How to Calculate the Corner Triangle Size for Quilt Blocks
Quilt blocks can be set into a quilt in two different ways: straight set and on point. Straight set is just like it sounds, running across and up and down like a grid. With blocks on point you turn the blocks so that the corners are at the top, bottom and sides. This can give a plain block an entirely new look, adding interest to your quilt design. In order to square off your quilt top with blocks on point, you have to add triangles in the corner to fill in the empty spaces. Figuring out the exact size of the needed triangle requires a small bit of calculation.
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Things You'll Need
- Quilt top
- Measuring tape
- Calculator
- Cotton quilt fabric
- Rotary cutter
- Rotary mat
- Rotary ruler
Instructions
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1
Measure the finished size of your quilt block. Don't include the seam allowance. Measure three blocks, add the figures together and divide the result by three. This will give you an average size in case the blocks are not exact.
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2
Divide the finished size of your blocks by 1.414. Round up the results to the nearest eighth-inch.
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3
Add 7/8-inch to the rounded number. This final number is the size of square you need to cut.
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4
Cut a square of fabric the final size you calculated. Use the measurements on the rotary mat for accurate sizing.
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5
Cut the square in half diagonally. You will have two triangles. Each triangle is the exact size you need to square off your on-point blocks.
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References
- Photo Credit Steve Baccon/Photodisc/Getty Images
