How many square miles are in 1 acre?

1 ac equals 0.0015625 mi². This is an exact conversion factor defined by NIST.

How do I convert acres to square miles?

Multiply the value in ac by the conversion factor. For example, 10 ac = 0.015625 mi². Use our calculator above for instant results.

Is the acres to square miles 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 miles offline?

Yes! Metric Converter 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 miles?

Acres (ac) and Square Miles (mi²) are both units of area but belong to different measurement systems. 1 ac = 0.0015625 mi². Use the converter above to switch between them instantly.

Acres to Square Miles (ac → mi²) — Free Online Converter

Формула преобразования Акры в Квадратные мили

Чтобы преобразовать Акры в Квадратные мили, вы можете использовать следующую формулу:

Квадратные мили = Акры × 640

Это означает, что вам нужно умножить значение Акры на 640, чтобы получить эквивалентное значение в Квадратные мили.

ac → mi² Справочная таблица

ac	mi²
0.01 ac	0.000015625 mi²
0.1 ac	0.00015625 mi²
0.5 ac	0.00078125 mi²
1 ac	0.0015625 mi²
5 ac	0.0078125 mi²
10 ac	0.015625 mi²
50 ac	0.078125 mi²
100 ac	0.15625 mi²
500 ac	0.78125 mi²
1000 ac	1.5625 mi²

Значения основаны на коэффициентах конвертации NIST SP 811

Why Convert Acres to Square Miles?

Converting between acres (ac) and square miles (mi²) is one of the most common area conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert ac to mi² saves time and prevents errors.

Area conversions between ac and mi² 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 Miles

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

mi² = ac × 0.0015625

Example: 1 ac = 0.0015625 mi²

For example, 5 ac = 0.0078125 mi², 10 ac = 0.015625 mi², and 100 ac = 0.15625 mi². For larger values, 1000 ac = 1.5625 mi². Conversely, 1 mi² = 640 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 Mile?

An Imperial/US unit of area equal to 640 acres.

Used for large land areas in the US and UK.

Акры → Квадратные мили