# Square Miles to Acres Converter (1 sq mi = 640 Acres) | FOUND

Convert square miles to acres instantly. One square mile is exactly 640 acres. Includes sections, quarter sections, and a quick reference table.

Canonical: https://lotsfound.com/tools/square-miles-to-acres/

## Square miles to acres

One square mile is exactly 640 acres. Multiply square miles by 640, or type a number in either box.

## The formula

Acres = square miles × 640.

## Quick reference

| Square miles | Acres |
|---|---|
| 0.25 | 160 |
| 0.5 | 320 |
| 1 | 640 |
| 2 | 1,280 |
| 5 | 3,200 |
| 10 | 6,400 |
| 100 | 64,000 |

## Sections and quarter sections

Much of the United States was surveyed into sections of one square mile, or 640 acres. A quarter section is 160 acres, and a quarter of that is 40 acres, which is where "the back forty" comes from. North Carolina was settled before that system and uses older metes-and-bounds descriptions, so its parcels rarely fall on neat section lines.

## Reading large tracts

A one-mile by one-mile square is 640 acres. A campus-scale tract of a few hundred acres is a sizable share of a square mile. When tracts reach that size, the question shifts from how much land to how much of it can be used. See the [usable acreage calculator](/tools/usable-acreage-calculator/).

## Questions

### How many acres are in a square mile?

There are exactly 640 acres in one square mile.

### How many acres is a quarter of a square mile?

A quarter of a square mile is 160 acres.

### How many square miles is 1,000 acres?

One thousand acres is about 1.56 square miles.

Transactions are handled through a licensed North Carolina real estate brokerage.