# Acres to Square Feet Converter (1 Acre = 43,560 sq ft) | FOUND

Convert acres to square feet instantly. One acre is exactly 43,560 square feet. Includes a quick reference table and the formula for any lot size.

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

## Acres to square feet

One acre is exactly 43,560 square feet. Type a number in either box.

## The formula

Square feet = acres × 43,560.

## Quick reference

| Acres | Square feet |
|---|---|
| 0.25 | 10,890 |
| 0.5 | 21,780 |
| 1 | 43,560 |
| 2 | 87,120 |
| 5 | 217,800 |
| 10 | 435,600 |
| 40 | 1,742,400 |
| 100 | 4,356,000 |

## Why the number is 43,560

An acre began as the area a team of oxen could plow in a day: a strip one furlong long and one chain wide. A furlong is 660 feet and a chain is 66 feet, and 660 times 66 is 43,560.

## For lots and land

Lot sizes in zoning ordinances are usually written in square feet, and land is usually sold by the acre. Converting between them is the first step in seeing how many lots a tract might hold. See the [lots per acre calculator](/tools/lots-per-acre-calculator/).

## Questions

### How many square feet is an acre?

One acre is exactly 43,560 square feet.

### How many square feet is half an acre?

Half an acre is 21,780 square feet.

### How many square feet is a quarter acre?

A quarter acre is 10,890 square feet.

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