Full size snooker tables (or more correctly English Billiards tables) are generally considered to be 12' x 6', but the playing area is defined in the rules thus:
Dimensions
(a) The playing area within the cushion faces shall measure 11 ft 8½in x 5ft 10in (3569mm x 1778mm) with a tolerance on both dimensions of +/_ ½ in (+/_ 13mm).
Height
(b) The height of the table from the floor to the top of the cushion Rail shall be from 2ft9½in to 2ft 10½in (851mm to 876mm).
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The standard size of a professional snooker (billiards) table is nine feet by four and a half feet. These are the ones the professionals play on that you see on the television competing for money and prizes.
A full size snooker table is 12ft by 6ft. The size a room you would need would be about 20ft by 15ft. So you can have about 4ft round the edge.