Convert Acre to Square Mile

How to convert Acres to Square Miles?

To convert acres to square miles, use the exact U.S. relation: 1 square mile = 640 acres.

Divide acreage by 640 to get mi2 - multiply by 640 to go the other way. Keep significant figures consistent with your measurements and round at the end. For mixed units, note that 1 acre = 43,560 ft2 and 1 mi2 = 27,878,400 ft2, which also yields factor 640. Survey and international acres coincide in this conversion, so the factor is identical.

Conversion formula: acre to sq mi

Example calculation

• Square Miles = Acre × 0.001563
• Square Miles = 120 × 0.001563
• Square Miles = 0.1875

FAQ

How many acres are in a square mile?

Exactly 640 acres. This is the standard U.S. customary relation used in surveying and land records.

How do I convert acres to square miles?

Use: square miles = acres ÷ 640. Examples: 50 acres ÷ 640 = 0.078125 mi²; 1,280 acres ÷ 640 = 2 mi². Keep significant figures consistent with your measurements.

How do I convert square miles to acres?

Use: acres = square miles × 640. Examples: 2.5 mi2 × 640 = 1,600 acres - 0.75 mi2 × 640 = 480 acres.

Dimensions of Acre

Unit	1 Acre
Square feet	43560 sq ft
Square yard	4840 sq yd
Square meters	4046,85 sq mt
Square centimeters	40468564,22 sq cm
Square kilometers	0,004047 sq km
Square Inches	6272640 sq in
Square Miles	0,001563 sq mi
Hectare	0,404686 ha

Popular Acres to Square Miles conversions

Acre	Square Miles
1 acre	0,001563 sq mi
2 acre	0,003125 sq mi
3 acre	0,004687 sq mi
4 acre	0,006250 sq mi
5 acre	0,007813 sq mi
6 acre	0,009375 sq mi
7 acre	0,010937 sq mi
8 acre	0,0125 sq mi
9 acre	0,014063 sq mi
10 acre	0,015625 sq mi
100 acre	0,15625 sq mi
1000 acre	1,5625 sq mi
2000 acre	3,125 sq mi
5000 acre	7,8125 sq mi
10000 acre	15,625 sq mi