Square Dekameter to Acre (US Survey) Converter
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How to Convert Square Dekameter to Acre (US Survey)
To convert dam² to m²: multiply by 100. To hectares: divide by 100.
1 dam² = 100 m² = 1 are = 0.01 ha = 0.001 hm².
For example, 1 Square Dekameter (dam²) = 0.0247104393 Acre (US Survey) (ac (US)).
Square Dekameter to Acre (US Survey) — Common Values
| Square Dekameter (dam²) | Acre (US Survey) (ac (US)) |
|---|---|
| 0.1 | 0.00247104393 |
| 0.5 | 0.01235521965 |
| 1 | 0.0247104393 |
| 2 | 0.04942087861 |
| 5 | 0.1235521965 |
| 10 | 0.247104393 |
| 25 | 0.6177609826 |
| 50 | 1.235521965 |
| 100 | 2.47104393 |
| 500 | 12.35521965 |
| 1000 | 24.7104393 |
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.
About Acre (US Survey) (ac (US))
Definition
The US survey acre is a historical unit of area based on the US survey foot, equal to approximately 4,046.873 m².
Mathematical Relationship
1 US survey acre ≈ 4,046.873 m². Differs from international acre (4,046.856 m²) by about 0.016 m².
Conversion Formula
To convert US survey acres to m²: multiply by 4,046.873. To international acres: multiply by ~1.000004.
Practical Applications
Historical US land surveys, old property deeds, and State Plane Coordinate System calculations.
Interesting Facts
The difference between US survey and international acre is about 0.016 m² — roughly the area of a sheet of paper. Over large areas, it adds up.
Common Mistakes
Using US survey acre in new calculations — it's been deprecated since 2023. Use the international acre instead.
Educational Tips
As of 2023, the US survey foot and acre are retired. All US measurements now use the international definitions.