How Many Square Feet in an Acre?

One acre equals exactly 43,560 square feet. Here is a quick reference guide with conversions, visual comparisons, and practical examples for landscaping and property planning.

The exact conversion

1 acre = 43,560 square feet

1 acre = 4,840 square yards

1 acre = 0.405 hectares

Acres to square feet — quick reference

Acres	Square feet
0.1	4,356
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

Formulas

Acres → square feet: Acres × 43,560 = sq ft

Square feet → acres: Sq ft ÷ 43,560 = acres

Example: A 2.5 acre parcel = 2.5 × 43,560 = 108,900 sq ft

What does an acre look like?

Shape	Dimensions
Square (most compact)	208.7 ft × 208.7 ft
Rectangle (typical lot)	100 ft × 435.6 ft
Rectangle (narrow)	50 ft × 871.2 ft
Football field (ref)	53.3 ft × 300 ft = 16,000 sq ft (0.37 acres)

A standard football field (including end zones) is about 48,000 sq ft — slightly larger than one acre.

Common lot sizes in acres

Lot description	Approximate size
City / urban lot	0.05–0.1 acres
Suburban quarter-acre	10,890 sq ft
Half-acre lot	21,780 sq ft
1-acre rural lot	43,560 sq ft
Small farm / homestead	5–10 acres

Using this for landscaping

If you are seeding or sodding a large lawn, you need to know your area in square feet. Measure with a GPS app (most phones have one) or multiply the rough dimensions.

Example: A 1.5-acre lawn = 1.5 × 43,560 = 65,340 sq ft

At 7 lbs of tall fescue seed per 1,000 sq ft: 65,340 ÷ 1,000 × 7 = 457 lbs of seed

Frequently Asked Questions

How many square feet are in an acre?

There are exactly 43,560 square feet in one acre. This is derived from the chain-furlong system: 1 acre = 1 chain × 1 furlong = 66 ft × 660 ft = 43,560 sq ft.

How many square feet are in a half acre?

Half an acre is 21,780 square feet. A quarter acre is 10,890 sq ft. These are common residential lot sizes — a typical suburban lot in the US is 0.15–0.25 acres (6,534–10,890 sq ft).

How big is an acre visually?

One acre is slightly smaller than an American football field (which is 48,000 sq ft including end zones, or 57,600 sq ft with end zones). An acre is roughly 208 × 209 feet as a square, or 100 × 435 feet as a long rectangle.

How many acres is a typical house lot?

The median US residential lot is about 0.22 acres (9,583 sq ft) in suburban areas. Urban lots are often 0.05–0.1 acres (2,000–4,400 sq ft). Rural properties range from 1 acre to hundreds of acres.

How do I convert square feet to acres?

Divide square feet by 43,560 to get acres. For example, 87,120 sq ft ÷ 43,560 = 2 acres. To go the other way, multiply acres × 43,560 to get square feet.