Acres to Square Feet

1 ac = 43,560 ft²

Land listings in the United States usually quote lot and parcel sizes in acres, while house plans, building permits, and flooring quotes use square feet. Converting acres to square feet helps buyers, builders, and landowners picture how much usable space a parcel actually offers and compare it with a home footprint.

From

When you need to convert acres to square feet

Comparing the lot size on a real estate listing with a planned house footprint
Checking zoning rules that set minimum lot sizes in square feet
Estimating sod, seed, or fertilizer quantities sold by coverage in square feet
Planning fencing or paving on part of a rural property

How to convert acres to square feet

ft² = ac × 43,560

Example: 5 ac = 217,800 ft²

Common lot and parcel sizes

Acres (ac)	Square Feet (ft²)
0.1 ac	4,356 ft²
0.25 ac	10,890 ft²
0.5 ac	21,780 ft²
0.75 ac	32,670 ft²
1 ac	43,560 ft²
2 ac	87,120 ft²
5 ac	217,800 ft²
10 ac	435,600 ft²
40 ac	1,742,400 ft²

Tips for converting acres to square feet

One acre is exactly 43,560 square feet, so multiplying acres by that number gives an exact result with no rounding.
An acre has no fixed shape. A square acre is about 208.7 feet on each side, but long, narrow parcels can have the same area.
For quick estimates, about 44,000 square feet per acre is within about 1% and makes multiplying fractional acres easier.

Acres to Square Feet conversion table

Acres (ac)	Square Feet (ft²)
1 ac	43,560 ft²
2 ac	87,120 ft²
3 ac	130,680 ft²
4 ac	174,240 ft²
5 ac	217,800 ft²
6 ac	261,360 ft²
7 ac	304,920 ft²
8 ac	348,480 ft²
9 ac	392,040 ft²
10 ac	435,600 ft²
15 ac	653,400 ft²
20 ac	871,200 ft²
25 ac	1,089,000 ft²
30 ac	1,306,800 ft²
40 ac	1,742,400 ft²
50 ac	2,178,000 ft²
75 ac	3,267,000 ft²
100 ac	4,356,000 ft²
250 ac	10,890,000 ft²
500 ac	21,780,000 ft²
1,000 ac	43,560,000 ft²

About the units

Acres: The acre is an imperial and US customary unit of land area equal to 43,560 square feet, or about 4,046.86 square meters.

Square Feet: A square foot is the area of a square with 1-foot sides, about 0.0929 square meters. It is the standard unit for floor area in US real estate.

Frequently asked questions

How many square feet are in 1 acre?

1 acre equals 43,560 square feet.

How many acres are in 1 square foot?

1 square foot equals 0.00002295684 acres.

How do I convert acres to square feet?

Use the formula ft² = ac × 43,560.

What is 10 acres in square feet?

10 acres equals 435,600 square feet.

Related conversions

Factors: NIST SP 811 · SI Brochure · NIST Handbook 44 — Updated October 17, 2026