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How big is 304 square millimeters?

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It's about one-and-one-tenth times as big as a Penny.
In other words, 304 square millimeters is 1.07 times the size of a Penny, and the size of a Penny is 0.935 times that amount.
(United States one-cent coin) (a.k.a. Lincoln penny, a.k.a. Cent, a.k.a. One cent piece)
The Lincoln penny, in its current design since 1909, has a diameter of 19.05 mm (0.75 in) and an area of 285.0 sq. mm.
It's about nine-tenths as big as a Nickel.
In other words, 304 square millimeters is 0.8605 times the size of a Nickel, and the size of a Nickel is 1.162 times that amount.
(United States five-cent coin) (a.k.a. Jefferson nickel)
The nickel, in its current design since 1938, has a diameter of 21.21 mm (0.835 in) and an area of 353.3 sq. mm.
It's about one-and-one-fifth times as big as a Dime.
In other words, 304 square millimeters is 1.207 times the size of a Dime, and the size of a Dime is 0.8285 times that amount.
(United States ten-cent coin) (a.k.a. Roosevelt dime)
The dime, in its current design since 1946, has a diameter of 17.91 mm (0.705 in) and an area of 251.9 sq. mm.
It's about four-fifths as big as a Postage Stamp.
In other words, the size of a Postage Stamp is 1 times 304 square millimeters.
(average; United States dimensions)
A typical postage stamp measures an average of 400 sq. mm. One of the most prized stamps among collectors is the US-issued "Inverted Jenny" stamp printed in 1918, which features an upside-down image of Curtiss JN-4 ("Jenny") airplane; a single stamp sold for $977,500 at a 2007 auction.
It's about two-thirds as big as a Quarter.
In other words, 304 square millimeters is 0.6577 times the size of a Quarter, and the size of a Quarter is 1.52 times that amount.
(United States quarter-dollar coin) (a.k.a. Quarter dollar, a.k.a. Washington quarter, a.k.a. two bits)
The George Washington quarter, in circulation in various forms since 1932, has a diameter of 24.26 mm (0.955 in) and an area of 462.2 sq. mm.
It's about two-fifths as big as a Secure Digital (SD) card.
In other words, 304 square millimeters is 0.39 times the size of a Secure Digital (SD) card, and the size of a Secure Digital (SD) card is 2.6 times that amount.
A Secure Digital (SD) card measures 3.2 cm by 2.4 cm for a total area of 770 square millimeters. SDXC Cards, the latest standard for the technology, will allow the cards to hold up to 2 terabytes of data.
It's about four times as big as a Nailhead.
In other words, 304 square millimeters is 3.91 times the size of a Nailhead, and the size of a Nailhead is 0.2558 times that amount.
(for 11-gauge wire nai)
An 11-gauge nailhead measures 77.74 square millimeters. Nails have been used since ancient times; archaeologists have discovered Ancient Egyptian nails that are over 5,000 years old.