Square Miles to Acres Converter 2026 - Area Conversion Calculator

Square Miles to Acres Converter

Convert square miles to acres instantly with precise calculations

Formula: acres = square miles × 640

Note: 1 square mile = 640 acres

About Square Miles

The square mile is a unit of area measurement in the imperial system.

  • Used for measuring large land areas
  • Common in geography and real estate
  • 1 square mile = 640 acres
  • Symbol: sq mi or mi²

About Acres

The acre is a unit of area commonly used in land measurement.

  • Traditional unit for farmland and property
  • 1 acre = 43,560 square feet
  • Widely used in agriculture and real estate
  • Symbol: ac

Conversion Examples

Square Miles Acres Use Case
0.1 sq mi 64 acres Small town area
1 sq mi 640 acres City district
10 sq mi 6,400 acres Large ranch
100 sq mi 64,000 acres County area

Conversion Formula & Notes

Formula

Acres = Square Miles × 640

Square Miles = Acres ÷ 640

Important Notes

  • • 1 square mile = 640 acres exactly
  • • Used primarily in US land measurement
  • • Common in real estate and agriculture
  • • Different from metric hectares