How to Calculate Quilt Block Sizes

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Unless you are using a quilting pattern supplied to you from an outside source, you will need to know how to calculate the size of a completed quilt block. Furthermore, by understanding this process, you can plan quilt blocks of your own design to be a certain size by using the same calculation principles in reverse. This process calculates the size of a completed quilt block. It assumes that you are using a 1/4-inch seam allowance, which is most common in quilting.

Things You'll Need

  • Quilt block pieces
  • Seam gauge (ruler)
  • Paper
  • Pencil
  • Calculator
  • Lay out the quilt block pieces as they will fit together when completed. Make sure all the edges touch but don't overlap.

  • Measure the width of the entire loose block. Record this number as your raw width.

  • Count the number of quilt pieces used in the width and figure ½ inch for each piece. This is the total seam allowance on both the right and left sides of the quilt piece. Record this number as your width seam allowance.

  • Subtract the width seam allowance from the raw width. This new number is the completed width for your quilt block.

  • Repeat this process for the height.

References

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