
It's about as big as a Postit® Note (3M)
(3M) (generically sticky notes, a.k.a. repositionable notes, a.k.a. repositional notes)
A Postit® Note measures 5,400 square millimeters in total area. In September, 1989, Hurricane Hugo swept through Charleston, South Carolina with winds up to 230 kph (140 mph), uprooting eight oak trees in Mr. Bruce Brakefield's yard, but leaving in place a Postit® note attached to his front door.
It's about as big as a Playing Card
In other words, the size of a Playing Card is 1 times 5,544 square millimeters.
(ISO 216 B8 size)A single ISO 216 B8size playing card measures 5,600 square millimeters. Although this size is the most common playing card, many casinos use the smaller "bridge size" card — 2,604 sq. mm smaller.
It's about seven times as big as a Secure Digital (SD) card
In other words, 5,544 square millimeters is 7.20 times the size of a Secure Digital (SD) card, and the size of a Secure Digital (SD) card is 0.140 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 onetenth as big as an Apple iPad
In other words, 5,544 square millimeters is 0.13850 times the size of an Apple iPad, and the size of an Apple iPad is 7.220 times that amount.
(for 9.7 inch, Apple iPad Air MD785LL/B)An Apple iPad measures 23 cm (9.4 in) x 17 cm (6.6 in) for a total device area of 40,020 square millimeters. The base model iPad Air features 16 GB of storage capacity.
It's about ten times as big as a Postage Stamp
In other words, the size of a Postage Stamp is 0.10 times 5,544 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 USissued "Inverted Jenny" stamp printed in 1918, which features an upsidedown image of Curtiss JN4 ("Jenny") airplane; a single stamp sold for $977,500 at a 2007 auction.
It's about twelve times as big as a Quarter
In other words, 5,544 square millimeters is 11.990 times the size of a Quarter, and the size of a Quarter is 0.0834 times that amount.
(United States quarterdollar 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 fifteenandahalf times as big as a Nickel
In other words, 5,544 square millimeters is 15.690 times the size of a Nickel, and the size of a Nickel is 0.06373 times that amount.
(United States fivecent 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. 
