Tutorial — Mitered Corners

Posted on April 3rd, by Amy in Tutorial. 41 comments

Start with a small mitered corner application to gain confidence in making excellent mitered corners every time!

To start gather notions and fabric scraps to practice :


My square measures 8 1/2 inches, and the 4 strips are 1 1/2 x 12 inches. Take special note here: when making mitered corners your strip length needs to be much longer than your square, the wider your strip, the more length you need. I don’t have a formula here, but when in doubt make it longer :) When I was doing this the first time on my tree skirt, I ended up making my first round of border half the width to accommodate the miter — it wasn’t long enough for the width.

On with the instructions:


pin your strips, center on your square, on opposite sides


Sew with 1/4″ seam — I don’t reinforce my seams at all, it may be helpful to pull out a few stitches when setting the miter.


I press open here to cut down on bulk


pin and sew opposite sides borders to the square


Press open again


Fold your square on the diagonal, this works for rectangles too, but you would need to do one corner at a time.


Match up your seams, making sure that the corner is lying flat without excess, and pin


This is how I pin, you don’t want the seams to move, and you need your tails to be secure as well


You can do both corners at once, just flip it over for the opposite corner


Next line up your ruler on the diagonal, and mark the sewing line on the tail, like so –


And sew on the line that you drew


Open up your square to check your corner


If you are pleased, trim to 1/4″ seam allowance, and press, if it’s not quite right just pull out your stitches and try again. Take your time lining things up :)

Now go back and fold in the opposite diagonal and repeat


I like to trim up the extended seam allowances


You should have 4 of these!

Mitered Corner Tutorial

So far I’ve used this technique for my tree skirt, and a few swap blocks. I envision throw pillows on the couch as the perfect project for mitered corners. Maybe that will be next :)

I think that’s everything! Let me know if you have any questions and I will do my best to answer them :) Have a great weekend!


41 thoughts on “Tutorial — Mitered Corners

  1. Thanks Amy. I’ll bookmark it and perhaps I’ll actually do mitered corners sometime. I have done them in the past…many years ago…with great frustration! I shall not give up.

  2. Thanks for the tutorial! I was kind of envisioning this was the way you made them, but this makes it so much clearer! : )

  3. This is a great tutorial. It will definitely go into my bookmarks so I can use it as a reference in the future. :)

  4. Great tutorial! There are so many ways to miter and I love your way. I will have to try this one, it makes a lot of sense. Thanks!

  5. This is a terrific tutorial…I’ve already bookmarked it! My grandmother showed me this method many years ago…but I had forgotten the specifics…so thank you!

  6. Fabulous! Thanks for the awesome tutorial! I’ve always been intimidated by mitered corners, but you make it look so easy!

  7. Excellent tutorial Amy – Thanks for taking the time – You make it look so easy :) I am going to try it very soon

  8. OMG Amy! I’ve never seen mitered corners done this way but now I certainly have to try it! Thank-you for this tut!! I’m seriously excited about your mitered corners!

  9. Thanks I have always wanted to learn how to do that. I have bookmarked it. I look forward to giving it a try.

  10. Thanks for the tutorial! I am going to have to try this. I have always wondered how to go about doing it.

  11. I have never seen this explained so clearly; on top of that, you did a great job with the step-by-step photos and instructions. Congratulations!

  12. Fabulous, Babe!!! great photography; I think I could actually follow your directions if my head was tracking properly…it’s full of oil painting right now and EASTER!!!!Love, hugs and kisses, Mom

  13. Great job with the tutorial, Amy. I love the look of mitred corners, but I’m always scared to try. :) You have given me confidence.

  14. Thanks for the great tutorial. That sure is so much easier than the way I have been doing mitered corners!
    Have a nice day!

  15. I don't ever miter my corners because I've never really known how! So thanks for this tutorial! I hope you don't mind if I share a link to this tutorial on sewwhattoday.blogspot.com on March 4!

  16. That is brilliant, thank you so much. This is like a gillion times easier than the last mitered corner project I did. Thank you thank you!

  17. I love the tutorial on mitered corners. Will give it try and let you know how it comes out. Thanks for the tutorials.
    Thanks Sharon

  18. This is the easiest way to do mitered corners I have done and I have tried many. I use the formula of “Measure the length of your square plus the width of your boarder doubled”.

  19. Great tutorial. I now will conquer the dreaded mitred corner. Your pdf of instructions will not print. Would like to have a print out – easier to follow at the sewing machine. Thank you.

  20. excelente tutorial es muy bueno saber elaborar las costura perfectas por eso aprendo de las mejores, gracias por compartir saludos desde venezuela……..

  21. the trouble I have is keeping corners mitered while hemming border. Mitered corners look ‘so’ professional and I have so much trouble with them. I guess they’re so simple ; they’re hard.

  22. Many thanks for this great tutorial! Found it on pinterest and it will help me a lot in all my future sewing projects ;-)
    Have a fabulous week!

  23. formula for strip lengths is length of side plus 2 x width of strip plus 2x seam allowance. Eg IG block is 6″ and strip will be finished width 1 inch (I.e. 1 and 1/4 cut) then length is 6 + 2 + 1/2 = 8 1/2″

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