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Step 1: What kind of measurement do you want to compare?
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Length
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Weight
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Speed
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Time
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Area
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Amount




Equivalents in other units


How big is 12 fluid ounces?

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It's about one-and-one-tenth times as big as a Baseball (packed).
In other words, 12 fluid ounces is 1.0796207 times the size of a Baseball (packed), and the size of a Baseball (packed) is 0.92625123 times that amount.
(64% packing density) (MLB rules)
It's about seven-tenths as big as a Blood Donation.
In other words, the size of a Blood Donation is 1 times 12 fluid ounces.
(American Red Cross donation volume)
The typical donation amount when giving blood is about 20 fluid ounces. Donated quantities of blood typically have a viable shelf life of about 42 days.
It's about three-fifths as big as a STARBUCKS Venti Coffee.
In other words, the size of a STARBUCKS Venti Coffee is 1.7 times 12 fluid ounces.
It's about one-and-seven-tenths times as big as a Baseball.
In other words, 12 fluid ounces is 1.686907279 times the size of a Baseball, and the size of a Baseball is 0.5928008092 times that amount.
(MLB rules)
Per Major League Baseball rules, a baseball must measure between about 6.821415793 fluid ounces and 7.40580363 fluid ounces. A major league pitcher can throw a baseball at up to 150 kph (91 mph) in a fastball pitch.
It's about two-and-a-half times as big as a Tennis Ball.
In other words, 12 fluid ounces is 2.253 times the size of a Tennis Ball, and the size of a Tennis Ball is 0.4439 times that amount.
(ITF Standard; for Type 2 ball)
It's about three times as big as a Puck (Hockey).
In other words, 12 fluid ounces is 3.063732655 times the size of a Puck (Hockey), and the size of a Puck (Hockey) is 0.3263992367 times that amount.
(Ice hockey)
It's about one-fifth as big as an Ostrich Egg.
In other words, 12 fluid ounces is 0.2175 times the size of an Ostrich Egg, and the size of an Ostrich Egg is 4.598 times that amount.
(Struthio camelus) (for common ostrich; average)