It's about one-thirtieth as big as The Houston Astrodome
In other words, 2,500,000,000 tablespoons is 0.03 times the size of The Houston Astrodome, and the size of The Houston Astrodome is 32 times that amount.(a.k.a. Reliant Astrodome, a.k.a. Astrodome, a.k.a. Harris County Domed Stadium) (Houston, Texas)
The Reliant Astrodome measures 81,000,000,000 tablespoons in total volume. Until its renovation in 1988, Roy "The Judge" Hofheinz, the franchise owner of the Houston Colt .45s (later the Houston Astros) and one of the Astrodome's developers, had a private 966 sq. m (10,400 sq. ft) apartment in the facility.
It's about one-forty-fifth as big as The Melbourne Cricket Ground
In other words, 2,500,000,000 tablespoons is 0.02 times the size of The Melbourne Cricket Ground, and the size of The Melbourne Cricket Ground is 45 times that amount.(a.k.a. MCG, a.k.a. "The G") (Yarra Park, melbourne, Victoria, Australia) (internal volume)
The MCG has an internal volume of approximately 110,000,000,000 tablespoons. The first cricket game held on the site of the MCG was in 1853 when the Melbourne Cricket Club was granted permission to a roughly 0.04 sq. km (10-acre) area to be used "for cricket and no other purpose."
It's about one-sixty-fifth as big as The Great Pyramid of Giza
In other words, 2,500,000,000 tablespoons is 0.0152277 times the size of The Great Pyramid of Giza, and the size of The Great Pyramid of Giza is 65.66993 times that amount.(a.k.a. Pyramid of Khufu, a.k.a. Pyramid of Cheops) (Cairo, Egypt) (including internal hillock)
The Great Pyramid of Giza has an estimated volume of 164,174,800,000 tablespoons including its internal hillock. The 2,300,000 stones used in the construction of the pyramid weighed an average 2.27 metric tons (2.06 short tons) and were quarried at distances of up to 805 km (500 mi) away.
It's about 3,500 times as big as a Concrete Mixer Truck
In other words, 2,500,000,000 tablespoons is 3,400 times the size of a Concrete Mixer Truck, and the size of a Concrete Mixer Truck is 0.0003 times that amount.(a.k.a. cement mixer, a.k.a. cement mixer truck, a.k.a. cement transport truck, a.k.a. concrete mixer, a.k.a. concrete transport truck, a.k.a. in-transit mixer)(standard size; drum capacity)
A concrete mixer truck has a drum volume of up to 740,000 tablespoons. Concrete mixer trucks can be in transit for about 90 minutes before the concrete dries — if the concrete dries while in the drum, jackhammers or even dynamite must be used to remove it.
It's about one-fifteen-thousandth as big as Sydney Harbour
In other words, 2,500,000,000 tablespoons is 0.0000658 times the size of Sydney Harbour, and the size of Sydney Harbour is 15,200 times that amount.(formally Port Jackson, a.k.a. Sydney Harbor) (Sydney, New South Wales, Australia) (total estuary water volume at high tide)
Lending the term "sydharb" or "sydarb" to comparable quantities of water, Sydney Harbor contains approximately 38,000,000,000,000 tablespoons of water. Snapper Island, a onetime naval facility loocated in the Harbour, was transformed by the dredging efforts of the Australian Navy from a 2,360 sq. m (25,400 sq. ft) outcropping to a 16,500 sq. m (178,000 sq. ft) island shaped roughly in the outline of a boat.
It's about 50,000 times as big as a Hot Tub
In other words, 2,500,000,000 tablespoons is 51,400 times the size of a Hot Tub, and the size of a Hot Tub is 0.0000195 times that amount.(for Lifesmart Rock Solid Simplicity Plug and Play 4 Person Spa With 12 Jets) (a.k.a. Spa, a.k.a. Jacuzzi, a.k.a. Whirlpool) (Advertised Capacity)
An average, four-person hot tub holds 48,600 tablespoons of water. Modern hot tubs became popular outside of Japan starting in about 1940.
It's about 250,000 times as big as a Bathtub
In other words, 2,500,000,000 tablespoons is 230,000 times the size of a Bathtub, and the size of a Bathtub is 0.0000043 times that amount.(a.k.a. bath, a.k.a. tub) (for Bootz Industries Aloha 5 ft. Left Hand Drain Soaking Tub)
The capacity of a typical bathtub is 11,000 tablespoons. Historically, bathtubs have been made of various materials including marble, terracotta, silver, gold, and iron but the size and shape of the tubs has changed little in their 7,000 year history.