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Equivalents in other units

How heavy is 491 miligrams?

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It's about three-fifths as heavy as a Nail.
In other words, 491 miligrams is 0.62 times the weight of a Nail, and the weight of a Nail is 1.6 times that amount.
(for 15-gauge, 2-inch, finishing nails)
A two-inch finishing nail weighs 790 miligrams. Nails have been in use for more than 5,400 years and were ven used as a medium of exchange in ancient times.
It's about two times as heavy as a Raindrop.
In other words, the weight of a Raindrop is 0.5 times 491 miligrams.
(a.k.a. drop, a.k.a. droplet) (average)
The weight of a raindrop depends heavily on the type of weather, but averages about 200 mg. The familiar teardrop shape of a raindrop is actually an optical illusion, caused by the reflection of the light and the motion of the drop.
It's about half as heavy as a Jelly Bean.
In other words, 491 miligrams is 0.45 times the weight of a Jelly Bean, and the weight of a Jelly Bean is 2.2 times that amount.
(for Jelly Belly beans; approximate)
Made of sugar, corn syrup, and pectin, a single jelly bean weighs about 1,100 miligrams. President Ronald Reagan cited jelly beans as his favorite candy and 3,200,000,000 miligrams of the candies were served at his first inauguration in 1981.
It's about one-third as heavy as a Paper Clip.
In other words, the weight of a Paper Clip is 2.9 times 491 miligrams.
Notwithstanding the tremendous variation in sizes and materials, a typical paperclip weighs about 1,400 miligrams. The country of Norway has used the paper clip as something of a national symbol since the end of World War II based on the erroneous notion that the paperclip was invented by a Norwegian, Johan Vaaler. However, the paperclip had already been in existence for at least 30 years by the time of Vaaler patented his paperclip design.
It's about one-fourth as heavy as a Playing Card.
In other words, 491 miligrams is 0.27 times the weight of a Playing Card, and the weight of a Playing Card is 3.7 times that amount.
(ISO 216 B8 size, 2.5" x 3.5")
A single ISO 216 B8-size playing card weighs 1,800 miligrams. Although this size is the most common home playing card, many casinos use "bridge size" cards — 2,640 sq. mm (4.036 sq. in) smaller in area.
It's about one-fifth as heavy as a Penny.
In other words, the weight of a Penny is 5 times 491 miligrams.
(United States) (formally one-cent coin) (Union shield design, 2010-present)
The weight of a United States penny is 2,500 miligrams. According to a 2010 report by the United States Mint, the cost of manufacturing and distributing a penny is $0.0179 — more than its face-value.
It's about one-tenth as heavy as a Die (Dice).
In other words, 491 miligrams is 0.12 times the weight of a Die (Dice), and the weight of a Die (Dice) is 8.3 times that amount.
(for six-sided, 16 mm, rounded cube)
A die, of the size most commonly used in board games and casinos, typically weight 4,100 miligrams. The use of dice and dice-like tools predates written history, with the oldest known examples belonging to a 5,000-year old backgammon set uncovered during an archaeological dig in modern-day Iran.