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How big is 2,640 square millimeters?

It's about half as big as a Post-it® Note (3M)
The size of a Post-it® Note (3M) is about 5,400 square millimeters.
(3M) (generically sticky notes, a.k.a. repositionable notes, a.k.a. repositional notes)
A Post-it® 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 Post-it® note attached to his front door.
It's about half as big as a Playing Card
The size of a Playing Card is about 5,600 square millimeters.
(ISO 216 B8 size)
A single ISO 216 B8-size 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 three-and-a-half times as big as a Secure Digital (SD) card
The size of a Secure Digital (SD) card is about 770 square millimeters.
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 five-and-a-half times as big as a US Quarter
Flag of The US
The size of a US Quarter is about 462.20 square millimeters.
(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 seven times as big as a Postage Stamp
Flag of The US
The size of a Postage Stamp is about 400 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 seven-and-a-half times as big as a US Nickel
Flag of The US
The size of a US Nickel is about 353.30 square millimeters.
(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 nine-and-a-half times as big as a US Penny
Flag of The US
The size of a US Penny is about 285 square millimeters.
(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 ten-and-a-half times as big as a US Dime
Flag of The US
The size of a US Dime is about 251.90 square millimeters.
(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 one-fifteenth as big as an Apple iPad
The size of an Apple iPad is about 40,020 square millimeters.
(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 thirty times as big as a Nailhead
The size of a Nailhead is about 77.740 square millimeters.
(for 11-gauge wire nai)
An 11-gauge nailhead measures 77.740 square millimeters. Nails have been used since ancient times; archaeologists have discovered Ancient Egyptian nails that are over 5,000 years old.
It's about one-fortieth as big as an Airplane Tray Table
The size of an Airplane Tray Table is about 101,000 square millimeters.
With wide variation among different models of airplanes, in-flight tray tables measure around 41.2 cm (16.5 in) x 24.1 cm (9.5 in) for a total area of 101,000 square millimeters. Flight safety rules require that the tray tables be upright and locked during takeoff and landing so as to reduce the risk of passenger abdominal injury.
It's about one-four-hundredth as big as a Bath Towel
The size of a Bath Towel is about 1,083,800 square millimeters.
(for Fieldcrest Luxury Solid Towels)
Bath towels typically measure 142.24 cm (56 in) by 76.2 cm (30 in), for a total area of about 1,083,800 square millimeters. The city of Bursa, Turkey is known as the birthplace of the modern towel.
It's about one-one-thousand-five-hundredth as big as a King Size Bed
The size of a King Size Bed is about 4,030,000 square millimeters.
(North American/Australian standard; length; mattress only)
A King-Size mattress measures 4,030,000 square millimeters in total area. Although most antique beds were smaller than modern beds, it was not uncommon for beds in the medieval Europe to reach 5,000,000 square millimeters for those in positions of wealth or power.
It's about 4,000 times as big as a Ballpoint Pen Tip
The size of a Ballpoint Pen Tip is about 0.70 square millimeters.
(a.k.a. Biro, a.k.a. ball pen, a.k.a. dot pen) (for medium tip)
The most common size of ballpoint pen — a medium-tip — measures 0.7 sq. mm. A typical ballpoint pen can write more than 8,500 m (28,000 ft) before running out of ink.
It's about one-five-thousand-five-hundredth as big as a Parking Space
The size of a Parking Space is about 15,000,000 square millimeters.
(a.k.a Parking Stall) (average; surface lot; North America)
An average-size parking space in a North American surface lot measures 15,000,000 square millimeters. Due to the high real estate prices at the time, parking spaces in a densely-populated part of Manhattan would sell for an average of $165,000 in 2007, with some spaces fetching up to $225,000.
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