How many square feet are in 1 acre?

1 ac equals 43560 ft². This is an exact conversion factor defined by NIST.

How do I convert acres to square feet?

Multiply the value in ac by the conversion factor. For example, 10 ac = 435600 ft². Use our calculator above for instant results.

Is the acres to square feet conversion exact?

Yes, this conversion is mathematically exact based on the international definition of these units (NIST SP 811).

Can I convert acres to square feet offline?

Yes! OmniConvert runs entirely in your browser — no internet connection needed after the page loads. Your data never leaves your device, ensuring complete privacy.

What is the difference between acres and square feet?

Acres (ac) and Square Feet (ft²) are both units of area but belong to different measurement systems. 1 ac = 43560 ft². Use the converter above to switch between them instantly.

Acres to Square Feet (ac → ft²) — Free Online Converter

ac → ft² Reference Table

ac	ft²
0.001 ac	43.56 ft²
0.002 ac	87.12 ft²
0.003 ac	130.68 ft²
0.004 ac	174.24 ft²
0.005 ac	217.8 ft²
0.006 ac	261.36 ft²
0.007 ac	304.92 ft²
0.008 ac	348.48 ft²
0.009 ac	392.04 ft²
0.01 ac	435.6 ft²
0.02 ac	871.2 ft²
0.03 ac	1306.8 ft²
0.04 ac	1742.4 ft²
0.05 ac	2178 ft²
0.06 ac	2613.6 ft²
0.07 ac	3049.2 ft²
0.08 ac	3484.8 ft²
0.09 ac	3920.4 ft²
0.1 ac	4356 ft²
0.2 ac	8712 ft²
0.3 ac	13068 ft²
0.4 ac	17424 ft²
0.5 ac	21780 ft²
0.6 ac	26136 ft²
0.7 ac	30492 ft²
0.8 ac	34848 ft²
0.9 ac	39204 ft²
1 ac	43560 ft²
1.5 ac	65340 ft²
2 ac	87120 ft²
2.5 ac	108900 ft²
3 ac	130680 ft²
3.5 ac	152460 ft²
4 ac	174240 ft²
4.5 ac	196020 ft²
5 ac	217800 ft²
5.5 ac	239580 ft²
6 ac	261360 ft²
6.5 ac	283140 ft²
7 ac	304920 ft²
7.5 ac	326700 ft²
8 ac	348480 ft²
8.5 ac	370260 ft²
9 ac	392040 ft²
9.5 ac	413820 ft²
10 ac	435600 ft²
11 ac	479160 ft²
12 ac	522720 ft²
13 ac	566280 ft²
14 ac	609840 ft²
15 ac	653400 ft²
16 ac	696960 ft²
17 ac	740520 ft²
18 ac	784080 ft²
19 ac	827640 ft²
20 ac	871200 ft²
25 ac	1089000 ft²
30 ac	1306800 ft²
35 ac	1524600 ft²
40 ac	1742400 ft²
45 ac	1960200 ft²
50 ac	2178000 ft²
55 ac	2395800 ft²
60 ac	2613600 ft²
65 ac	2831400 ft²
70 ac	3049200 ft²
75 ac	3267000 ft²
80 ac	3484800 ft²
85 ac	3702600 ft²
90 ac	3920400 ft²
95 ac	4138200 ft²
100 ac	4356000 ft²
120 ac	5227200 ft²
125 ac	5445000 ft²
130 ac	5662800 ft²
140 ac	6098400 ft²
150 ac	6534000 ft²
160 ac	6969600 ft²
175 ac	7623000 ft²
180 ac	7840800 ft²
200 ac	8712000 ft²
225 ac	9801000 ft²
250 ac	10890000 ft²
275 ac	11979000 ft²
300 ac	13068000 ft²
350 ac	15246000 ft²
400 ac	17424000 ft²
450 ac	19602000 ft²
500 ac	21780000 ft²
600 ac	26136000 ft²
700 ac	30492000 ft²
750 ac	32670000 ft²
800 ac	34848000 ft²
900 ac	39204000 ft²
1000 ac	43560000 ft²
1200 ac	52272000 ft²
1250 ac	54450000 ft²
1500 ac	65340000 ft²
1750 ac	76230000 ft²
2000 ac	87120000 ft²
2500 ac	108900000 ft²
3000 ac	130680000 ft²
4000 ac	174240000 ft²
4500 ac	196020000 ft²
5000 ac	217800000 ft²
6000 ac	261360000 ft²
7000 ac	304920000 ft²
7500 ac	326700000 ft²
8000 ac	348480000 ft²
9000 ac	392040000 ft²
10000 ac	435600000 ft²
15000 ac	653400000 ft²
20000 ac	871200000 ft²
25000 ac	1089000000 ft²
50000 ac	2178000000 ft²
75000 ac	3267000000 ft²
100000 ac	4356000000 ft²

Values based on NIST SP 811 conversion factors

Why Convert Acres to Square Feet?

Converting between acres (ac) and square feet (ft²) is one of the most common area conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert ac to ft² saves time and prevents errors.

Area conversions between ac and ft² are critical for real estate valuation, agriculture, and urban planning. Farmers need accurate conversions when calculating crop yields, fertilizer application rates, or irrigation needs across hectares and acres. Homeowners and interior designers use area conversion for flooring, painting, and carpeting estimates to avoid costly material waste or shortages. In environmental science, deforestation rates and habitat protection zones are often reported in differing units depending on the region. A misunderstanding in area units can lead to significant financial discrepancies in property sales or incorrect resource allocation in land management projects.

How to Convert Acres to Square Feet

To convert acres to square feet, use the following formula:

ft² = ac × 43560

Example: 1 ac = 43560 ft²

For example, 5 ac = 217800 ft², 10 ac = 435600 ft², and 100 ac = 4356000 ft². For larger values, 1000 ac = 43560000 ft². Conversely, 1 ft² = 0.00002295684114 ac. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Mistakes to Avoid

Squaring the conversion factor: forgetting to square the linear conversion (1 ft = 12 in, but 1 sq ft = 144 sq in).
Confusing land units: mixing up acres and hectares.
Ignoring shape: area formulas differ for circles vs squares.

Pro Tips

Double check squares: Always ensure you're using square units (m²), not linear (m).
Estimation: An acre is roughly a football field (excluding end zones).
Paint calc: 1 gallon of paint covers approx 350-400 sq ft.

What is a Acre?

The acre is a unit of land area in the Imperial and US customary systems. One acre equals 43,560 square feet or approximately 4,047 square meters.

Acres are standard for measuring large plots of land, agricultural fields, and public parks in the US, UK, and former British Commonwealth countries.

What is a Square Foot?

The square foot (sq ft) is a unit of area in the Imperial and US customary systems. It corresponds to the area of a square with sides of one foot.

Square feet are primarily used in the US, UK, Canada, and parts of Asia (like Hong Kong) for real estate listings and apartment sizes.

Acres → Square Feet

Acres to Square Feet Formula