Square Foot (US Survey) to Square Dekameter Converter
Unit Converter
Instant · Precise · Universal
23 units available
6 categories total
How to Convert Square Foot (US Survey) to Square Dekameter
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 Square Dekameter (dam²).
Square Foot (US Survey) to Square Dekameter — Common Values
| Square Foot (US Survey) (ft² (US)) | Square Dekameter (dam²) |
|---|---|
| 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 Square Dekameter (dam²)
Definition
The square dekameter is a metric unit of area equal to 100 square meters, also known as an 'are'.
Mathematical Relationship
1 dam² = 100 m² = 1 are = 0.01 ha = 0.001 hm².
Conversion Formula
To convert dam² to m²: multiply by 100. To hectares: divide by 100.
Practical Applications
Occasionally used for small land parcels in European property descriptions.
Interesting Facts
The 'are' is one of the few metric units that's almost completely obsolete — even the hectare (which means '100 ares') overshadowed it.
Common Mistakes
Confusing dam² (square dekameter, 100 m²) with dm² (square decimeter, 0.01 m²) — they differ by a factor of 10,000.
Educational Tips
Think: 1 are = 10 m × 10 m = 100 m². A hectare = 100 ares. The 'hect-' prefix means 100.