Square Wa (Thai) to Acres (sq wa to ac)

1 square wa (Thai) equals 0.0009884215259 acres (rounded).

1 square wa (Thai) = 0.0009884215259 acres

How to convert square wa (Thai) to acres

To convert square wa (Thai) to acres, multiply the number of square wa (Thai) by 0.0009884215259. The factor is rounded to 10 significant digits. To go the other way, multiply acres by 1,011.714106 (rounded).

acres = square wa (Thai) × 0.0009884215259

Example: 10 square wa (Thai) = 0.009884215259 acres.

About these units

Square Wa (Thai) (sq wa)

ThaiTraditional unit (still used in some regions)

A square 2 meters on a side: exactly 4 m². Thai property prices are often quoted per square wa.

Tarang wa, the Thai name behind the English square wa, literally refers to a grid of wa. It is the smallest standard Thai land unit, the area of a square with sides of one wa, so with a wa of 2 meters it equals 4 square meters.

One hundred square wa form a ngan and 400 form a rai. Because it is so small, it is the unit in which urban plots and condominium-adjacent land are usually priced, and listings often quote a price per square wa.

Its value is the square of the wa, so any change to the wa would flow straight through, but the metric definition has been fixed since the cadastral survey of the Royal Thai Survey Department began in 1896. A typical townhouse lot of 20 square wa is therefore 80 square meters.

1 square wa (Thai) = 4 square meters (exactly).

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

Acre (ac)

US & ImperialCurrent unit

43,560 square feet or exactly 4,046.8564224 m², about 40% of a hectare. Originally the area a yoke of oxen could plow in a day.

Ploughland gave the acre its name: it traces to Old Norse akr, meaning cultivated land, and is related to German Acker and Latin ager. In medieval England it was a farming measure, the land one man with a team of eight oxen could plough in a day. The traditional strip was 40 perches long and 4 perches wide, which is 660 by 66 feet, or ten square chains. The shape was never the point, and the article on the unit stresses that any area of 43,560 square feet is an acre.

An acre is 43,560 square feet, 4,840 square yards or 1/640 of a square mile, close to 0.4 hectare. For Americans, it is roughly 88 by 55 yards, about 90 percent of a football field without the end zones. The Weights and Measures Act 1878 fixed it at 4,840 square yards in Britain, where trade use ended in 1995. The 1959 international acre is exactly 4,046.8564224 m²; the US survey acre, about 4,046.872 m², differed slightly, and US survey units were retired after 2022.

1 acre = 4,046.856422 square meters (approximately).

Sources: Wikipedia: Acre; NIST Guide to the SI, Appendix B.8: conversion factors

Related conversions

See all area units.