To determine the dimensions of your tablecloth
Width = width of table + 2(drop) +2(hem) — my example: 40 + 2(11.5) + 2(.5) = 64″
Length = length of table + 2(drop) + 2(hem) — my example: 80 + 2(11.5) + 2(.5) = 104″
In photos at the bottom, you can see that I calculated my drop so the tablecloth will fall to the top of the chair cushions.
If the width of the fabric is enough
If you’re making a tablecloth for a narrow table and the width of the fabric as it comes is sufficient, then, lucky day!, you can simply cut the fabric to the necessary size and hem it as shown below.
If you need extra width – matching patterns
Most home dec fabric is around 55″ wide, so you may very well need more fabric to cover the width of your table. You’ll achieve this by sewing side panels of fabric to either side of your main panel, but you’ll want to match the print on the fabric so that it appears to be one continuous piece and isn’t interrupted by an obvious seam. You’ll need extra lengths of fabric. To determine your yardage for a project like this, please see this tutorial.