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Cassie Cartmell – Faodail Creation
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How to Sew Bias Binding on Curved Seams is much easier than it may first appear. If you have ever looked at a circular coaster, placemat, or other curved sewing project and wondered how to neatly cover the raw edges, bias binding is the perfect solution.
Bias binding creates a neat, professional finish while completely hiding the raw fabric edges. Because true bias binding is cut diagonally across the fabric, it has enough flexibility to ease around curves without becoming bulky or difficult to sew.
In this bias binding tutorial, Iโll show you how to sew bias binding on curved seams using a circular coaster. This same technique can be used on many other sewing projects with curved edges.
You don’t need complicated equipment or advanced sewing skills. With some double-fold bias binding, a sewing machine, a few Wonder Clips and an iron, you can create a clean finish around your project.
Guide to Bias Binding on Curved Seams – What You Need

Before learning how to sew bias binding on curved seams, gather everything you need.
For this project, you will need:
- A circular coaster or other circular sewing project
- Double-fold bias binding tape
- Sewing machine
- Polyester sewing thread
- Bobbin thread
- 90/14 sewing machine needle
- Wonder Clips or sewing pins
- Fabric scissors
- Measuring tape or ruler
- Iron and ironing surface
I am using a Baby Lock Soprano sewing machine for this tutorial, but you can use your preferred sewing machine.
You don’t need a quarter-inch foot for this technique. Your regular sewing machine presser foot works perfectly well because the fold in the bias binding gives you a convenient stitching guide.
Choosing the Right Bias Binding – How to Sew Bias Binding on Curved Seams
When learning how to sew bias binding on curved seams, choosing the right binding makes the process much easier.
For this project, I recommend using double-fold bias binding tape. You can purchase it ready-made from many fabric stores and larger retailers.
Double-fold bias binding comes already pressed with folds that make it easier to position around your project.
It is important to understand that bias binding and regular quilt binding are not necessarily the same thing.
True bias binding is cut diagonally across the fabric grain. Cutting the fabric on the bias gives the binding additional flexibility, which is particularly useful when you’re working around curves.
Regular quilt binding can be cut along the straight grain, depending on the project. However, when you’re working with circular or heavily curved edges, bias binding is particularly useful because it can ease around the curve.
How to Sew Bias Binding on Curved Seams: Understanding the Folds

Before you begin sewing, take a moment to look closely at your double-fold bias binding.
When you remove the binding from the package, it will already be folded.
Open the binding out once.
You should be able to see two pressed fold lines.
For how to sew bias binding on curved seams, the first fold is the important one when attaching the binding to the raw edge.
The centre fold will eventually become the outer edge of your finished project.
Think of the process as attaching the binding first and then folding it over the raw edge.
The first fold acts as your sewing guide.
Once the first side has been stitched, the binding can be folded over the edge of your coaster. The centre fold will sit neatly along the finished edge.
You can then hand stitch or machine stitch the folded binding into place on the back.
I personally like to hand stitch the back of the binding because it gives me a very neat finish, but you can certainly machine stitch it if you prefer.
Positioning the Bias Binding – How to Sew Bias Binding on Curved Seams
Place your circular coaster in front of you.
Take the opened bias binding and position the first fold directly beside the raw edge of the coaster.
The raw edge of your coaster should sit neatly against the appropriate fold.
This is one of the most important parts of how to sew bias binding on curved seams because accurate positioning will make the rest of the process much easier.
Use Wonder Clips to hold the binding in position.
You don’t need to clip the entire project before you begin sewing.
Instead, clip several inches of binding around the coaster so you can start sewing comfortably.
How to Sew Bias Binding on Curved Seams: Where to Start

One of the biggest mistakes you can make when attaching binding to a circular project is starting right at the beginning of the binding.
Don’t do this.
Instead, leave approximately five inches of the binding unstitched at the beginning.
This gap is extremely important because you need room to join the two ends of the binding together when you reach the end of your circular project.
If you stitch all the way back to the beginning, you can make joining the ends much more difficult.
Leaving several inches gives you enough working space to accurately measure, cut and join the binding.
This simple tip makes how to sew bias binding on curved seams much easier and gives your finished project a much more professional appearance.
Set Up Your Sewing Machine – How to Sew Bias Binding on Curved Seams
Thread your sewing machine with your preferred polyester sewing thread.
For this example, I am using white thread and a white bobbin.
A 90/14 sewing machine needle is also suitable for this project.
Keep your regular presser foot attached.
You do not need to use a quarter-inch foot because the fold in the bias binding provides a natural stitching guide.
Set up your machine so you can comfortably see the fold line as you sew.
A Simple Sewing Guide – How to Sew Bias Binding on Curved Seams
The pressed fold in the bias binding is your guide.
Instead of trying to measure the seam allowance repeatedly while sewing, simply follow the existing fold line.
This is one of the reasons double-fold bias binding is so convenient for beginners.
If you are new to how to sew bias binding on curved seams, don’t worry about trying to make everything perfect before you begin.
The most important thing is keeping the binding aligned with the raw edge and following the fold consistently.
How to Sew Bias Binding on Curved Seams: Sewing the First Side

Place your coaster underneath the presser foot.
Remember that you are starting several inches away from the beginning of the bias binding.
Lower the presser foot and begin sewing.
Take a few backstitches at the beginning to secure your stitching.
Now slowly sew around the entire curved edge.
As you sew, keep the bias binding positioned directly along the raw edge of your coaster.
The bias binding has some flexibility, which allows it to ease around the circular shape.
You do not need to stretch it aggressively.
Instead, allow the binding to naturally follow the curve.
This is an important part of how to sew bias binding on curved seams. If you pull the binding too tightly, the edge can become distorted or wavy.
Take Your Time Around the Curve – How to Sew Bias Binding on Curved Seams

When sewing around a circle, slow and steady is best.
You don’t need to rush.
Keep your eye on the edge of the coaster and the fold line of the binding.
Make small adjustments as you sew.
If necessary, stop with your needle down, lift the presser foot and gently reposition the binding.
Then lower the presser foot and continue sewing.
Because the binding is cut on the bias, it can ease around the curve much more easily than straight-cut fabric strips.
Joining the Two Ends – How to Sew Bias Binding on Curved Seams
Eventually, you will come back around to the starting point.
Do not sew directly into the first stitches.
You should still have two unstitched sections of bias binding.
This is intentional.
The next step is joining those two ends together.
Bring the two ends together and determine where they need to meet.
You want the ends to overlap by approximately one-quarter inch.
The two quarter-inch sections will give you the total amount of binding needed for the seam.
Use a ruler to measure the overlap and mark the area if necessary.
Then trim the excess binding.
Don’t worry if this sounds complicated. Once you’ve done it once, you’ll find that how to sew bias binding on curved seams becomes much more straightforward.
Sew the Binding Ends Together – How to Sew Bias Binding on Curved Seams
Open the two ends of the bias binding.
Place them right sides together.
The folded edges should line up with each other.
Pin or clip the pieces together if necessary.
Now sew across the join using a quarter-inch seam allowance.
Take your time with this step because an accurate seam will help the finished binding lie smoothly around your coaster.
Once you have sewn the seam, trim any excess if required.
Press the seam open.
You should now have one continuous piece of bias binding attached around the entire circular edge.
How to Sew Bias Binding on Curved Seams: Complete the First Stitching

Once the two ends have been joined, return to your sewing machine.
Continue sewing along the remaining section of the binding.
Follow the same fold line you used previously.
Stitch until you meet the stitching you made at the beginning.
Take a few backstitches to secure the seam.
At this point, the bias binding should be attached around the entire circular edge.
You have now completed the first major stage of how to sew bias binding on curved seams.
The remaining step is simply folding the binding over the raw edge and securing it.
Folding the Bias Binding Over the Edge – How to Sew Bias Binding on Curved Seams
Now turn your attention to the centre fold of the bias binding.
This centre fold is going to become the finished outside edge of your coaster.
Fold the bias binding over the raw edge of the coaster.
The centre fold should sit neatly along the edge.
Work your way around the circle.
You may notice that the binding does not immediately lie perfectly flat.
Don’t worry.
This is completely normal.
Because you have just eased the binding around a curved edge, it may need a little encouragement to settle into position.
Pressing Makes a Big Difference – How to Sew Bias Binding on Curved Seams
An iron is your best friend when learning how to sew bias binding on curved seams.
Set your iron to an appropriate temperature for the fabric you are using.
Gently press the bias binding into position.
Work around the circle a section at a time.
Don’t drag the iron aggressively around the edge.
Instead, press the binding down and allow the fabric to relax into its new shape.
You should see the binding become much flatter and neater.
If there are small areas that need adjusting, reposition them and press again.
How to Sew Bias Binding on Curved Seams: Finishing the Back

Once the binding has been pressed into position, you need to secure the folded edge.
You have two choices.
You can hand stitch the binding on the back, or you can machine stitch it.
For a particularly neat finish, hand stitching is a great option.
Use small, neat stitches and work your way around the back of the coaster.
Try to catch the binding without allowing your stitches to become too visible on the front.
If you prefer to machine stitch, use a suitable stitch length and carefully follow the edge of the binding.
The choice is completely yours.
Check the Finished Edge – How to Sew Bias Binding on Curved Seams
Turn your coaster over and inspect the front.
The raw edge should now be completely enclosed by the bias binding.
The binding should follow the circular shape smoothly.
There should be no exposed raw seams.
If you notice an area that isn’t sitting flat, don’t panic.
Simply press the area again.
A little steam and careful pressing can make a significant difference to the finished appearance.
Common Mistakes When Sewing Bias Binding – How to Sew Bias Binding on Curved Seams

If you are learning how to sew bias binding on curved seams, there are a few common problems to watch for.
Starting too close to the beginning: Always leave enough binding free so you can join the ends.
Stretching the binding: Let the bias binding follow the curve naturally rather than pulling it tightly.
Sewing too close to the edge: Use the existing fold as your guide.
Skipping the pressing step: Pressing helps the binding settle around the curve and creates a professional finish.
Trying to sew too quickly: Slow down when approaching tight curves.
Not leaving enough binding for the join: Make sure you have enough extra binding at the beginning and end to comfortably join the two sections.
Why Bias Binding Is Perfect for Circular Projects – How to Sew Bias Binding on Curved Seams
Once you understand how to sew bias binding on curved seams, you can use the same technique for many different sewing projects.
Try using bias binding on:
- Circular placemats
- Coasters
- Round pot holders
- Fabric baskets
- Curved pockets
- Clothing edges
- Necklines
- Armholes
- Baby bibs
- Decorative fabric projects
The flexibility of bias binding makes it particularly useful whenever you need to finish a curved edge.
It can also add a decorative element to a project if you choose a contrasting fabric or colour.
How to Sew Bias Binding on Curved Seams – Final Tips

The first time you try bias binding, it may feel slightly awkward.
That is completely normal.
Like many sewing techniques, how to sew bias binding on curved seams becomes much easier with practice.
Start with a simple circular project such as a coaster.
It is small enough that you can concentrate on the technique without becoming overwhelmed.
Remember these key points:
- Use double-fold bias binding.
- Open the binding before positioning it.
- Use the first fold as your sewing guide.
- Leave approximately five inches unstitched at the beginning.
- Slowly sew around the curved edge.
- Leave a gap when you return to the beginning.
- Join the two ends with a quarter-inch seam.
- Complete the stitching around the coaster.
- Fold the binding over the raw edge.
- Press the binding carefully.
- Hand stitch or machine stitch the back.
- Give the finished project one final press.
The more you practice, the more comfortable you will become with curved edges.
Conclusion – How to Sew Bias Binding on Curved Seams
Learning how to sew bias binding on curved seams is a useful sewing skill that can be applied to many different projects.
A circular coaster is a great place to start because it allows you to practice easing the bias binding around a curve, joining the ends and creating a neat finished edge.
You don’t need expensive equipment or complicated techniques.
The most important things are taking your time, using the fold in the bias binding as your guide and remembering to leave enough binding at the beginning and end to join the two sections.
Once you are comfortable with the technique, try using bias binding on placemats, pot holders, clothing and other curved sewing projects.
I hope this tutorial has shown you that how to sew bias binding on curved seams doesn’t have to be difficult. With a little practice, you can create beautifully finished curved edges that look neat and professional.
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How to Sew Bias Binding on Curved Seams – The Ultimate Easy Guide
How to Sew Bias Binding on Curved Seams – The Ultimate Easy Guide is a fun way to explore quilting.
If you enjoyed How to Sew Bias Binding on Curved Seams – The Ultimate Easy Guide, you might also like How to Sew Self-Binding Placemats you can also try How to Sew a Rick Rack Quilt Binding to learn more quilting techniques.
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