What Does Simmer Mean? Simmer is technically the heat that is just below the boiling point of the liquid. A simmer is reached within a pot on the stove when the liquid is hot and just has a bubble or two forming at a time and reaching the top of the liquid before popping.
Decide how much overhang you want from your tablecloth. For most purposes, an overhang or drop length of at least 6 inches (15cm) is appropriate. A shorter drop length may make the tablecloth look too small for the table.
If you know what size table you have and length of a drop you want, you can find out the tablecloth size you need by multiplying the drop length by 2, then adding the table width and length (if you want a non-uniform drop, you will have to individually calculate the widthwise and lengthwise drop lengths).