Square Foot (US Survey) to Are Converter
Unit Converter
Instant · Precise · Universal
23 units available
6 categories total
How to Convert Square Foot (US Survey) to Are
To convert US survey ft² to m²: multiply by 0.09290341. To international ft²: multiply by ~1.000004.
1 ft² (US) ≈ 0.09290341 m². Differs from international ft² (0.09290304 m²) by about 4 × 10⁻⁷ m².
For example, 1 Square Foot (US Survey) (ft² (US)) = 0.0009290341161 Are (a).
Square Foot (US Survey) to Are — Common Values
| Square Foot (US Survey) (ft² (US)) | Are (a) |
|---|---|
| 0.1 | 0.00009290341161 |
| 0.5 | 0.0004645170581 |
| 1 | 0.0009290341161 |
| 2 | 0.001858068232 |
| 5 | 0.004645170581 |
| 10 | 0.009290341161 |
| 25 | 0.0232258529 |
| 50 | 0.04645170581 |
| 100 | 0.09290341161 |
| 500 | 0.4645170581 |
| 1000 | 0.9290341161 |
About Square Foot (US Survey) (ft² (US))
Definition
The US survey square foot is a historical area unit based on the US survey foot (1200/3937 m), equal to approximately 0.09290341 m².
Mathematical Relationship
1 ft² (US) ≈ 0.09290341 m². Differs from international ft² (0.09290304 m²) by about 4 × 10⁻⁷ m².
Conversion Formula
To convert US survey ft² to m²: multiply by 0.09290341. To international ft²: multiply by ~1.000004.
Practical Applications
Historical property records and government land survey documents.
Interesting Facts
The difference from the international square foot is only about 0.4 mm² — negligible for a single measurement, but significant over millions of square feet.
Common Mistakes
Using the US survey foot in new work. Since 2023, only the international foot is valid in the US.
Educational Tips
The US survey foot existed because of a historical definition difference. It's now retired — use the international foot (exactly 0.3048 m).
About Are (a)
Definition
The are is a metric unit of area equal to 100 square meters — the area of a square with 10-meter sides.
Mathematical Relationship
1 a = 100 m² = 0.01 ha = 1 dam². 100 ares = 1 hectare.
Conversion Formula
To convert ares to m²: multiply by 100. To hectares: divide by 100. To acres: multiply by 0.0247.
Practical Applications
Small garden plots, residential lots in some European land records, and educational exercises.
Interesting Facts
The word 'hectare' literally means '100 ares.' Despite the are's obscurity, its derivative hectare is used worldwide.
Common Mistakes
Confusing 'are' with 'acre.' An are = 100 m², while an acre = 4,046.86 m² — an acre is about 40× larger.
Educational Tips
Remember: 1 are = 10 m × 10 m = 100 m². And 1 hectare = 100 ares = 10,000 m². The naming is systematic.