It's about one-fifteen-thousandth as heavy as a Dachshund.
In other words, the weight of a Dachshund is 10,000 times 645.5 miligrams.(a.k.a. "Wiener dog", a.k.a. Teckel, a.k.a. Dackel, a.k.a. "hot dog dog", a.k.a. "sausage dog", a.k.a. "doxie") (FCI standard; standard size)
The Fédération Cynologique Internationale (FCI) calls for dachshunds to weigh about 9,000,000 miligrams. Despite of their small size, a 2008 survey conducted by the University of Pennsylvania named dachshunds as the most aggressive dog breed.
It's about one-twenty-thousandth as heavy as a Gold Bar.
In other words, 645.5 miligrams is 0.00005188326728 times the weight of a Gold Bar, and the weight of a Gold Bar is 19,274.03674 times that amount.(London Good Delivery bar)
A "London Good Delivery" gold bar — the variety commonly held by Central Banks — should weigh 12,441,390.72 miligrams. The largest gold bar ever produced was minted by Mitsubishi Materials Corporation (a sibling company of the auto manufacturer) in 2005 and weighed 250,000,000 miligrams.
It's about one-forty-five-thousandth as heavy as a Dalmatian.
In other words, the weight of a Dalmatian is 45,700 times 645.5 miligrams.(a.k.a. Dalmatinac, a.k.a. Carriage Dog, a.k.a. Spotted Coach Dog, a.k.a. Firehouse Dog) (FCI standard; male)
The Fédération Cynologique Internationale (FCI) calls for Dalmatians to weigh between 29,500,000 miligrams. The association of the breed with fire departments (and similarly with Budweiser Beer and its team of Clydesdales) stems from their affinity for horses, having been used historically as carriage dogs capable of guiding horse-drawn fire engines to the sites of blazes.
It's about one-seventy-thousandth as heavy as a Toilet.
In other words, 645.5 miligrams is 0.0000148 times the weight of a Toilet, and the weight of a Toilet is 67,600 times that amount.(KOHLER Round front sitting flush toilet, model #K-11471-0)
The weight of a typical round front sitting flush toilet is 43,600,000 miligrams. The Indian town of Musiri in Tamil Nadu state features the world's only paying toilet, which rewards its users up to 10¢ Indian (10 paisas) per visit and uses the waste for compost and fertilizer.
It's about one-seventy-five-thousandth as heavy as an Octopus.
In other words, the weight of an Octopus is 77,000 times 645.5 miligrams.(for Giant Pacific Octopus, Enteroctopus) (Adult, average)
The adult North Pacific Giant Octopus usually weighs around 50,000,000 miligrams. It is the largest octopus species and is known for its considerable intelligence, including the ability to open jars, solve mazes, and mimic other octopuses.
It's about one-one-hundred-fifty-thousandth as heavy as a Kangaroo.
It's about one-two-hundred-fifty-thousandth as heavy as a Panda Bear.
In other words, the weight of a Panda Bear is 230,000 times 645.5 miligrams.(a.k.a. Giant Panda, Ailuropoda melanoleuca)(Adult, male)
An adult, male Giant Panda weighs up to 150,000,000 miligrams. Despite having the digestive system of a carnivore, the panda eats only bamboo and must eat up to 6,400,000 miligrams of it per day to compensate for the limited energy the plant provides.