Square Inches to Ngan (Thai) (in² to ngan)

1 square inch equals 0.0000016129 ngan (Thai) exactly.

1 square inch = 0.0000016129 ngan (Thai)

How to convert square inches to ngan (Thai)

To convert square inches to ngan (Thai), multiply the number of square inches by 0.0000016129. This factor is exact. To go the other way, multiply ngan (Thai) by 620,001.24 (rounded).

ngan (Thai) = square inches × 0.0000016129

Example: 10 square inches = 0.000016129 ngan (Thai).

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

Ngan (Thai) (ngan)

ThaiTraditional unit (still used in some regions)

A quarter of a rai: exactly 400 m². Used for house plots in Thailand.

Ngan means work in Thai, and as a land unit it is the middle step between the rai and the square wa. Four ngan make one rai, and one ngan holds 100 square wa, so it covers 400 square meters, the area of a square 20 meters on a side.

That size suits a village or suburban house plot, which is why ngan crop up in listings for building land, while farms are quoted in rai. Deeds combine the units, so a title might read as a number of rai, then ngan, then square wa.

The ngan comes from the same traditional Thai scheme as the wa and sen, fixed against metric lengths after the cadastral survey of 1896. Its 400 square meters are exact in the modern definition, and it is about one tenth of an acre.

1 ngan (Thai) = 400 square meters (exactly).

Sources: Wikipedia: Rai (unit); Wikipedia: Thai units of measurement

Related conversions

See all area units.