Convert Square US Survey Foot to Square US Survey Mile
Convert square us survey feet to square us survey miles instantly. 1 square us survey foot = 3.587006e-8 square us survey mile — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square US Survey Mile to Square US Survey Foot converter for the reverse conversion.
Units explained
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
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 to Square US Survey Mile conversion formula
The relationship between square us survey feet and square us survey miles:
To convert square us survey feet to square us survey miles, multiply the value in square us survey feet by 3.587006e-8. To reverse, multiply square us survey miles by 2.78784e+7.
How to use this converter
Type a value into the calculator. The result in square us survey miles 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 Mile to Square US Survey Foot converter for the reverse direction.
Step-by-step: convert square us survey feet to square us survey miles
- Write down the value in square us survey feet (sft²).
- Multiply that value by the factor 3.587006e-8.
- The product is the equivalent value in square us survey miles (smi²).
- To reverse, multiply the square us survey mile value by 2.78784e+7.
Worked examples
Example 1 — Convert 1 sft² to smi²:
1 × 3.587006e-8 = 3.587006e-8 smi²
Example 2 — Convert 100 sft² to smi²:
100 × 3.587006e-8 = 3.587006e-6 smi²
Real-world example — Postcard and small-object dimensions
A postcard is about 5 square us survey feet wide. Converting to square us survey miles is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 sft² × 3.587006e-8 = 1.793503e-7 smi²
Real-world example — Ruler-scale measurements
A 30-square us survey foot school ruler converts cleanly to square us survey miles — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 sft² × 3.587006e-8 = 1.076102e-6 smi²
Real-world example — Hardware-scale dimensions
A 10-square us survey foot fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between square us survey feet and square us survey miles daily when mixing metric and imperial tools.
10 sft² × 3.587006e-8 = 3.587006e-7 smi²
Square US Survey Foot to Square US Survey Mile conversion table
Standard reference values for converting square us survey feet to square us survey miles:
| Square US Survey Foot [sft²] | Square US Survey Mile [smi²] |
|---|---|
| 0.01 | 3.587006e-10 |
| 0.1 | 3.587006e-9 |
| 1 | 3.587006e-8 |
| 2 | 7.174013e-8 |
| 3 | 1.076102e-7 |
| 4 | 1.434803e-7 |
| 5 | 1.793503e-7 |
| 10 | 3.587006e-7 |
| 20 | 7.174013e-7 |
| 30 | 1.076102e-6 |
| 40 | 1.434803e-6 |
| 50 | 1.793503e-6 |
| 100 | 3.587006e-6 |
| 500 | 1.793503e-5 |
| 1000 | 3.587006e-5 |
Frequently asked questions
How many square us survey miles is 1 square us survey foot?
How do I convert square us survey feet to square us survey miles?
How do I convert square us survey miles back to square us survey feet?
How many square us survey miles is 100 square us survey feet?
Popular area unit conversions
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Metric / SI (5 units)
Imperial / US Customary (3 units)
Sources & references
Conversion factor (1 sft² = 3.587006e-8 smi²) 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 Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.