Convert area units — square meters, acres, hectares, square feet, square kilometers.
| Unit | Name | Value |
|---|---|---|
| m² | Square Meter | 4046.86 |
| km² | Square Kilometer | 0.00404686 |
| ha | Hectare | 0.404686 |
| ft² | Square Foot | 43560.057 |
| yd² | Square Yard | 4840.0064 |
| mi² | Square Mile | 0.0015625002 |
Common acre values converted to hectare — factor: 1 ac = 0.4047 ha
| Acre (ac) | Hectare (ha) | Context |
|---|---|---|
| 0.01 ac | 0.004047 ha | Large garden |
| 0.1 ac | 0.04047 ha | Suburban lot |
| 0.25 ac | 0.1012 ha | Quarter acre lot |
| 0.5 ac | 0.2023 ha | Half acre |
| 1 ac | 0.4047 ha | Football field |
| 2 ac | 0.8094 ha | City block |
| 5 ac | 2.023 ha | Small farm |
| 10 ac | 4.047 ha | Medium farm |
| 25 ac | 10.12 ha | Large farm |
| 50 ac | 20.23 ha | Small ranch |
| 100 ac | 40.47 ha | Medium ranch |
| 250 ac | 101.2 ha | Large ranch |
| 500 ac | 202.3 ha | Large estate |
| 640 ac | 259 ha | Square mile |
| 1,000 ac | 404.7 ha | Large ranch |
Converting acre to hectare 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 ac = 2.023 hectare and 10 ac = 4.047 hectare. For larger land areas, 100 ac = 40.47 hectare — a common benchmark for farm and estate valuations. The reverse: 1 ha = 2.471 ac.
All conversions use the internationally recognized factor of exactly 1 ac = 0.4047 ha. 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: Hectare = Acre × 0.404686
Multiply any acre value by 0.404686 to get hectare. One acre equals 0.404686 ha.
Reverse: Acre = Hectare × 2.4710516
Acres × 0.4047 = hectares. Round to × 0.4 for rough estimates (1.2% low).
Two and a half acres is approximately one hectare — easy mental anchor.
ha × 2.471 = acres. Round to × 2.5 for quick estimates.
Measures crop fields and pasture in acres for planting, yield, and subsidy calculations.
Lists rural and suburban land parcels in acres for US and UK property transactions.
Measures and certifies plot areas in acres for legal property registration.
Assesses collateral value of farmland and rural property quoted in acres.
Allocates land parcels for development, conservation, or infrastructure in acres.
Converts acres to local Indian units like bigha, cent, or guntha for local transactions.
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.
The hectare is a metric unit equal to 10,000 m² or 2.471 acres, defined in 1795 as part of the French metric system. The name comes from the Latin area and the Greek hekaton (hundred).
Hectares are the global standard for agricultural land measurement, forest inventories, nature reserves, and urban planning across metric countries.
Interesting fact: One hectare of wheat can produce about 3-8 tonnes of grain. The Amazon rainforest covers roughly 550 million hectares.