Convert Square US Survey Foot to Hectare
Convert square us survey feet to hectares instantly. 1 square us survey foot = 9.290341e-6 hectare — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Hectare 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.
Hectare
A hectare is a metric unit of area equal to 10,000 square meters, or one square hectometer. It is the most widely used metric unit for land measurement worldwide.
Defined as 100 ares, equal to one square hectometer. The name was introduced in 1795 in France as part of the metric system.
Hectares are the standard unit for agricultural land measurement worldwide except in the US (which uses acres). 1 hectare equals 2.47105 acres. In India, hectares are used in modern agricultural census and land records alongside traditional regional units.
Adopted in France in 1795; standardized internationally through the SI system.
Square US Survey Foot to Hectare conversion formula
The relationship between square us survey feet and hectares:
To convert square us survey feet to hectares, multiply the value in square us survey feet by 9.290341e-6. To reverse, multiply hectares by 107638.6736149054.
How to use this converter
Type a value into the calculator. The result in hectares updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Hectare to Square US Survey Foot converter for the reverse direction.
Step-by-step: convert square us survey feet to hectares
- Write down the value in square us survey feet (sft²).
- Multiply that value by the factor 9.290341e-6.
- The product is the equivalent value in hectares (ha).
- To reverse, multiply the hectare value by 107638.6736149054.
Worked examples
Example 1 — Convert 1 sft² to ha:
1 × 9.290341e-6 = 9.290341e-6 ha
Example 2 — Convert 100 sft² to ha:
100 × 9.290341e-6 = 0.0009290341 ha
Real-world example — Architectural to geographic scale
A 100,000-square us survey foot measurement equals one hectare. The five-order-of-magnitude scale change comes up in mapping work where architectural site plans must be related to road-network maps.
100000 sft² × 9.290341e-6 = 0.9290341161 ha
Real-world example — Small to geographic-scale
100,000 square us survey feet equals one hectare — a useful conversion when small-scale survey diagrams must be related to road-network distances on a different map.
100000 sft² × 9.290341e-6 = 0.9290341161 ha
Square US Survey Foot to Hectare conversion table
Standard reference values for converting square us survey feet to hectares:
| Square US Survey Foot [sft²] | Hectare [ha] |
|---|---|
| 0.01 | 9.290341e-8 |
| 0.1 | 9.290341e-7 |
| 1 | 9.290341e-6 |
| 2 | 1.858068e-5 |
| 3 | 2.787102e-5 |
| 4 | 3.716136e-5 |
| 5 | 4.645171e-5 |
| 10 | 9.290341e-5 |
| 20 | 0.0001858068 |
| 30 | 0.0002787102 |
| 40 | 0.0003716136 |
| 50 | 0.0004645171 |
| 100 | 0.0009290341 |
| 500 | 0.0046451706 |
| 1000 | 0.0092903412 |
Frequently asked questions
How many hectares is 1 square us survey foot?
How do I convert square us survey feet to hectares?
How do I convert hectares back to square us survey feet?
How many hectares 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 = 9.290341e-6 ha) 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.