after every 3 or 4 cm. Whenever you finish stitching, don’t forget to double verify that your needle is in position – don’t tug the fabric: simply hold it tight to let the machine take in the fabric consistently and gently. 

Now cut off the remaining elastic. Pull the elastic and witness the three-stage zigzag magic: repeat the process for the other three corners of your sheet set.

6. Sew the Hem

Fold almost 2 cm of fabric from each side and press using an iron. Starting at the middle of a long side of the mattress, away from the corners of the sheet, attach the hem from the opposite side of the top sheet. Don’t forget to backstitch the seams. 

A suggestion for this stage is to sew on a marking tab. If you have a queen-sized or king-sized bed with comparable but non-identical measurements on the sides, you will not have to guess the measurements. 

If you want to embellish and adorn your bedsheet, now is the time. You can embroider patterns on it, adorn it with some lace, etc. – the choices are endless. Here it goes! Your new fitted sheet is ready! If you have some fabric left, you can make pillowcases for the crib sheets you have just made. 

Fitted bed sheets are one of the favourite inventions of many people. Flat ones not only get crumpled at the corner of your bed, but they also tend to slip, and you end up sitting on the bare mattress in the morning.

Bed corner with white fitted sheet

Most of the time, when we buy duvet cover sets, the sheets that come along with them are flat bed sheets. In such cases, you can easily turn the flat sheets into fitted sheets using the simple and easy to follow DIY tutorial steps for beginners that we have given above.

Make your bed comfortable and start having sweet dreams, folks!

Scroll to Top
Send this to a friend