Square Inches to Pyeong (in² to py)

1 square inch equals 0.0001951609 pyeong exactly.

1 square inch = 0.0001951609 pyeong

How to convert square inches to pyeong

To convert square inches to pyeong, multiply the number of square inches by 0.0001951609. This factor is exact. To go the other way, multiply pyeong by 5,123.97719 (rounded).

pyeong = square inches × 0.0001951609

Example: 10 square inches = 0.001951609 pyeong.

About these units

Square Inch (in²)

US & ImperialCurrent unit

A square one inch on a side, exactly 6.4516 cm². Used for small parts and for pressure (pounds per square inch).

Latin uncia, one twelfth, gave English the inch, which Old English borrowed as ynce. A statute of Edward II in 1324 defined it as three barleycorns, dry and round, set end to end, and the barleycorn remained the base for centuries after 1066. The modern square inch rests on a 20th-century agreement: the United States adopted a yard of exactly 0.9144 meter on 1 July 1959, the United Kingdom followed effective 1 January 1964, and the inch became exactly 25.4 mm.

Squaring that gives exactly 6.4516 cm² for one square inch, and one square meter is about 1,550 of them. Its best-known descendant is the pound per square inch, psi, the pressure unit still used for American tires and air tanks: atmospheric pressure at sea level is about 14.7 psi, a car tire is typically inflated to around 32 psi above the surrounding air, and one psi is about 6.895 kilopascals. The square inch itself is common in the US and UK for small parts and printed material.

1 square inch = 0.00064516 square meters (exactly).

Sources: Wikipedia: Square inch; Wikipedia: Inch; Wikipedia: Pounds per square inch

Pyeong (py)

KoreanTraditional unit (still used in some regions)

Exactly 400/121 m² (3.3058 m²), the Korean unit equivalent to the Japanese tsubo and the Taiwanese ping. Still used informally for apartment sizes in Korea and Taiwan.

Floor space in South Korea is still often quoted in pyeong, a word that, like the Japanese tsubo and Taiwanese ping, stands for a square whose side is one kan or bu, equal to 36 square Chinese or Japanese feet. The Korean version was fixed during the Japanese occupation at 400/121 square meters, about 3.3058 square meters, which is roughly the area of two tatami mats.

Korean sources use the pyeong as the standard traditional measure for homes. Typical benchmarks are about 25 pyeong for an average house and 8 to 12 for a studio flat. Official use was banned in 1961, but the ban had little effect until commercial use was criminalised from 1 July 2007, after which listings show square meters with the pyeong figure as an informal extra. Taiwan introduced the ping under Japanese rule and still uses it, at about 3.305 square meters. Wikipedia notes that a Chinese version based on metric feet would be near 4 square meters but is almost unknown.

1 pyeong = 3.305785124 square meters (approximately).

Sources: Wikipedia: Pyeong

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