If you're referring to an English Billiards table (ie the table they also play snooker on), then the Rules define the measurements 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).
Generally referred to as 12' x 6'
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