It's about one-and-one-tenth times as heavy as a Jelly Bean.
In other words, the weight of a Jelly Bean is 0.910 times 18 grains.(for Jelly Belly beans; approximate)
Made of sugar, corn syrup, and pectin, a single jelly bean weighs about 18 grains. President Ronald Reagan cited jelly beans as his favorite candy and 49,000,000 grains of the candies were served at his first inauguration in 1981.
It's about four-fifths as heavy as a Paper Clip.
In other words, 18 grains is 0.830 times the weight of a Paper Clip, and the weight of a Paper Clip is 1.20 times that amount.(average)
Notwithstanding the tremendous variation in sizes and materials, a typical paperclip weighs about 22 grains. 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-and-a-half times as heavy as a Nail.
It's about two-thirds as heavy as a Playing Card.
It's about half as heavy as a Penny.
In other words, 18 grains is 0.470 times the weight of a Penny, and the weight of a Penny is 2.10 times that amount.(United States) (formally one-cent coin) (Union shield design, 2010-present)
The weight of a United States penny is 39 grains. 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 three-tenths as heavy as a Die (Dice).
In other words, 18 grains is 0.280 times the weight of a Die (Dice), and the weight of a Die (Dice) is 3.60 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 63 grains. 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.
It's about one-fifth as heavy as a Quarter.
In other words, 18 grains is 0.20570 times the weight of a Quarter, and the weight of a Quarter is 4.8610 times that amount.(United States quarter-dollar coin) (a.k.a. Quarter dollar, a.k.a. America the Beautiful quarter, a.k.a. two bits)
The America the Beautiful series quarters, which began to enter circulation in 2017, weigh 87.50 grains each. In answer to the common riddle, there are 119 ridges around the edge of the coin in its current design.