Note: Fractions may not be view-able if using a mobile device.
Click here to download the Small Round Bag Pattern (pdf).
Print in portrait mode, and verify the 1" square on the printed copy is truly 1".
Tips for sewing round bottoms into bags:
- Mark your seam allowance on the circle with a pencil so that you can verify that you aren't deviating off course.
- Mark the quarters of your bag and the side of your bag, and then check to make sure those marks line up when you are sewing.
- Use a magnetic seam guide, or mark the needle plate of your sewing machine with a piece of tape, to help see the seam allowance when you are sewing.
- When at the sewing machine, place the side of the bag on the bottom (against the feed dogs) with the right side facing up. Place the circle with right-side facing down.
- When sewing, hold the with your right hand. Use your left hand to ease the circle so that the edges of both pieces of fabric line up at the seam allowance. Hold the circle at least 1/2” in from the edge to prevent bias stretching.
- Stop sewing with your needle in the down position, lift your foot, and ease the fabric when needed to keep circle stitching smooth and to prevent puckering.
- You could also use pins to hold the side of your bag to your circle on the quarters or eights.
Do the math:
π = 3.14159….
D = Finished Circle Diameter
S = Seam Allowance
C = Cut fabric circle = D + (S x 2)
L= Cut length of the side of the bag = (D x π) + (S x 2)
Common Bag Sizes:
(In inches, all seam allowances are 1/2" inch).
| D | C | L |
| Finished Bag Size | Cut Fabric Circle | Cut Length of Side of Bag |
| 4 | 5 | 13 9/16 |
| 4.5 | 5.5 | 15 2/16 |
| 5 | 6 | 16 11/16 |
| 5.5 | 6.5 | 18 4/16 |
| 6 | 7 | 19 14/16 |
| 6.5 | 7.5 | 21 7/16 |
| 7 | 8 | 23 |
| 7.5 | 8.5 | 24 9/16 |
| 8 | 9 | 26 2/16 |
| 8.5 | 9.5 | 27 11/16 |
| 9 | 10 | 29 4/16 |
| 9.5 | 10.5 | 30 14/16 |
| 10 | 11 | 32 7/16 |
| 10.5 | 11.5 | 34 |
| 11 | 12 | 35 9/16 |
| 11.5 | 12.5 | 37 2/16 |
| 12 | 13 | 38 11/16 |
| 13 | 14 | 41 13/16 |
| 14 | 15 | 45 |
| 15 | 16 | 48 2/16 |
| 16 | 17 | 51 4/16 |
| 17 | 18 | 54 7/16 |
| 18 | 19 | 57 9/16 |
| 19 | 20 | 60 11/16 |
| 20 | 21 | 63 13/16 |
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This blog has been a tremendous help for my bagmaking. I love the circle calculator! Now I’m hoping to branch out to ovals. I found a site that does the math for me, But I don’t know how to figure in the seam allowances.
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This was so incredibly helpful. I've been making Yoga bags and had switched to a box bottom because I could not get the size for the circle to work out properly. You have made it so easy and the one I just did is perfect. Thankyou!!!
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I have a question about this pattern and calculations. Following the instructions with half inch seam allowance, my circle is always too big. As the chart says we are to add one inch to our circle for ‘both sides’. But say a 6 inch diameter, why not use the 6.5 inch instead of the 6. (This worked for me) but still using the 19 14/16 length of bag. The printout is great though I am either missing something or the numbers are wrong (which I question for certainly I wouldn’t be the first to notice this AND you really ‘seam’ to know what your talking about.). Are we supposed to do one inch seam on the circle when sewing?
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Do you have calculations for making a box tote I've been trying to figure out the formula for this for years Thanks.
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Wow this is exactly what I need to make a round cover for my metal water bottle! Thank you so much, I have been guessing, and not doing such a great job.
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