The standard ping pong tables size as required by ITTF is 9 feet long X 5 feet wide X 2.5 feet tall. Of course, the net is then 6 feet long X 6 inches tall.
Here is a picture of the table tennis table sizes:
The table is 2.74 m (9.0 ft) long, 1.525 m (5.0 ft) wide, and 76 cm (2.5 ft) high with any constant material in as much as the table yields a same bob of around 23 cm (9.1 in) when a regulation size ball is dropped onto it from a height of 11.8 in, or around 77%. The table is consistently dull shade and matte, partitioned into two parts by a net at 15.25 cm (6.0 in) in tallness. The ITTF affirms just wooden tables or their derivates. Solid tables with a steel net or a strong solid segment are in some cases accessible in outside open spaces, for example, parks
ITTF could be changing the size of the regulation ping pong table in the future (APRIL FOOLS JOKE)
While this is the current size, the ITFF is considering a major change to the regulation sized table in 2018. Specifically, ITFF is looking to make the ping pong table size larger. They note as part of an initiative to continue the modernisation of table tennis, ITTF announces that as of Monday 1st January 2018 the table size regulations will be increasing to 6 meters long by 3.5 meters wide.
“One of our key goal is to increase the prize money at ITTF events and to do this we need a larger televised audience. At the moment one of our key tools, the table, does not support this goal in the best way.” – Dave Steintein, ITTF Equipment Public Relations Director
source: April fools joke by ITTF