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Conversion Formula:
Convert Rood to Square Kilometer (ro to km²) instantly with accurate, readable results.
Convert between square meters, acres, square feet, hectares, and other common units with our Area Unit Converter. This intuitive unit conversion tool helps you calculate land size, floor space, and surface area across both metric and imperial systems. Whether you're working on real estate, construction, or geography tasks, our area unit conversion calculator ensures precise and instant results.
Rood (rood) - traditional land area
Rood is a historical Imperial/US customary unit of area equal to one quarter of an acre. Used in older land records, field measurements, and some property descriptions.
- Symbol: none standardized (written as “rood”)
- System: Imperial/US customary (historic)
- Exact relations: 1 rood = 1/4 acre = 40 square rods (perches) = 2.5 square chains
- Other relations: 1 rood = 1 furlong × 1 rod = 10,890 ft² = 1,210 yd²
- Metric equivalents (exact): 1 rood = 1011.7141056 m²
- Typical examples: historical parcel sizes in deeds; subdivision remnants expressed as roods and perches
Square kilometer (km²) - large SI unit of area
Square kilometer is an SI unit of area equal to the area of a square with sides of 1 kilometer. Used for city sizes, land cover, and geographic mapping.
- Symbol: km²
- System: SI derived unit
- Exact relations: 1 km² = (1000 m)² = 1,000,000 m² = 100 ha = 10⁸ dm² = 10¹⁰ cm² = 10¹² mm²
- Imperial/US equivalents: 1 km² ≈ 0.386102159 mi² ≈ 247.105381 acres
- Typical examples: municipality areas, national park extents, watershed and habitat mapping