English & US survey units

Section (land unit)

A Public Land Survey System block of nominally one square mile, 640 acres. Quarter sections (160 acres) are classic farm units. Also written Sec., Square-mile section.

1 section = 2,589,988.11 m² = 27,878,400 sq ft = 640 acresUsed in: United States, Canada

1 section =
640 ac
1 section = 640 ac
The value in every unit
UnitValue
Square meters (m²)2,589,988.11 m²
Square feet (ft²)27,878,400 ft²
Square yards (yd²)3,097,600 yd²
Acres (ac)640 ac
Hectares (ha)258.9988 ha
Section1 section

Section in other units

m²sq ftacreshectares
2,589,988.1127,878,400640258.9988
  • = 1 square mile = 640 acres

About the section

The US Public Land Survey System divides land into townships about 6 miles square, each made of 36 sections of nominally one square mile, or 640 acres (about 259 hectares). Canada’s Dominion Lands Survey uses the same idea in the western provinces. Texas and the original thirteen states are among the areas the system does not cover.

Legal descriptions split sections into aliquot parts: a quarter section is 160 acres (the size of a standard Homestead Act claim) and a quarter-quarter section is 40 acres, as in “NE 1/4 of the SW 1/4 of Section 12”. Actual sections differ from the nominal size because of the Earth’s curvature and survey corrections, so the recorded survey governs.

Related measures

  • 1 section = 640 acres = 1 sq mi
  • 1 quarter section = 160 acres
  • 1 quarter-quarter section = 40 acres
  • 36 sections = 1 township

Quick table

SectionSquare feetSquare metersAcres
127,878,4002,589,988.11640
255,756,8005,179,976.221,280
5139,392,00012,949,940.553,200
10278,784,00025,899,881.16,400
20557,568,00051,799,762.2112,800
501,393,920,000129,499,405.5232,000
1002,787,840,000258,998,811.0364,000

Sources

Spotted a value that’s wrong for your area, or a regional value we should add? Email support@landmeasure.app with a source.

Frequently asked questions

How many acres are in a section?

640 acres (one square mile), nominally. Real sections can be slightly larger or smaller.

How big is a quarter-quarter section?

40 acres: a quarter of a 160-acre quarter section.

Related