Acre (US Survey) to Square Dekameter Converter
Unit Converter
Instant · Precise · Universal
23 units available
6 categories total
How to Convert Acre (US Survey) to Square Dekameter
To convert US survey acres to m²: multiply by 4,046.873. To international acres: multiply by ~1.000004.
1 US survey acre ≈ 4,046.873 m². Differs from international acre (4,046.856 m²) by about 0.016 m².
For example, 1 Acre (US Survey) (ac (US)) = 40.4687261 Square Dekameter (dam²).
Acre (US Survey) to Square Dekameter — Common Values
| Acre (US Survey) (ac (US)) | Square Dekameter (dam²) |
|---|---|
| 0.1 | 4.04687261 |
| 0.5 | 20.23436305 |
| 1 | 40.4687261 |
| 2 | 80.9374522 |
| 5 | 202.3436305 |
| 10 | 404.687261 |
| 25 | 1011.718152 |
| 50 | 2023.436305 |
| 100 | 4046.87261 |
| 500 | 20234.36305 |
| 1000 | 40468.7261 |
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.
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.