# How big is 30 square centimeters?

It's about three-fifths as big as a Post-it® Note (3M)

The size of a Post-it® Note (3M) is about 54 square centimeters.

(3M) (generically sticky notes, a.k.a. repositionable notes, a.k.a. repositional notes)

A Post-it® Note measures 54 sq. cm 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 56 square centimeters.

(ISO 216 B8 size)

A single ISO 216 B8-size playing card measures 56 sq. cm. Although this size is the most common playing card, many casinos use the smaller "bridge size" card — 26 square centimeters smaller.

It's about four times as big as a Secure Digital (SD) card

The size of a Secure Digital (SD) card is about 7.70 square centimeters.

A Secure Digital (SD) card measures 3.2 cm by 2.4 cm for a total area of 7.7 sq. cm. SDXC Cards, the latest standard for the technology, will allow the cards to hold up to 2 terabytes of data.

It's about six-and-a-half times as big as a US Quarter

The size of a US Quarter is about 4.6220 square centimeters.

(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 4.6220 square centimeters.

It's about eight times as big as a Postage Stamp

The size of a Postage Stamp is about 4 square centimeters.

(average; United States dimensions)

A typical postage stamp measures an average of 4 square centimeters. 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 eight-and-a-half times as big as a US Nickel

The size of a US Nickel is about 3.5330 square centimeters.

(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 3.5330 square centimeters.

It's about ten-and-a-half times as big as a US Penny

The size of a US Penny is about 2.850 square centimeters.

(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 2.850 square centimeters.

It's about twelve times as big as a US Dime

The size of a US Dime is about 2.5190 square centimeters.

(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 2.5190 square centimeters.

It's about one-fifteenth as big as an Apple iPad

The size of an Apple iPad is about 400.20 square centimeters.

(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 400.20 square centimeters. The base model iPad Air features 16 GB of storage capacity.

It's about one-thirty-fifth as big as an Airplane Tray Table

The size of an Airplane Tray Table is about 1,010 square centimeters.

(average)

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 1,010 square centimeters. 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 forty times as big as a Nailhead

The size of a Nailhead is about 0.77740 square centimeters.

(for 11-gauge wire nai)

An 11-gauge nailhead measures 0.7774 sq. cm (0.1205 sq. in). Nails have been used since ancient times; archaeologists have discovered Ancient Egyptian nails that are over 5,000 years old.

It's about one-three-hundred-fiftieth as big as a Bath Towel

The size of a Bath Towel is about 10,838 square centimeters.

(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 10,838 square centimeters. 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 40,300 square centimeters.

(North American/Australian standard; length; mattress only)

A King-Size mattress measures 40,300 square centimeters in total area. Although most antique beds were smaller than modern beds, it was not uncommon for beds in the medieval Europe to reach 50,000 square centimeters for those in positions of wealth or power.

It's about 4,500 times as big as a Ballpoint Pen Tip

The size of a Ballpoint Pen Tip is about 0.007 square centimeters.

(a.k.a. Biro, a.k.a. ball pen, a.k.a. dot pen) (for medium tip)

The most common size of ballpoint pen â€” a medium-tip â€” measures 0.007 square centimeters. A typical ballpoint pen can write more than 8,500 m (28,000 ft) before running out of ink.

It's about one-five-thousandth as big as a Parking Space

The size of a Parking Space is about 150,000 square centimeters.

(a.k.a Parking Stall) (average; surface lot; North America)

An average-size parking space in a North American surface lot measures 150,000 square centimeters. 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.