How to make a flat sheet into a fitted sheet

So I was on the lookout the other day for some fitted sheets.  Guess what, you cannot find just a fitted sheet.  Ok let me rephrase that, you can find a fitted sheet in the 200 thread count itchy scratch sheets.  Once you get to 400 thread count or higher you can only find sets.  And believe me I went to 5 different stores looking.  So if you don’t need a flat sheet, fitted sheet and two pillowcases, what are you to do?  Also, what do you do with all the flat sheets you have stacked in the linen closet gathering dust.  That’s when I decided I was going to make flat sheets into fitted.

It was surprisingly easy.  I found this tutorial online from Crafting a Green World.  There is a little bit of math involved but if I can do it you can.

Step 1:  Measure the length of both your mattress and your sheet {note the use what you have at your finger tips tape measure I used}

bed sheet

Then subtract the sheet length from the mattress length.  Do the same for the width.  You will end up with two numbers probably in the 20s {Depending if you bought odd sized sheets or mattress lol}

Step 2: You should now have two numbers in the 20s {most likely}.  Take the smaller number and divide it in half.  This is the MAGIC number {wahahaha}.

Step 3:  Take your magic number and measure out a square from each of the four corners.  All sides of the square should measure your magic number.

step 2

I just took my handy dandy tape measure and measured across from one corner to my magic number and then down from the same corner to my magic number and several spots in between.  I made a dot at each measurement and then connected the dots.

Step 4:  Cut out that corner square

step 4

step 5: Remove the square you cut, bring together the two cut edges and sew along them.  Make sure to bring right sides together.

step 5

step 6:  Cut your elastic.  Use a wide elastic.  Something like a quarter inch is not substantial enough to hold up to the tossing and turning and jumping on the bed that happens.

step 6

Step 7: Sew your elastic along each corner.  Stretching as you go.

step 7

And there you have it.  A flat sheet to a fitted sheet.  It’s really pretty simple.  If you have any questions please ask!!



  1. A timely post for me. I've made crib sheets–long ago, but need to do something with a flat queen sheet to make it fit the new air mattress for camping. I thought it would hold better if I made the bottom edges fitted. Must keep those toes covered on those cold mountain mornings. I was going to have to look up a tutorial. So, thanks!

  2. Craft to Do says:

    Thanks for this, my daughter doesn't like a top sheet so I have a whole cupboard full.
    Will be working out the magic number soon and making some new sheets
    Thanks Sandra

  3. Connie- What a great post! Love your blog. Thanks so much for stopping by my blog and your sweet comments. I am enjoying looking at your book club books. LOve to read!!

  4. Tracy ~ Craft Junkie Too says:

    Hi Connie — what an awesome project! Your blog is adorable….thanks for sharing your project on the T.G.I.F. Linky Party at

  5. Life With Lucy says:

    This is such a great tutorial! I currently live in a country where they don't use them, so this is SO helpful! Thank you so much for sharing!

  6. Mami Made It says:

    Billiant idea! Never thought of this. Thank you!

  7. BarefootTams says:

    Great tutorial! Recently couldn't find a fitted sheet to match the top sheet I wanted… perfect!

  8. J A C Q U E L I N E says:

    Thank you so much for this! If I could give you a hug I would! Now can you also teach us how to fold the fitted sheets :)
    Great job!

  9. MamaBug says:

    A super idea…my flat sheets don't wear at the same rate as my fitted. Thanks for the post!

  10. Natalie says:

    This is awesome! I was wondering how I would do this a couple of days ago. (We are a family that doesn't usually use the top sheet and I thought it would be great if I could just turn those into fitted sheets). Now I can! Thanks. :)

  11. I just bought an air mattress for additional house guests. The sheets sold for this application
    are really awful. I thought I convert a flat sheet into a semi-fitted sheet since a
    standard flat sheet cannot be ‘tucked’ neatly or securely with these mattresses. Loved
    the “magic number” concept. That was a confidence builder–no guessing.

  12. been looking also for fitted sheets cost at a arm and a leg. Anyway I have done this for baby fitted sheets and was hoping to find the measurements for a queen bed thank you so much. Wish you gave us a finished picture of the sheet.

Speak Your Mind


CommentLuv badge