Table of Surface Measure

144 square inches = 1 square foot

9 square feet = 1 square yard

30 1/4 square yards = 1 square rod

160 square rods = 1 acre

640 acres = 1 square mile

An acre measures 208.71 ft. on each side.

A section of land is 1 square mile.

A quarter of land is 160 acres.

A township is 36 square miles.