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How heavy is 645.5 miligrams?

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It's about 2,000 times as heavy as a Poppy Seed.
In other words, 645.5 miligrams is 2,200 times the weight of a Poppy Seed, and the weight of a Poppy Seed is 0.00045 times that amount.
(Papaver somniferum)
Fifty percent oil by weight, a poppy seed weighs approximately 0.3 mg. The true pigment of a poppy seed is brown in color, while the characteristic bluish color is an optical illusion caused by a layer of calcium oxalate crystals refracting light rays.
It's about one-three-thousand-five-hundredth as heavy as a Chihuahua.
In other words, 645.5 miligrams is 0.000287 times the weight of a Chihuahua, and the weight of a Chihuahua is 3,480 times that amount.
(a.k.a. Chihuahue(o) (FCI standard)
The F&d&ration Cynologique Internationale (FCI) calls for Chihuahuas to weigh about 2,250,000 miligrams. Relative to their body sizes, Chihuahuas have the largest brain size of any dog breed.
It's about one-four-thousand-five-hundredth as heavy as a Brick.
In other words, the weight of a Brick is 4,500 times 645.5 miligrams.
(Standard, traditional face brick - 1,900 cu. cm (120 cu. in))
A standard, traditional face brick weighs an average of 2,900,000 miligrams. The steeple of the Church of St. Martin in Landshut, Germany is said to be the tallest brick tower in the world at a height of 130.6 m (428.5 ft) and was constructed using an estimated 650,000 bricks.
It's about one-ten-thousandth as heavy as a Gallon of Paint.
In other words, the weight of a Gallon of Paint is 10,000 times 645.5 miligrams.
(excluding container; average weight)
A gallon of paint weighs about 5,000,000 miligrams. Every day, 10,000,000 L (3,000,000 gal) of paint are applied in the United States.
It's about one-ten-thousandth as heavy as a Cat.
In other words, the weight of a Cat is 10,000 times 645.5 miligrams.
(Felis catus) (Domestic; healthy weight)
The average domestic cat should weigh between 5,000,000 miligrams. Cats are known for their righting reflex, which allows them to land on their feet and survive falls from heights of 1 m (3 ft) up to about 21 m.
It's about one-ten-thousandth as heavy as a Bowling Ball.
In other words, 645.5 miligrams is 0.0000948722602 times the weight of a Bowling Ball, and the weight of a Bowling Ball is 10,540.4888 times that amount.
(most common selection among male bowlers)
With an allowable range of 4,989,516.07 miligrams, the most-preferred bowling ball weight among adult, male bowlers is 6,803,885.55 miligrams. Because regulation balls measure the same diameter irrespective of their weight, ball density varies by size and balls weighing less than about 5,000,000 miligrams will float in water.
It's about 10,000 times as heavy as a Grain of Salt.
In other words, 645.5 miligrams is 11,000 times the weight of a Grain of Salt, and the weight of a Grain of Salt is 0.0000909 times that amount.
The mass of a grain of salt is approximately 0.0585 mgs. Salt consumption varies widely by country; the people of the United States consume a combined total of about 2,730,000,000,000 miligrams of salt each year.