If the division is not as neat substitute the closest Aida count you can get. Remember, if you are stitching from a kit, be careful what fabric you substitute so that you will not run out of floss.
Another tip - some patterns may include specialty stitches that are a bit more difficult to stitch on Aida, so watch out for that when trading linen for Aida.
For help with determining fabric sizes for projects, see the Cross Stitch Calculator.
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