Texas Agriculture Code - AGRIC § 13.022. Standard for Length and Surface

(a) The standard unit of length and surface is the yard. The yard is divided into three equal parts called feet. Each foot is divided into 12 parts called inches. All measures of extension, including lineal, superficial, and solid measures, shall be derived and ascertained from the yard.

(b) For measure of a commodity commonly sold by the yard, including cloth, the yard may be divided into halves, quarters, eighths, and sixteenths.

(c) The rod, pole, or perch contains 5 1/2 yards. The mile contains 1,760 yards. The Spanish vara contains 33 1/3 inches.

(d) If land is measured by the English rule, the chain for measuring land shall be 22 yards long and divided into 100 equal parts called links.

(e) For land measure, the acre is measured horizontally and contains 4,840 square yards, and a square mile contains 640 acres.