Convert Square US Survey Mile to Square US Survey Foot
Convert square us survey miles to square us survey feet instantly. 1 square us survey mile = 2.78784e+7 square us survey foot — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square US Survey Foot to Square US Survey Mile converter for the reverse conversion.
Units explained
Square US Survey Mile
A square US survey mile is approximately 2,589,998 m², slightly larger than the international square mile.
Derived by squaring the US survey mile (5280 US survey feet).
Square US survey miles appear in older US Public Land Survey System records and state plane coordinate systems pre-dating 2023.
Defined in 1893; retired January 2023.
Square US Survey Foot
A square US survey foot is a unit of area equal to approximately 0.0929034116 m². It is slightly larger than the square international foot due to historical surveying definitions.
Derived by squaring the US survey foot, which was defined as exactly 1200/3937 meter from 1893 to 2023. This produced a value about 2 parts per million larger than the international foot.
Square US survey feet appear in legacy US public land records and state plane coordinate systems established before 2023. The US officially retired the survey foot effective January 1, 2023.
Defined in 1893; officially retired January 2023, but legacy records remain.
Square US Survey Mile to Square US Survey Foot conversion formula
The relationship between square us survey miles and square us survey feet:
To convert square us survey miles to square us survey feet, multiply the value in square us survey miles by 2.78784e+7. To reverse, multiply square us survey feet by 3.587006e-8.
How to use this converter
Type a value into the calculator. The result in square us survey feet updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Square US Survey Foot to Square US Survey Mile converter for the reverse direction.
Step-by-step: convert square us survey miles to square us survey feet
- Write down the value in square us survey miles (smi²).
- Multiply that value by the factor 2.78784e+7.
- The product is the equivalent value in square us survey feet (sft²).
- To reverse, multiply the square us survey foot value by 3.587006e-8.
Worked examples
Example 1 — Convert 1 smi² to sft²:
1 × 2.78784e+7 = 2.78784e+7 sft²
Example 2 — Convert 100 smi² to sft²:
100 × 2.78784e+7 = 2.78784e+9 sft²
Square US Survey Mile to Square US Survey Foot conversion table
Standard reference values for converting square us survey miles to square us survey feet:
| Square US Survey Mile [smi²] | Square US Survey Foot [sft²] |
|---|---|
| 0.01 | 278783.9999754343 |
| 0.1 | 2787839.9997543432 |
| 1 | 2.78784e+7 |
| 2 | 5.57568e+7 |
| 3 | 8.36352e+7 |
| 4 | 1.115136e+8 |
| 5 | 1.39392e+8 |
| 10 | 2.78784e+8 |
| 20 | 5.57568e+8 |
| 30 | 8.36352e+8 |
| 40 | 1.115136e+9 |
| 50 | 1.39392e+9 |
| 100 | 2.78784e+9 |
| 500 | 1.39392e+10 |
| 1000 | 2.78784e+10 |
Frequently asked questions
How many square us survey feet is 1 square us survey mile?
How do I convert square us survey miles to square us survey feet?
How do I convert square us survey feet back to square us survey miles?
How many square us survey feet is 100 square us survey miles?
Popular area unit conversions
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Metric / SI (5 units)
Imperial / US Customary (3 units)
Sources & references
Conversion factor (1 smi² = 2.78784e+7 sft²) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.