Convert area units — square meters, acres, hectares, square feet, square kilometers.
| Unit | Name | Value |
|---|---|---|
| m² | Square Meter | 1000000 |
| ha | Hectare | 100 |
| ac | Acre | 247.10516 |
| ft² | Square Foot | 10763915 |
| yd² | Square Yard | 1195990.6 |
| mi² | Square Mile | 0.38610188 |
Common square kilometer values converted to acre — factor: 1 km² = 247.1 ac
| Square Kilometer (km²) | Acre (ac) | Context |
|---|---|---|
| 0.1 km² | 24.71 ac | Town center |
| 0.25 km² | 61.78 ac | Small suburb |
| 0.5 km² | 123.6 ac | Small suburb |
| 1 km² | 247.1 ac | Suburb |
| 2 km² | 494.2 ac | Suburb |
| 5 km² | 1,236 ac | Small town |
| 10 km² | 2,471 ac | Large town |
| 20 km² | 4,942 ac | Large town |
| 25 km² | 6,178 ac | Small city |
| 50 km² | 1.236e+04 ac | Small city |
| 100 km² | 2.471e+04 ac | City |
| 250 km² | 6.178e+04 ac | Large city |
| 500 km² | 1.236e+05 ac | Large city |
| 1,000 km² | 2.471e+05 ac | Metro area |
| 5,000 km² | 1,236,000 ac | Small country |
Converting square kilometer to acre is common in real estate, agriculture, surveying, and construction. Property listings, land records, and planning documents often use different area units depending on the country or industry — making accurate conversion essential for cross-border transactions and international comparisons.
As a practical reference: 5 km² = 1236 acre and 10 km² = 2471 acre. For larger land areas, 100 km² = 2.471e+04 acre — a common benchmark for farm and estate valuations. The reverse: 1 ac = 0.004047 km².
All conversions use the internationally recognized factor of exactly 1 km² = 247.1 ac. Calculations are performed in IEEE 754 double-precision floating point, giving accuracy to at least 8 significant figures — more than sufficient for any practical application.
Formula: Acre = Square Kilometer × 247.10516
Multiply any square kilometer value by 247.10516 to get acre. One square kilometer equals 247.10516 ac.
Reverse: Square Kilometer = Acre × 0.00404686
1 km² = 247.10516 ac. Memorize this for instant mental estimates.
Use 247.1052 as a quick mental multiplier for square kilometers to acres.
To verify: multiply your result by 0.00404686 to recover the original km² value.
Measures and labels geographic features like lakes, forests, and countries in km².
Analyzes land use, population density, and territory size in square kilometers.
Reports national territory, protected area, and urban footprint in km².
Assesses metropolitan area growth and infrastructure needs in km².
Tracks deforestation, desertification, and habitat change in km².
Calculates wildfire, flood, or storm risk exposure over geographic areas in km².
The square kilometer is equal to one million square meters, used for measuring large geographic areas such as countries, forests, lakes, and urban regions.
It became the standard measure for national territories and natural features as cartography evolved in the 19th and 20th centuries alongside the metric system.
Interesting fact: The world's smallest country, Vatican City, covers just 0.44 km². Russia, the largest, spans about 17.1 million km².
The acre is a unit of land area equal to 43,560 square feet or about 4,047 m². Its origins trace to medieval England where it represented the amount of land an ox could plough in a day.
Acres remain the standard land measurement unit in the US, UK, Canada, and India for agriculture, real estate, and property transactions.
Interesting fact: A US football field (including end zones) is about 1.32 acres, and a typical suburban house plot in the US is roughly 0.2 acres.