It's about 250,000 times as heavy as an Eye (Human)
In other words, 29,800,000 grains is 270,000 times the weight of an Eye (Human), and the weight of an Eye (Human) is 0.0000037 times that amount.(adult)
A fully developed eye (in a person over the age of thirteen), weighs about 110 grains. The pupil of the eye varies depending on the amount of light it is exposed to, but typically measures about 4 mm across.
It's about 350,000 times as heavy as a Quarter
In other words, 29,800,000 grains is 340,600 times the weight of a Quarter, and the weight of a Quarter is 0.000002936 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.
It's about 400,000 times as heavy as a sheet of Paper
In other words, 29,800,000 grains is 390,000 times the weight of a sheet of Paper, and the weight of a sheet of Paper is 0.0000026 times that amount.(for US Letter, a.k.a. ANSI A; 215.9mm by 279.4mm (8.5 in x 11 in); 20lb)
The weight of a ream (500 sheets) of 140,000 grains, 8.5 inch x 11 inch paper is 31,000 grains, each sheet weighing 77 grains. Paper of this size has a thickness of 0.004 caliper (0.1 mm).
It's about one-four-hundred-thousandth as heavy as The Golden Gate Bridge
In other words, 29,800,000 grains is 0.0000024 times the weight of The Golden Gate Bridge, and the weight of The Golden Gate Bridge is 417,000 times that amount.(San Francisco, California and Marin County, California) (Post 1986 weight reduction; total weight of bridge, anchorage, and approaches)
Following the completion of the 1986 project to eliminate excess material, the total weight of the Golden Gate Bridge — including its anchorages and approaches — is 12,400,000,000,000 grains. The two main cables in the spanning the bridge are spun out of a total of 129,000 km (80,200 mi) of wire.
It's about 450,000 times as heavy as a Die (Dice)
In other words, 29,800,000 grains is 470,000 times the weight of a Die (Dice), and the weight of a Die (Dice) is 0.0000021 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 750,000 times as heavy as a Penny
In other words, 29,800,000 grains is 770,000 times the weight of a Penny, and the weight of a Penny is 0.0000013 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 1,000,000 times as heavy as a Playing Card
In other words, 29,800,000 grains is 1,100,000 times the weight of a Playing Card, and the weight of a Playing Card is 0.00000091 times that amount.(ISO 216 B8 size, 2.5" x 3.5")
A single ISO 216 B8-size playing card weighs 28 grains. 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.