It's about one-fifteen-thousandth as big as a Bathtub.
In other words, the size of a Bathtub is 17,000 times 15 pinches.(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 260,000 pinches. 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.
It's about one-eighty-thousandth as big as a Hot Tub.
In other words, 15 pinches is 0.00001290 times the size of a Hot Tub, and the size of a Hot Tub is 77,500 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 1,170,000 pinches of water. Modern hot tubs became popular outside of Japan starting in about 1940.
It's about 0.0000009 times as big as a Concrete Mixer Truck.
In other words, 15 pinches is 0.000000840 times the size of a Concrete Mixer Truck, and the size of a Concrete Mixer Truck is 1,200,000 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 18,000,000 pinches. 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 0.000000004 times as big as a Hot Air Balloon.
In other words, 15 pinches is 0.00000000420 times the size of a Hot Air Balloon, and the size of a Hot Air Balloon is 240,000,000 times that amount.(four-person capacity; envelope volume; average)
The average volume of a hot air balloon sufficient to lift four adults is 3,600,000,000 pinches. Typically made of nylon or dacron, a balloon envelope of this size typically weighs just 88 kg (190 lbs).
It's about 0.000000004 times as big as an Olympic Swimming Pool.
In other words, 15 pinches is 0.00000000370 times the size of an Olympic Swimming Pool, and the size of an Olympic Swimming Pool is 270,000,000 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 4,100,000,000 pinches. 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 0.000000002 times as big as The Goodyear Blimp.
In other words, 15 pinches is 0.000000001610 times the size of The Goodyear Blimp, and the size of The Goodyear Blimp is 621,000,000 times that amount.(for GZ-20A) The Goodyear GZ-20 model Blimp measures 9,320,000,000 pinches 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 0.0000000004 times as big as The Lincoln Memorial Reflecting Pool.
In other words, 15 pinches is 0.0000000003610 times the size of The Lincoln Memorial Reflecting Pool, and the size of The Lincoln Memorial Reflecting Pool is 2,770,000,000 times that amount.(Washington, D.C.)
The Lincoln Memorial Reflecting Pool holds approximately 41,400,000,000 pinches of water. The Pool has a sloping bottom and extends to 80 cm (30 in) deep in its center.