You likely want a fitted cover so sew a cover 1-2" smaller than the pillow insert. So for a 30x30" insert generally you'd want to sew a 28x28" cover. To test the fit just pin the fabric around the cushion until it looks right then measure the fabric.
Add 1/2" (or more if your fabric frays easily) seam allowances to all seams for 29x29" square. Square corners aren't filled out by the pillow insert so round them off, either trace around a bowl before sewing or eyeball it when sewing.
Adding an invisible zipper along one edge is a good idea. You'll need to increase the seam allowance where you be add the zipper. Alternately you can overlap the fabric on the back like an envelope to insert and remove the cushion.
Cushion Cover is a cover of sofa pillow which are different size of cushion cover, such as 14′’/14′’, 16′’/16′’, 18′’/18′’, 20′’/20′’ and so on.
The size of a standard pillow is 20" X 26". The size of a king size pillow is 20" X 28.
What is the biggest size, that a pillow pet you can get
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The standard size of a pillow case is 21"x30".
king size
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The pillow
The weight of any pillow will depend uponthe dimensionsthe materials used to make it (cover & stuffing)how tightly the pillow is stuffed.I have an 18cm (7") square, well-stuffed pillow that weighs 135g (4.8oz). A different pillow (26cm x 11cm) weighs 60g.
Generally, twin size pillow cases are 22" x 33".
12 inches
Any size you want it to be.