Convert between square miles (mi²) and acres (ac) for area measurements. Perfect for land surveys, real estate, geography, and agricultural calculations.
Conversion Factor:
1 Square Mile (mi²) = 640 Acres (ac) | 1 Acre (ac) = 0.0015625 Square Miles (mi²)
ac = mi² × 640 | mi² = ac × 0.0015625
Accepts decimal values (e.g., 0.5 square miles = 320 acres)
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Two common units of area used in land measurement, real estate, and geography
Typical areas in both units for practical context:
| Object/Application | Square Miles (mi²) | Acres (ac) |
|---|---|---|
| Small farm plot | 0.0156 mi² | 10 ac |
| Central Park (New York) | 1.31 mi² | 836 ac |
| City of San Francisco | 47 mi² | 30,080 ac |
| State of Rhode Island | 1,214 mi² | 776,960 ac |
| Country of Malta | 122 mi² | 78,080 ac |
Common area conversions for real estate, agriculture, and geography use
| Square Miles (mi²) | = | Acres (ac) | Practical Context |
|---|---|---|---|
| 0.1 mi² | = | 64 ac | Small ranch |
| 0.5 mi² | = | 320 ac | Large farm |
| 1 mi² | = | 640 ac | Basic conversion reference |
| 5 mi² | = | 3,200 ac | Small nature reserve |
| 10 mi² | = | 6,400 ac | Rural township area |
| 50 mi² | = | 32,000 ac | Medium-sized city district |
| 100 mi² | = | 64,000 ac | Large county subdivision |
Conversion factor: 1 square mile = 640 acres | 1 acre = 0.0015625 square miles
Common questions about square mile and acre measurements
To convert square miles to acres, use the fixed conversion factor (1 square mile = 640 acres):
acres = square miles × 640
For example, to convert 2.5 square miles to acres:
2.5 mi² × 640 = 1,600 ac
This factor is exact (not rounded), so results are precise for all calculations.
Conversions between square miles and acres are common in these scenarios:
The primary differences are:
| Aspect | Square Mile (mi²) | Acre (ac) |
|---|---|---|
| Scale | Large-scale measurements | Medium-scale measurements |
| Typical Use | Cities, counties, states | Farms, land plots, small parks |
| Size Relative to Each Other | Much larger (1 mi² = 640 ac) | Smaller unit |
| Equivalent Metric Unit | ≈ 2.59 square kilometers | ≈ 0.4047 hectares |
The conversion between square miles and acres is mathematically exact:
1 square mile = exactly 640 acres
1 acre = exactly 0.0015625 square miles
This is because an acre is legally defined as 1/640 of a square mile in both US customary and imperial measurement systems. There is no rounding or approximation involved, making the conversion 100% accurate for any calculation.
For reference with metric units:
1 square mile = 2.58998811 square kilometers (km²)
1 acre = 0.404685642 hectares (ha) = 4,046.85642 square meters (m²)
1 square kilometer = 0.386102 square miles = 247.105 acres
These metric conversions are approximate, unlike the exact relationship between square miles and acres. They're useful when working with international projects or scientific applications that use the metric system.
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