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Area • NIST Exact

Square Feet → Acres

ft² → ac

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NIST Exact

Based on U.S. National Institute of Standards

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Square Feet to Acres Formula

To convert from Square Feet to Acres, you can use the following formula:

Acres = Square Feet × NaN

This means you need to multiply your Square Feet value by NaN to get the equivalent value in Acres.

ft² → ac Reference Table

ft² ac
0.001 ft² 2.295684114e-8 ac
0.002 ft² 4.591368228e-8 ac
0.003 ft² 6.887052342e-8 ac
0.004 ft² 9.182736455e-8 ac
0.005 ft² 1.147842057e-7 ac
0.006 ft² 1.377410468e-7 ac
0.007 ft² 1.60697888e-7 ac
0.008 ft² 1.836547291e-7 ac
0.009 ft² 2.066115702e-7 ac
0.01 ft² 2.295684114e-7 ac
0.02 ft² 4.591368228e-7 ac
0.03 ft² 6.887052342e-7 ac
0.04 ft² 9.182736455e-7 ac
0.05 ft² 0.000001147842057 ac
0.06 ft² 0.000001377410468 ac
0.07 ft² 0.00000160697888 ac
0.08 ft² 0.000001836547291 ac
0.09 ft² 0.000002066115702 ac
0.1 ft² 0.000002295684114 ac
0.2 ft² 0.000004591368228 ac
0.3 ft² 0.000006887052342 ac
0.4 ft² 0.000009182736455 ac
0.5 ft² 0.00001147842057 ac
0.6 ft² 0.00001377410468 ac
0.7 ft² 0.0000160697888 ac
0.8 ft² 0.00001836547291 ac
0.9 ft² 0.00002066115702 ac
1 ft² 0.00002295684114 ac
1.5 ft² 0.00003443526171 ac
2 ft² 0.00004591368228 ac
2.5 ft² 0.00005739210285 ac
3 ft² 0.00006887052342 ac
3.5 ft² 0.00008034894399 ac
4 ft² 0.00009182736455 ac
4.5 ft² 0.0001033057851 ac
5 ft² 0.0001147842057 ac
5.5 ft² 0.0001262626263 ac
6 ft² 0.0001377410468 ac
6.5 ft² 0.0001492194674 ac
7 ft² 0.000160697888 ac
7.5 ft² 0.0001721763085 ac
8 ft² 0.0001836547291 ac
8.5 ft² 0.0001951331497 ac
9 ft² 0.0002066115702 ac
9.5 ft² 0.0002180899908 ac
10 ft² 0.0002295684114 ac
11 ft² 0.0002525252525 ac
12 ft² 0.0002754820937 ac
13 ft² 0.0002984389348 ac
14 ft² 0.0003213957759 ac
15 ft² 0.0003443526171 ac
16 ft² 0.0003673094582 ac
17 ft² 0.0003902662994 ac
18 ft² 0.0004132231405 ac
19 ft² 0.0004361799816 ac
20 ft² 0.0004591368228 ac
25 ft² 0.0005739210285 ac
30 ft² 0.0006887052342 ac
35 ft² 0.0008034894399 ac
40 ft² 0.0009182736455 ac
45 ft² 0.001033057851 ac
50 ft² 0.001147842057 ac
55 ft² 0.001262626263 ac
60 ft² 0.001377410468 ac
65 ft² 0.001492194674 ac
70 ft² 0.00160697888 ac
75 ft² 0.001721763085 ac
80 ft² 0.001836547291 ac
85 ft² 0.001951331497 ac
90 ft² 0.002066115702 ac
95 ft² 0.002180899908 ac
100 ft² 0.002295684114 ac
120 ft² 0.002754820937 ac
125 ft² 0.002869605142 ac
130 ft² 0.002984389348 ac
140 ft² 0.003213957759 ac
150 ft² 0.003443526171 ac
160 ft² 0.003673094582 ac
175 ft² 0.004017447199 ac
180 ft² 0.004132231405 ac
200 ft² 0.004591368228 ac
225 ft² 0.005165289256 ac
250 ft² 0.005739210285 ac
275 ft² 0.006313131313 ac
300 ft² 0.006887052342 ac
350 ft² 0.008034894399 ac
400 ft² 0.009182736455 ac
450 ft² 0.01033057851 ac
500 ft² 0.01147842057 ac
600 ft² 0.01377410468 ac
700 ft² 0.0160697888 ac
750 ft² 0.01721763085 ac
800 ft² 0.01836547291 ac
900 ft² 0.02066115702 ac
1000 ft² 0.02295684114 ac
1200 ft² 0.02754820937 ac
1250 ft² 0.02869605142 ac
1500 ft² 0.03443526171 ac
1750 ft² 0.04017447199 ac
2000 ft² 0.04591368228 ac
2500 ft² 0.05739210285 ac
3000 ft² 0.06887052342 ac
4000 ft² 0.09182736455 ac
4500 ft² 0.1033057851 ac
5000 ft² 0.1147842057 ac
6000 ft² 0.1377410468 ac
7000 ft² 0.160697888 ac
7500 ft² 0.1721763085 ac
8000 ft² 0.1836547291 ac
9000 ft² 0.2066115702 ac
10000 ft² 0.2295684114 ac
15000 ft² 0.3443526171 ac
20000 ft² 0.4591368228 ac
25000 ft² 0.5739210285 ac
50000 ft² 1.147842057 ac
75000 ft² 1.721763085 ac
100000 ft² 2.295684114 ac

Values based on NIST SP 811 conversion factors

Why Convert Square Feet to Acres?

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

Area conversions between ft² and ac 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 Square Feet to Acres

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

ac = ft² × 0.00002295684114

Example: 1 ft² = 0.00002295684114 ac

For example, 5 ft² = 0.0001147842057 ac, 10 ft² = 0.0002295684114 ac, and 100 ft² = 0.002295684114 ac. For larger values, 1000 ft² = 0.02295684114 ac. Conversely, 1 ac = 43560 ft². 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 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.

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.

Frequently Asked Questions

Area More Conversions

m² → ft²ft² → m²ha → acac → hakm² → mi²mi² → km²m² → 亩亩 → m²

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