We build our tables down to the inch which means you can specify your exact specs. It is HIGHLY recommended to lay out and measure your space for exact and accurate table dimensions. Using sheets, blankets, cardboard, etc. is very beneficial for a visual representation.
There are standard sizes that allow for the typical number of people, usually 24 inches per person. Therefore, 6 feet sits 3 per side, 8 feet sits 4 per side, etc. The average width of a table is 40-46 inches, giving ample room for those seated at the table. A narrow table would be around 36 inches and a wider table ranges around 48+ inches. To seat two people at the head of the table, 50-60 inches is appropriate. Here is an example of the same table style but in different sizes to give some visual representation.