One tile is recommended to use 4 tile leveler spacers, 12''square tiles (Laying area approximately 75 sq.ft), 6''x 20''(Laying area approximately 62.5 sq.ft) and 12''x 24''(Laying area approximately 150 sq.ft.). If tile is large, it is recommended to use 6 spacers.
You could choose how many sets you want according to the size of your area.