It's about as big as a Hot Air Balloon
It's about nine-tenths as big as an Olympic Swimming Pool
In other words, 150,000,000 tablespoons is 0.890 times the size of an Olympic Swimming Pool, and the size of an Olympic Swimming Pool is 1.10 times that amount.(FINA regulation; (minimum capacity)
According to the Fédération Internationale de Natation (FINA), a swimming pool for Olympic and world championship events must measure 50 m by 25 m with a depth of at least 2 m for a total volume of 170,000,000 tablespoons. A pool of this size was to be used in Olympic time trials in New Jersey in early 2008, but its component pieces were stolen from a warehouse, likely to be sold for scrap metal.
It's about two-fifths as big as The Goodyear Blimp
In other words, 150,000,000 tablespoons is 0.3860 times the size of The Goodyear Blimp, and the size of The Goodyear Blimp is 2.590 times that amount.(for GZ-20A)
The Goodyear GZ-20 model Blimp measures 388,000,000 tablespoons in total volume. A December, 1929 college football game between the University of Florida Gators and the University of Oregon Webfoots (later the University of Oregon Ducks) began with the blimp dropping a parachute-equipped ball from a height of 61 m (200 ft) to the field below.
It's about one-tenth as big as The Lincoln Memorial Reflecting Pool
In other words, 150,000,000 tablespoons is 0.0866 times the size of The Lincoln Memorial Reflecting Pool, and the size of The Lincoln Memorial Reflecting Pool is 11.50 times that amount.(Washington, D.C.)
The Lincoln Memorial Reflecting Pool holds approximately 1,720,000,000 tablespoons of water. The Pool has a sloping bottom and extends to 80 cm (30 in) deep in its center.
It's about one-fifteenth as big as The Capitol Rotunda (US)
In other words, the size of The Capitol Rotunda (US) is 17 times 150,000,000 tablespoons.(formally United States Capitol rotunda) (Washington, D. C.) (total chamber volume)
The Capitol rotunda measures 2,500,000,000 tablespoons in total volume. Beneath the Capitol lies a crypt that was built to hold the remains of President George Washington, but according to his wishes, Washington was entered at his family home and the crypt remains empty.
It's about one-thirtieth as big as Spaceship Earth (EPCOT Center)
In other words, the size of Spaceship Earth (EPCOT Center) is 28 times 150,000,000 tablespoons.(a.k.a. EPCOT Center) (Walt Disney World Resort, Lake Buena Vista and Bay Lake, Florida) (total structure volume)
Spaceship Earth, the iconic structure at the heart of Walt Disney World Resort's Epcot (formerly EPCOT Center), has a total volume of 4,200,000,000 tablespoons. The outer structure of the sphere features a gutter system that channels all rainwater into nearby World Showcase Lagoon instead of simply falling off the surface of the sphere.
It's about one-fortieth as big as Royal Albert Hall
In other words, 150,000,000 tablespoons is 0.0256 times the size of Royal Albert Hall, and the size of Royal Albert Hall is 39.06 times that amount.(a.k.a. Royal Albert Hall of Arts and Sciences) (Westminster, London, England, United Kingdom) (total auditorium volume)
Royal Albert Hall measures 5,860,000,000 tablespoons in total auditorium volume. One of the centerpieces of the Hall is the Grand Organ — the second-largest organ in the United Kingdom, with 10,268 speaking pipes reaching up to 9.8 m (32 ft) in height.